Storm Chasing Workshop and Adventure May 23rd to May 30th. Come Join Me!!

Shooting a severe storm in Texas on a previous tour.
Shooting a severe storm in Texas on a previous tour.

Fancy something a bit different? Want a bit of excitement and adventure whilst learning new video and photography skills? Why not join me on this week long adventure workshop? Don’t forget as a training workshop this trip is tax deductable!

Departing early in the morning on the 23rd of May from Oklahoma City we will seek out some of the most breathtaking weather on the planet. Along the way I will share my skills and knowledge as I teach you to capture impressive images, whether video or stills. Late May is prime time tornado season in the USA.

SUPERCELLS: The most spectacular storms on the planet!

Dramatic Supercell Thunderstorm
Dramatic Supercell Thunderstorm

 

The storms that produce the Tornadoes are called “Supercells”. These are intense, long lived thunderstorms that can often look like scenes from sic-fi movies. We should see incredible landscapes and scenery, cloud formations that will amaze, incredible sunsets and if we are very lucky maybe a tornado or two.

Rainbow under a severe thunderstorm.
Rainbow under a severe thunderstorm.

Is it dangerous? Not as dangerous as it may appear on TV! These storms are incredibly powerful, but I am not out to get as close as possible to a tornado, nor am I interested in getting into any other un-necessarily dangerous situation. I have been chasing storms like these for over 12 years, I know how to stay out of trouble and the van will be equipped with both a satellite data system and a GPS and cellular data based storm tracking system. Using these I will know exactly where the most dangerous parts of the storms are and in fact tornadoes are actually quite predictable.

Equipment used for forecasting and storm tracking.
Equipment used for forecasting and storm tracking.

If a safe opportunity to approach a tornado presents itself then I will take advantage of this, but what I want is beautiful, jaw dropping images of the storms and storm structure. These take a couple of minutes to compose so I will often be hanging back a little to give us more time to get those once in a lifetime images. After dark I don’t like chasing barely visible tornadoes, instead I will find a good place a little way away from the storm to shoot the often incredible lightning that occurs.

What will you learn? As many of you may know I am an expert on camera setup and camera technology. I’m also a highly experienced documentary film shooter. I will happily pass on as much of that knowledge as you wish. I can teach good exposure, framing, picture profiles, log and raw shooting, editing, time-lapse and photography techniques. Why sit in a boring class room learning this stuff when you can have a real adventure at the same time. I find I always learn more about shooting techniques when the pressure is on!

A Supercell thunderstorm looking like a flying saucer.
A Supercell thunderstorm looking like a flying saucer.

Typically on day 1 I will teach basic framing and exposure with tips on how to prepare your camera for the scenes we are likely to encounter. Day 2 would be lesson on time-lapse techniques and methods. Day 3: We can look at raw and log formats and how to use them correctly. Day 4: Picture Profiles and advanced camera setups. Day 5: Documentary shooting tips, location sound and industry best practice. These are just some ideas, the tuition would be tailored to suit the needs of those in this small group.

Me, shooting a tornado for National Geographic.
Me, shooting a tornado for National Geographic.

Will we see storms? Well that is the big question. Unfortunately there is no guarantee that the weather will co-operate. However one reason this trip is being arranged and run last minute is because I have been keeping an eye on the weather trends and long term forecasts waiting for as best as I can see a good window of opportunity. Mid/Late May should be well into the storm and tornado season, this is the time of year when things are normally at their best. The global weather pattern that produced the surprisingly cold Spring is starting to break down and a much more typical late Spring pattern is on it’s way in the coming days. I would be very surprised if we don’t see storms on at least a couple of days, but I cannot guarantee anything. Typically for a storm chase in May I would expect to chase active strong to severe storms on 4 out of the 7 days. Down days are often needed to re-position for later active storm days and of course down days are days where we can have further tuition.

At night we shoot lightning!
At night we shoot lightning!

