Tag Archives: viewfinder

Warning – it’s Sunburn Season (Northern Hemisphere at least).

Just a reminder to anyone using a viewfinder fitted with an eyepiece, magnifier or loupe not to leave it pointing up at the sun. Every year I see dozens of examples of burnt  and damaged LCD screens and OLED displays caused by sunlight entering the viewfinder eyepiece and getting focussed onto the screen and burning or melting it.

It can only take a few seconds for the damage to occur and it’s normally irreversible. Even walking from shot to shot with the camera viewfinder pointed towards the sky can be enough to do damage if the sun is out.

So be careful, cover or cap the viewfinder when you are not using it. Tilt it down when carrying the camera between locations or shots. Don’t turn to chat to someone else on set and leave the VF pointing at the sun. If you are shooting outside on a bright sunny day consider using a comfort shade such as an umbrella or large flag above your shooting position to keep both you and the camera out of the sun.

Damage to the viewfinder can appear as a smudge or dark patch on the screen that does not wipe off. If the cameras was left for a long period it may appear as a dark line across the image. You can also sometimes melt the surround to the LCD or OLED screen.

As well as the viewfinder don’t point your camera directly into the sun. Even an ND filter may not protect the sensor from damage as most regular ND filters allow the infra red wavelengths that do much of the damage straight through.  Shutter speed makes no difference to the amount of light hitting the sensor in a video camera, so even at a high shutter speed damage to the cameras sensor or internal ND’s can occur. So be careful when shooting into the sun. Use an IR ND filter and avoid shooting with the aperture wide open, especially with static shots such as time-lapse.

 

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Calibrating your viewfinder or LCD.

smpte-arib-bars-sample Calibrating your viewfinder or LCD.One of the most important things to do before you shoot anything is to make sure that any monitors, viewfinders or LCD panels are accurately calibrated. The majority of modern HD cameras have built in colour bars and these are ideal for checking your monitor. On most Sony cameras you have SMPTE ARIB colour bars like the ones in the image here. Note that I have raised the black level in the image so that you can see some of the key features more clearly. If your using a LCD or OLED monitor connected via HDSDI or HDMI then the main adjustments you will have are for Contrast, Brightness and Saturation.

First set up the monitor or viewfinder so that the 100% white square is shown as peak white on the monitor. This is done by increasing the contrast control until the white box stops getting brighter on the screen. Once it reaches maximum brightness, back the contrast level down until you can just perceive the tiniest of brightness changes on the screen.

Once this is set you now use the pluge bars to set up the black level. The pluge bars are the narrow near black bars that I’ve marked as -2% +2% and +4% in the picture they are each separated by black. The -2% bar is blacker than black so we should not be able to see this. Using the brightness control adjust the screen so that you can’t see the -2% bar but can just see the +2% bar. The 4% bar should also be visible separated from the 2% bar by black.

Color is harder to set accurately. Looking at the bars, the main upper bars are 75% bars so these are fully saturated, but only at 75% luma. The 4 coloured boxes, 2 on each side, two thirds of the way down the pattern are 100% fully saturated boxes. Using the outer 100% boxes increase the saturation or colour level until the color vibrance of the outer boxes stops increasing, then back the level down again until you just perceive the color decreasing. I find this easiest to see with the blue box.

Now you should have good, well saturated looking bars on you monitor or LCD and provided it is of reasonable quality it should be calibrated adequately well for judging exposure.

I find that on an EX or F3 the LCD panel ends up with the contrast at zero, colour at zero and brightness at about +28 on most cameras.

Alphatron EVF uses iPhone Retina Display Panel.

I am hoping to get time to play with the soon to be released Alphatron EVF at NAB. This new EVF boasts a range of pro features and a much higher resolution screen than currently available in the other low cost EVF’s on the market. To get good resolution TV-Logic scoured the world looking for a good, small LCD panel. Anyone with an iPhone 4 or 4s will know how good that display is and that’s the panel thats going in the new viewfinder. The panels resolution is 960×640, but the viewfinder will only use 960×540 pixels so you get easy 2:1 image scaling for 1920×1080 video. There is more information on the benefits of this simple 2:1 scaling on the Alphatron web site.

Cineroid HDSDI EVF Review.

cineroid-evf1-300x200 Cineroid HDSDI EVF Review.
Cineroid EVF-4MSS

I needed an external viewfinder for my F3 rig. I could have got either a Zacuto or Cineroid HDMI viewfinder, but I felt that HDSDI would be more useful. As the HDSDI  Zacuto is not available just yet, I picked up one of the new metal bodied Cineroid HDSDI EVF’s (EVF-4MSS).

The viewfinder has the same 800 x 480 pixel 3.2″ screen as the HDMI version but in a robust metal body. There are threaded 1/4″ mounting holes on the top and bottom of the viewfinder. It is supplied with a generic battery compatible with Sony’s L series batteries and a tiny little charger.

cineroid-evf3-300x195 Cineroid HDSDI EVF Review.
Rear of the Cineroid EVF-4MSS

So what’s it like. Well for a start it’s very solidly made. The body and the slide on part of the eyepiece is made from metal (some kind of hard anodised aluminium I think). The diopter adjuster is made out of plastic. On the rear of the body mine was fitted with an adapter for a Sony L series battery which has a short flying lead going to a high quality lemo connector for power. The battery adapter can be removed by unscrewing two small screws if you intend to power the finder from an external supply. The supply can be anywhere from 6 to 17 volts. There is also a pair of BNC’s for the  loop through HDSDI in and out connections.

cineroid-evf4-300x200 Cineroid HDSDI EVF Review.
Cineroid EVF with eyepiece flipped up and menus activated.

