Sadly this is not an uncommon problem. Suddenly and seemingly for no apparent reason the SDI output on your camera stops working. And this isn’t a new problem either, SDI ports have been failing ever since they were first introduced. This issue affect all types of SDI ports. But it is more likely with higher speed SDI ports such as 6G or 12G as they operate at higher frequencies and as a result the components used are more easily damaged as it is harder to protect them without degrading the high frequency performance.
Probably the most common cause of an SDI port failure is the use of the now near ubiquitous D-Tap cable to power accessories connected to the camera. The D-Tap connector is sadly shockingly crudely designed. Not only is it possible to plug in many of the cheaper ones the wrong way around but with a standard D-Tap plug there is no mechanism to ensure that the negative or “ground” connection of the D-Tap cable makes or breaks before the live connection. There is a however a special but much more expensive D-Tap connector available that includes electronic protection against this very issue – see: https://lentequip.com/products/safetap
Imagine for a moment you are using a monitor that’s connected to your cameras SDI port. You are powering the monitor via the D-Tap on the cameras battery as you always do and everything is working just fine. Then the battery has to be changed. To change the battery you have to unplug the D-Tap cable and as you pull the D-Tap out, the ground connection disconnects fractionally before the live connection. During that moment there is still positive power going to the monitor but because the ground on the D-Tap is now disconnected the only ground route back to the battery becomes via the SDI cable through the camera. For a fraction of a second the SDI cable becomes the power cable and that power surge blows the SDI driver chip.
After you have completed the battery swap, you turn everything back on and at first all appears good, but now you can’t get the SDI output to work. There’s no smoke, no burning smells, no obvious damage as it all happened in a tiny fraction of a second. The only symptom is a dead SDI.
And it’s not only D-Tap cables that can cause problems. A lot of the cheap DC barrel connectors have a center positive terminal that can connect before the outer barrel makes a good connection. There are many connectors where the positive can make before the negative.
It can also happen when powering the camera and monitor (or other SDI connected devices like a video transmitter) via separate mains adapters. The power outputs of most of the small, modern, generally plastic bodied switch mode type power adapters and chargers are not connected to ground. They have a positive and negative terminal that “floats” above ground at some unknown voltage. Each power supplies negative rail may be at a completely different voltage compared to ground. So again an SDI cable connected between two devices, powered by different power supplies will act as the ground between them and power may briefly flow down the SDI cable as the SDI cables ground brings both power supply negative rails to the same common voltage. Failures this way are less common, but do still occur.
For these reasons you should always connect all your power supplies, power cables and especially D-Tap or other DC power cables first. Then while everything remains switched off connect the SDI cables. Only when everything is connected should you turn anything on. If unplugging or re-plugging a monitor (or anything else for that matter) turn everything off first. Do not connect or disconnect anything while any of the equipment is on. Although to be honest the greatest risk is at the time you connect or disconnect any power cables such as when swapping a battery where you are using the D-Tap to power any accessories. So if changing batteries, switch EVERYTHING off first, then disconnect your SDI cables before disconnecting the D-Tap or other power cables next.
(NOTE: It’s been brought to my attention that Red recommend that after connecting the power, but before connecting any SDI cables you should turn on any monitors etc. If the monitor comes on OK, this is evidence that the power is correctly connected. There is certainly some merit to this. However this only indicates that there is some power to the monitor, it does not ensure that the ground connection is 100% OK or that the ground voltages at the camera and monitor are the same. By all means power the monitor up to check it has power, then I still recommend that you turn it off again before connecting the SDI).
The reason Arri talk about shielded power cables is because most shielded power cables use connectors such as Lemo or Hirose where the body of the connector is grounded to the cable shield. This helps ensure that when plugging the power cable in it is the ground connection that is made first and the power connection after. Then when unplugging the power breaks first and ground after. When using properly constructed shielded power cables with Lemo or Hirose connectors it is much less likely that these issues will occur (but not impossible).
Is this an SD fault? No, not really. The fault lies in the choice of power cables that allow the power to make before the ground or the ground to break before the power breaks. Or the fault is with power supplies that have poor or no ground connection. Additionally you can put it down to user error. I know I’m guilty of rushing to change a battery and pulling a D-Tap connector without first disconnecting the SDI on many occasions, but so far I’ve mostly gotten away with it (I have blown an SDI on one of my Convergent Design Odysseys).