So what’s it going to cost? I try to make my courses and workshops as affordable as possible. This is no different, but there are many costs to be covered including vehicle hire, fuel, data and accommodation. The cost for this workshop is $1,900 USD per person. This includes a full week of tuition, motel accommodation between  check-in on May 22nd and departure on May 30th, and transport during the trip (starting and ending in Oklahoma City). It does NOT include any food or drink or your transport to the start and end point (Oklahoma City). Compare this to the cost of a typical Storm Chasing tour, that does not include video production tuition and you will see that this is remarkable value. If your coming to the US for this trip then do consider that the Cinegear Expo trade show at Paramount Studios takes place May 31st and June 1st.

If you wish to come please use the contact form to contact me ASAP. Places are very limited (5 places maximum) on this exclusive workshop. It will be fun, informative and an adventure.

 

Firmware Updates for Sony HDR-AS15 Action Cam.

Sony have released version 2.0 of the firmware for the Sony Action Cam along with updates for the Play Memories Software that is used to remotely connect to the camera via an iPad, iPhone or Android device. Click Here to go to the update page. Not a huge update by the looks of things. You get 1080p60 and new white balance settings for use underwater and the ability to turn the key press beeps off. No 25p or 24p sadly 🙁

More Details on the Convergent Design Odyssey Codecs and Pricing.

Convergent Design Odyssey7 Front.
Convergent Design Odyssey7 Front.

Following feedback from NAB Convergent Design decoded to make some changes to the pricing of the Odyssey7 and Odyssey 7Q. In case you haven’t already heard about these devices they are 7″ OLED monitors that also have the ability to record to onboard SSD’s. Originally the Odyssey units were not going to include any recording capability as standard. All the recording options were going to be paid for updates or available for short term rental. However Convergent Design have now decided to include the ability to record using Avid’s DNxHD codec within the original price of $1295 for the Odyssey 7 and  $2295 for the more advanced 7Q. There is however a small catch. In order to use the “free” codec options you must use a Convergent Design supplied SSD.

Waveform and measurement options on the Convergent Design Odyssey7Q
Waveform and measurement options on the Convergent Design Odyssey7Q

The Convergent Design SSD’s are more expensive than most off-the-shelf SSD’s but they are tested and certified to work with the Odyssey and some of the very fastest SSD’s available today.

Initially, this means that the Avid DNxHD codec, Avid DNxHD-36, -100, -145, -220 (8-Bit) and 220x (10-Bit) will be included). Advanced recording options such as Raw will now only be available on the 7Q.
Note: All prices are quoted as United States prices.
Prices around the world have to be different due to shipping, customs import fees, other taxes, and exchange rates.

Odyssey7 $1295 (US Price)

Avid DNxHD Recording Capabilities are enabled, for free,
upon insertion of a Convergent Design SSD.
No other recording options are offered at this time.
Initial Shipments of the Odyssey7 are planned for November 2013

Odyssey7Q $2295 (US Price)

Avid DNxHD Recording Capabilities are enabled, for free,
upon insertion of a Convergent Design SSD.
Additional recording options are available as described below.
Initial Shipments of the Odyssey7Q are planned for August 2013

High Performance Convergent Design SSD’s

240 GB $595 (US Price)
480 GB $1195 (US Price)
960 GB $2195 (US Price)

Odyssey 7Q Recording Options

FS700 Support: $1495, $75/day rental rate (US Prices)

HD/2K Raw up to 240fps (.dng format – Cinema DNG),
Quad HD/4K YCbCr Uncompressed up to 30 fps (.dpx format)
This option scheduled to be release in August, 2013.

Canon C500: $2495, $125/day rental rate (US Prices)

Quad HD/4K Raw 10-bit up to 60 fps,
Half QuadHD/Half 4K Raw 10-bit up to 120 fps (.rmf format);
Uncompressed HD/2K RGB 4:4:4 10/12-bit up to 60 fps (.dpx format);
DNxHD Compressed HD YCC 8/10-Bit up to 120 fps
(880 Mbps, .mov format).
Support for all C500 frame rates/modes for in one unit.
Some modes require two SSDs.
Simultaneous RAW and Proxy (DNxHD-36) up to 60 fps supported
(which is the limit of the camera’s monitor output)
This option scheduled to be release in August, 2013.