The eyepiece on the EVF flips up like most pro viewfinders, this allows you to see the screen directly, as an alternative you can slide the entire eyepiece assembly off completely, which turns the EVF into a tiny monitor. I have a slight issue with the slide off function as there is some light leakage along the top edge of the screen as a result. On a bright sunny day this is distracting as you can see it inside the finder. It’s easily solved with a small strip of electrical tape over the tiny gap, but you shouldn’t really need to do this. All Cineroid need to do is add a small lip to the top of the slide off assembly to fix this.

On powering up and using the finder for the first time I was pleasantly pleased. The screen is bright and clear and there is only the smallest amount of lag. When I showed the EVF to some of the visitors to the Sony booth at IBC there were many comments that this version has less lag than the HDMI version. My guess is that the HDMI processing in the camera plus the HDMI processing in the EVF adds up to a fair bit of a delay. This would appear to be much reduced with the HDSDI version.

f3-viewfinder-bracket-150x150 Cineroid HDSDI EVF Review.
Cineroid EVF on PMW-F3

Some people have complained that they can see the pixel structure of the screen in both the Cineroid and Zacuto EVF’s. I could just about make out the pixels, the screen appearing to have a slight texture, but in operation this has not caused me any issues. This EVF is a vast improvement over the EVF fitted to the back of the F3. Using either the Cineroid’s Peaking or 1:1 pixel mapping I can focus very accurately. Higher resolution would be nicer, but it is adequate as is. You have to consider that even the Sony HDVF20A that costs £3,000 only has around 600 lines of resolution. As well as peaking there are a number of other useful tools including the usual zebras. Some of the more unusual functions include a coloured clipping indicator and various false colour modes. I have to say that I have not been through all the different modes and functions yet. I’ve just been using it with peaking and zebras. You can have a full range of safe area overlays and there is the ability to work with anamorphic camera outputs, flip or mirror the picture. The peaking is adjustable and can be either white or red, I prefer red. A couple of different colours would be nice for when your shooting scenes that already have a lot of red in them. When you have it enabled (single button press) the up and down arrow buttons on the side of the EVF will adjust the peaking sensitivity up and down, so no need to go into the menu system.

Overall I am pleased with my Cineroid viewfinder. It does the job that I purchased it for and the price was quite reasonable (£799 + VAT). It’s compact and well constructed and looks like it will survive the inevitable knocks and bumps of everyday use.

PS. I was reminded by respected DoP Jody Eldred that the LCD panel in these (and many other) viewfinders is easily damaged if the sun starts shining into the eyepiece. The eyepiece acts as a magnifier and will focus the sun onto the LCD and burn it. The large size of the loupe on the Cineroid means that it doesn’t even need to be pointed directly at the sun for this to happen. So, when not in use, point the eyepiece down towards the ground, if your mount won’t allow you to do that easily, flip open the eyepiece. This is good practice with all monocular viewfinders. I’ve seen many scorched LCD’s and melted plastic interiors over the years.

PDW-700 or PDW-F800 viewfinder choice.

The PDW-700 and F800?s are sold body only, so you have to choose which viewfinder you want. there are 3 choices. A cheap HDVF 200 mono CRT finder that is 480+ lines resolution, the mid range (top of the CRT range) HDVF-20A which is 500+ lines resolution and then there is the expensive colour HDVF-C35W.?I got the HDVF-20A. The viewfinder is a critical part of the package and I wanted a good viewfinder. For the past year my main camera has been my trusty EX3 which I love. This has a really good colour viewfinder with an excellent colour peaking function and image magnification. When I use my EX3 it is rare for me to not get my pictures pin sharp and spot on in focus. Plus I can frame my image taking into account both black and white contrast range and colour contrast. With the EX3 judging exposure is easy, you can see when your overexposing as you can see colours washing out. If I don’t want (or can’t) take a colour monitor on location then I really can light an interview or check colour balance without just using the EX3?s finder.?Now with the PDW-700 I am struggling. Going back to a mono CRT has been a bit of a shock, to be honest I am struggling with it. It’s not that there is anything wrong with the HDVF-20A but I have become used to working with a colour VF. I’m not sure I can live with the CRT VF for very long. I guess I am going to have to start saving my pennies as I think going back to a mono CRT is a retrograde step. I just wish the C35W was a little cheaper. Perhaps Sony could bring out a VF for the 700/F800 based on the rather good EX3 finder.?If I was making the purchase again I would opt for the more expensive C35W. I no longer see a colour VF as a luxury but more of an essential item. When you work with cameras day in – day out you want the tools that make your life as easy as possible and a good colour VF is one of them. On it’s own the C35W may seem expensive at £5.5k compared to the £3.5k of the 20A, but in terms of the total packing it’s another 10% to the cost but in retrospect I think it would have been worth it.