HD/2K High Frame Rate/RGB 4:4:4 $1495, $75/day rental rate (US Prices)

DNxHD Compressed HD YCbCr 8-Bit/10-Bit up to 120 fps
(up to 880 Mbps, .mov format)
Avid DNxHD-36, -100, -145, -220 (8-Bit), -220x (10-Bit)
Uncompressed HD/2K RGB 4:4:4 10/12-Bit up to 60 fps (.dpx format)
Also accepts 4:2:2 YCbCr and records in 4:4:4 RGB(.dpx format);

Quad HD/4K Support: $1495, $75/day rental rate (US Prices)

Uncompressed QHD/4K YCbCr 10-bit up to 30 fps (.dpx format).
For Sony F55 and other cameras that can output uncompressed 4K over four HD-SDI Single-Link Outputs.

HD/2K Raw: $2495, $125/day rental rate (US Prices)

HD and 2K Raw, up to 120 fps (.dng format – Cinema DNG).
Supports cameras from IO Industries, Lux Media Plan, Indiecam, Weisscam, P&S Technik X35

ALEXA ARRIRAW: $2995, $150/day rental rate (US Prices)

ARRIRAW (16:9 up to 60 fps, 4:3 up to 48 fps) with VariFrame and de-squeeze support (.ari format)
Simultaneous RAW and Proxy (DNxHD-36) up to 30 fps supported
(which is the limit of the camera’s monitor output)
This option scheduled to be released Q4 2013

Quad Stream HD Recording: $3995, $200/day rental rate (US Prices)

Supports recording up to four separate (Genlock not required)
video streams into four separate files using Avid DNxHD,
up to 1080p30/1080i60 or 720p60
(up to 220 Mbps/stream, .mov format).
The four HD streams may be displayed in separate quadrants on the OLED monitor and/or external monitor.
This option scheduled to be released Q4 2013.

Cine EI on the PMW-F5 and F55.

With the release of Firmware version 1.13 for the PMW-F5 and F55, Sony enabled the use of EI gain when shooting using the Cine EI mode. It’s a little unusual in that the EI gain only goes below the default/native gain and not above.

So what is EI gain and how do you use it?

EI or Exposure Index gain is a way of changing the gain of the monitoring outputs, but not the gain of the primary recordings. Currently with the F5 and F55 the signal seen on the HDSDI, HDMI output and viewfinder outputs are the same signals as recorded to the internal SxS cards, so EI gain is also added to the internal recordings. However EI gain is not added to the raw recordings recorded by the R5, these are always done at the native ISO of the camera, 1250ISO for the F55 and 2000ISO for the F5. The EI Gain is selected in the camera menu, it cannot be selected from the hot keys around the info LCD.

The F55 supports Exposure Index values (400EI/640EI/800EI/1250EI) in Cine-EI mode.

The F5 supports Exposure Index value (640EI/800EI/1250EI/2000EI) in Cine-EI mode.

So as we can see from above we can reduce the EI gain, not increase it (the F3 and most other cameras allow an increase in gain). What happens when we do this? Lets say we decrease the EI gain on an F5 to 800EI or 640EI on an F55, just a little over a one stop reduction. The image seen on the monitor or viewfinder screen gets darker. If your using a light meter to expose you would set your light meter to the new EI ISO.

If exposing according to that light meter, it would tell you to open the iris by a little over 1 stop. This would then return the brightness on the monitor or viewfinder back to where it was before you selected the new EI ISO. Now remember that the actual raw recording ISO does not change. So as you open up the iris (as that’s what the light meter or monitor image tells you to do) the raw recordings become brighter. With most conventional cameras this could be a problem as it might result in an overexposed image. But the F5 and F55 have so much dynamic range that for most typical scenes the exposure will still be OK. My experience with the F5 and F55 is that when shooting at the native ISO you normally have plenty of headroom. Raising the recording levels like this will allow more shadow and dark detail to be seen. So what you are doing is in effect shifting the cameras latitude down by just over one stop. Assuming your correctly exposed at the cameras native ISO you get +7 stops and -7stops, but now with the EI ISO set 1.25 stops lower, the dynamic range becomes +5.75 stops -8.25 stops. In addition as you will be bringing levels down in post production (compared to footage shot at the native ISO) you will end up this less noise in the final results.

So the current EI ISO settings on the F5 and F55 allows you to shift your exposure range down to produce a less noisy image with greater shadow latitude, but decreased highlight latitude.  Interestingly this is the opposite to the way EI ISO on the F3 works, the difference being due to the F5 and F55’s much higher dynamic ranges but more importantly the linear raw recording allowing for better use of the top end of the cameras dynamic range. A camera like the F3 that uses log recording cannot be significantly overexposed as the log compression of the highlights would cause problems with the brighter parts of the scene becoming excessively compressed. I would imagine that Sony will  include EI ISO settings that are higher than the native ISO in future firmware releases, but for the moment we can only go down.

 

New PMW-200 Firmware Release. V1.2.

The Sony firmware guy’s have been busy as they have also just released a firmware update for the PMW-200.

http://www.sony.co.uk/pro/support/software/SET_BPE-SS-1013/10

NEW FEATURES & IMPROVEMENTS:

1.) i.LINK DVCAM Input
Stream signal recording via i.LINK DVCAM input is available.
2.) Adjusting the Brightness of the EVF Screen
The default value of EVF has changed from ±0 to +30.
3.) Selecting AUDIO IN Reference Input Level
The default value of Audio Input has changed from -40 dB to -60 dB.
4.) External Device Connector
A message will be displayed if a USB device which is not supported by this unit has been connected.
5.) Auto Focus
Auto focus performance is improved. Focus instability near the focal point and with a high-luminance background has been reduced.
6.) Auto Knee
Auto Knee performance is improved. Emphasis of white for an object with a high-luminance background has been reduced.
7.) ATW
ATW performance is improved. When ATW mode is set to Natural, automatic adjustment for wider brightness range when shooting outdoors is available.
8.) Matrix Adjustment
Can be put on OFF in PICTURE PROFILE SET.

 

New Firmware for F5 and F55 V1.13.

Sony released a further firmware update for the F5 and F55 on Friday. Version 1.13 adds EI exposure index modes to the Cine EI mode and the ability to trigger the record start and stop from the Hirose 4 pin power ports. In addition LED 4 can be assigned as a record indicator and there are some improvements to the cameras noise reduction in standard modes.

http://community.sony.com/t5/F5-F55/NEW-Firmware-v1-13/m-p/120839#U120839

Large Sensor Film Makers Workshop. London, May 9th.

Booking and more information here: http://www.visuals.co.uk/events.php?event=eid4657

I’m running a one day intensive workshop for anyone looking at or working with large sensor cameras. If you are new to large sensor cameras or just want to know more about how to use them then this intensive one day workshop is for you. With a mixture of theory, practical demonstrations and hands-on sessions, I will guide you through every aspect of film making from lighting techniques to depth of field, gamma curves to RAW recording.

Throughout the day you will explore the benefits as well as some of the drawbacks of shooting with cameras that use APS-C and super35mm sized sensors, both from a practical point of view as well as a technical one. You will learn about how to manage your depth of field (DoF), whether you need a shallow DoF for a filmic look or a deeper DoF for easier shooting. There will be a session on lenses and lens adapters looking at the pro’s and con’s of using either DSLR lenses or PL mount lenses.

Then we will look at lighting, exploring the different types of lights available to the modern film maker and how to use them. We will spend time learning about contrast ratios and how to light and expose for a filmic look. In addition we will explain about the different types of gamma curves, log curves and raw recording methods used by these cameras. By combining the right lighting with the right gamma curve we will see how to maximise the performance available from these large sensor cameras. The day will end with a hands on practical session where we will put everything learnt into practice, setting up, lighting and shooting a test scene and then grading the footage shot.

Important
If you have your own camera then bring it along to use. If not, then, it doesn’t really matter as there will be cameras for you to try (minimum PMW-F5, PMW-F3, NEX-FS-700, Canon 550D, Sony NEX 5N). You will also be able to compare the images from both dedicated video cameras and DSLR’s.

This one-day workshop is a must for anyone interested in large sensor cameras and improving their film making techniques.

You will leave this session with:

  • Pros and cons of using cameras with large sensors
  • How to light and expose for a filmic look
  • Different types of gamma curves, log curves and raw recording methods
  • How to manage your depth of field
  • Techniques to maximise the performance of large sensor cameras
  • The pro’s and con’s of using lens adapters, DSLR and PL mount lenses
  • and much more…

Who should attend:
This Masterclass is suitable for anyone who is interested in learning how to get the best from a large sensor cameras or improve their film making techniques in general. Cinematographers, DoP’s, camera operators, freelancers, focus pullers.

What attendees say..

“It was a great day, Alister certainly knows his stuff and is a good presenter as well”
Bruna Fionda – Lighting Camerawoman 

“The rightful thanks entirely belong to Visual Impact for this superb opportunity to learn from the genius Aistair Chapman.”
Dhruv Gadhvi – Cameraman

“Just a quick note to say thanks for the Sony PMW-200 Masterclass…. It was not only great to learn more about the PMW200, but also to meet the other attendees.”
Steve Vousden – News Craft Coordinator, BBC Wales

“Thanks for organising the event at Teddington. It was enjoyable and interesting and helpful. A big thank you to all your staff who participated.”
Chris Morphet – Cameraman

“I really enjoyed the day found it so useful. All the staff we so friendly and informative.”
Tony Jones – Director- Lighting Cameraman/DoP/Editor/PD

The practicalities of fast run and gun shooting with a large sensor camera.

Supercell-panoramaWell I’ve just returned home from NAB and a week of Tornado Chasing in the USA. For the Tornado chasing I was shooting in 4K using my Sony F5. I’ve shot run and gun with my F3 and FS700 in the past when shooting air-shows and similar events. But this was very different. Tornado chasing is potentially dangerous. You often only have seconds  to grab a shot which involves leaping out of a car, quickly setting up a tripod and camera and then framing and exposing the shot. You often only have time for one 30 second shot before you have to jump back into the car and move on out ahead of the storm. All of this my be happening in very strong winds and rain. The storms I chased last week had inflow winds rushing into them at 50+ MPH.

The key to shooting any thing fast moving, like this, is having whatever camera kit your using well configured. You need to be able to find the crucial controls for exposure and focus quickly and easily. You need to have a way of measuring and judging exposure and focus accurately. In addition you need a zoom lens that will allow you to get the kinds of shots you need, there’s no time to swap lenses!

For my storm chasing shoot I used the Sony F5 with R5 recorder. This was fitted with a Micron bridge plate as well as a Micron top cheese plate and “Manhandle”. Instead of the Sony viewfinder I used an Alphatron viewfinder as this has a waveform display for exposure. My general purpose lens was a Sigma 18-200mm f3.5-f6.5 stabilised lens with a Canon mount. To control the iris I used a MTF Effect iris control box. For weather protection a CamRade F5/F55 Wetsuit. The tripod I used for this shoot was a Miller 15 head with a set of Carbon Fibre Solo legs.

Storm chasing with a PMW-F5
Storm chasing with a PMW-F5

Overall I was pleased with the way this setup worked. The F5’s ergonomics really help as the logical layout makes it simple to use. The 18-200mm lens is OK. I wish it was faster for shooting in low light but for the daytime and dusk shots, f3.5 (at the wide end) is OK. The F5 is so sensitive that it copes well even with this slow lens. The CamRade wetsuit is excellent. Plenty of clear windows so you can see the camera controls and a well tailored yet loose fit that allows you to get easy access to the camera controls. I’ve used Miller Solo legs before and when you need portability they can’t be beaten. The are not quite as stable as twin tube legged tripods, but for this role they are an excellent fit. The Miller 15 head was also just right. Not too big and bulky, not too small. The fluid motion of the head is really smooth.

Storm Chasing in the USA with the PMW-F5
Storm Chasing in the USA with the PMW-F5

So what didn’t work? Well I used the Element Technica Micron bridge plate. I really like the Micron bridge plate as it allows you to re-balance the camera on the tripod very quickly. But it’s not really designed for quick release, it’s a little tricky to line up the bridge plate with the dovetail so I ended up removing and re-fitting the camera via the tripod plate which again is not ideal. The Micron Bridge plate is not really designed for this type of application, when I go back storm chasing in May I’ll be using a  baseplate that locks into a VCT-14 quick release plate, not sure which one yet, so I have some investigating to do.  The VCT-14 is not nearly as stable or as solid as the Micron, but for this application speed is of the essence and I’m prepared to sacrifice a little bit of stability. The Micron bridge plate is better suited to film style shooting and in that role is fantastic, it’s just not the right tool for this job.

Rainbow under a severe thunderstorm.
Rainbow under a severe thunderstorm.

The MTF-Effect unit is needed to control the aperture of the Canon mount lens, it also powers the optical image stabiliser. But it’s a large square box. I had it mounted on the top of the camera, not in the best place. I need to look at where to mount the box. I’m actually considering re-housing the unit in a custom made hand grip so I can use it to hold the camera with my left hand and have iris control via a thumbwheel. I also want to power it from one of the camera’s auxiliary outputs rather than using the AA batteries internally. The other option is the more expensive Optitek lens mount which I’m hoping to try out soon.  I’m also getting a different lens. The Sigma was fine, but I’m going to get a Sigma 18-250mm (15x) f3.5-f6.5 for a bit more telephoto reach. The other option I could have used is my MTF B4 adapter and a 2/3″ broadcast zoom, but for 4K the Tamron will have better resolution than an HD lens. If I was just shooting HD then the broadcast lens would probably be the best option. After dark I swapped to my Sigma 24-70mm f2.8 for general purpose shooting and this worked well in low light but with the loss of telephoto reach, I need to look into a fast long lens but these tend to be expensive. If you have deep enough pockets the lens to get would probably be the Fujinon Cabrio 19-90 T2.9, but sadly at the moment my budget is blown and my pockets are just not that deep. The Cabrio is very similar to an ENG broadcast lens in that it has a servo zoom, but it’s PL mount and very high resolution. Another lens option would be the Canon CN-E30-105mm T2.8, but overall there isn’t a great deal of choice when it comes down to getting a big zoom range and large aperture at the same time, in a hand-held package. If I was working with a full crew then I would consider using a much larger lens like the Arri Alura 18-80 or Angenieux Optimo 24-290, but then this is no longer what I would consider run and gun and would require an assistant to set up the tripod while I bring out the camera.

A Supercell thunderstorm looking like a flying saucer.
A Supercell thunderstorm looking like a flying saucer.

From an operating point of view one thing I had to do was to keep reminding myself to double check focus. If you think focus is critical in HD, then it’s super critical for 4K. Thunderstorms are horrid things to try and focus on as they are low contrast and soft looking. I had to use a lot of peaking as well as the 1:1 pixel function of the Alphatron viewfinder, one of the neat things about the Alphatron is that peaking continues to work even in the 1:1 zoom mode. As I was shooting raw and using the cameras Cine EI mode to make exposure simpler I turned on the Look Up Tables on the HDSDI outputs and used the P1 LUT. I then exposed using the waveform monitor keeping my highlights (for example the brighter clouds) at or lower than 100%. On checking the raw footage back this looks to have worked well. Quite a few shots needed grading down by 1 to 1.5 stops, but this is not an issue as there is so much dynamic range that the highlights are still fine and you get a cleaner, less noisy image. When shooting raw with the F5 and F55 cameras I’d rather grade down than up. These cameras behave much more like  film cameras due to the massive dynamic range and raw recording, so a little bit of overexposure doesn’t hurt the images as it would when shooting with standard gammas or even log. Grading down (bringing levels down) results in lower noise and a cleaner image.

Frame grab from the F5 of a Supercell storm with a grey funnel cloud beneath.
Frame grab from the F5 of a Supercell storm with a grey funnel cloud beneath.

So you can run and gun in an intense fast moving environment with a large sensor camera. It’s not as easy as with a 2/3″ or 1/2″ camera. You have to take a little more time double checking your focus. The F5 is so sensitive that using a F3.5-F6.5 lens is not a huge  problem. A typical 1/2″ camera (EX1, PMW-200) is rated at about 300 ISO and has an f1.8 lens. The F5 in Cine EI mode is 2000 ISO, almost 3 stops more sensitive. So when you put an f3.5 lens on, the F5 ends up performing better in low light, even at f6.5 it’s only effectively one stop less sensitive. For this kind of subject matter you don’t want to be at f1.8 – f2.8 with a super 35mm sensor anyway as the storm scenes and shots involved work better with a deep focus range rather than a shallow one.

Having watched the footage from the shoot back in HD on a large screen monitor I am delighted with the quality of the footage. Even in HD it has better clarity than I have seen in any of my previous storm footage. This is I believe down to the use of a 4K sensor and the very low noise levels. I’d love to see the 4K material on a 4K monitor. It certainly looks good on my Mac’s retina display. Hopefully I’ll get back out on the plains and prairies of Tornado Alley later in May for some more storm chasing. Anyone want to join me?

 

Let the Storms Begin!

Tornado probabilities.
Tornado probabilities.

My facebook and twitter readers will already know that I’m in the USA doing a spot of storm chasing. The last few days have been a bit of a practice, chasing storms, jumping out of the car and getting the camera set up quickly (I’m shooting in 4K raw with the PMW-F5). I already have some really nice footage, but nothing spectacular yet, just some pretty scenic shots, some thunderstorms and a little bit of lightning. Today however looks to be a very interesting day. The Storm Prediction Center has issued a public advisory for severe weather including damaging winds, large hail and tornadoes. I’m right in the best place to catch some of the action and all set to go. However a tornado may only be 100m/100 yards across and the area where there is a 15% chance of tornadoes with 25 miles of a given point (a very high tornado probability) covers an area of about 50,000 square miles, that’s an area almost the size of the UK. So for the next couple of hours I will be looking at weather forecasting data and computer models trying to figure out exactly where to go.

There is a very serious risk of large and very violent tornadoes today across much of Oklahoma. The storms and tornadoes will be moving North East at about 25-35mph and possibly passing through some very heavily populated areas. In addition hail stones the size of tennis balls are expected along with straight line winds of up to 100 mph around some of the stronger storms. What’s going to cause all of this mayhem? Well the North of the US is currently sitting under some very cold winter air, it’s snowing about 300 miles north of here. Just to the south of me it’s hot, very hot and humid. High above strong jet stream winds are set to increase in strength today and dig down towards the south. As the jet stream digs south it will push that cold northern air south driving a cold front that will crash into the warm southern air. This cold front will push the warm air upwards and aided by the jet stream winds this creates atmospheric instability and lift that causes violent storms to break out along the front. The final ingredient is wind shear. Winds near the ground will be coming from the south towards the front while winds high above in the jet stream will be coming from the west. This will cause the stronger thunderstorms to start to spin and rotate which helps them to become much stronger turning them into “Supercells”. Supercell storms are responsible for almost all violent tornadoes.

So, wish me luck. Today will be a frantic and hectic day. Hopefully I’ll get some interesting 4K footage to share with you all very soon.

Canon online exposure tutorial and simulator. Great for beginners!

canon simulatorThis is a really neat online tutorial (http://www.canonoutsideofauto.ca) on exposure, aperture and shutter and how they work together to create different looks to a photo. There is also a clever simulation of what you pictures would look like if taken with different settings. This is great for kids, photography beginners or those that want to take better pictures but are not used to using manual modes.