If you are working with an assistant or as part of a larger crew do make sure that everyone on set knows not to plug or unplug power cables or SDI cables without checking that it’s OK to do so. How many of us have set up a camera, powered it up, got a picture in the viewfinder and then plugged an SDI cable between the camera and a monitor that doesn’t have a power connection yet or already on and plugged in to some other power supply? Don’t do it! Plug and unplug in the right order – ALL power cables and power supplies first, check power is going to the camera, check power is going to the monitor, then turn it all off first, finally plug in the SDI.
Scroll down to where it says “Stunning Cinematic Colour” and there you will find a video called “Orlaith” that shows both LUT’s applied to the same footage.
Orlaith is a gaelic name and it is pronounced “orla”. It is the name of a mythical golden princess. The short film was shot on a teeny-tiny budget in a single evening with an FX3 and FX6 using S-Log3 and SGamut3.cine. Then the LUTs were applied directly to the footage with no further grading.
No, it hasn’t been released yet. And it’s now not expected to arrive before the end of November. But it will be worth the wait.
We already knew about some of the new features but there is much more to this release than first announced. Let’s take a look:
Touch to focus, focus tracking: Yes, you heard it right. You will be able to use the touch sensitive LCD to touch on an object in the shot and then the camera will track that object as it moves around the shot. A box will appear around the touched object and you will be able to monitor what the AF is focussing on by looking at what the tracking box is over. This is a feature available on the A7S3 and FX3 that is VERY useful.
Anamorphic De-Squeeze. It will become much easier to shoot anamorphic with the FX9. When shooting Anamorphic the image produced by the lens is squeezed horizontally, and that’s what you record. But to monitor it correctly you then need to de-squeeze it by squashing it vertically by the correct amount. The V3 firmware update will allow the image to be squashed vertically (de-squeezed) for the LCD viewfinder so you can view with the included VF in the correct widescreen aspect ratio. Do note however that the SDI and HDMI outputs will NOT be de-squeezed, so to monitor externally you will need a monitor with de-squeeze, but most of them have this these days.
Super 16 Scan Modes: The camera will gain a 2K center scan mode that can be used to shoot at up to 180fps in full HD. Using the center scan mode for slow motion above 60fps will eliminate the aliasing issues currently seen when using the 2K FF or 2K S35 scan modes. Additionally you will be able to use Sony’s 2/3″ B4 lens adapter. When using the B4 adapter the camera will support ALAC which corrects for chromatic aberrations in lenses that support this feature.
Switch Scan Modes via Assignable Button: This has been something on everyone’s wish lists for years. Now at last you will be able to set up an assignable button to switch scan modes.
Add Camera ID and Reel Numbers to Clip Names: You will be able to use clip names that are prefixed by a camera ID number and a reel number similar to the clip naming system on the FS7.
Modify the Status Page List: This function allows you to remove pages from the status page menu. So you will be able to remove the pages you rarely use.
DC IN Alarm: Don’t get too excited just yet, but in V3 you will be able to set a low voltage alarm for the cameras DC input as well as the extension units DC input. This does NOT mean that there will be a low voltage warning with the current 3rd party V-Lock battery adapters as these convert the battery voltage to a fixed 19.5v supply that never changes. But it does mean that a clever manufacturer could now design a V-Lock adapter that could reduce it’s output voltage when the voltage of the V-Lock battery gets low allowing you to have an alarm in the camera before the battery cuts off.
Proxy Upload while recording: Currently you cannot upload proxies while recording. This will be improved in V3 and the camera will be able to upload proxies in the background while you are recording.
Zero Focus Distance function: When working with a lens that shows the focus distance on the LCD screen you will be able to focus on an object and then “zero” the focus distance. Then as you change the focus distance the the screen will display a +/- value that is how far from zero the focus is. You will be able to use this for a pull focus. Focus on the end object and set the focus distance to zero. Now focus on the start object. To pull focus turn the focus ring so you are back at zero again. Not actually sure how useful this will be, but hey – it isn’t costing us anything.
Change Network Settings via Mobile Phone App: You will be able to use a mobile phone to change the cameras network settings making it easier to enter addresses and passwords of FTP servers etc.
USB Phone tethering: you will be able to connect a couple of mobile phones to the camera via USB to use it them as modems for internet streaming (I believe this is via the USB ports on the top of the XDCA-FX9).
LCD Gamma Adjustments for SR Live: SR live is a type of HDR workflow developed for live productions that will be broadcast in both standard dynamic range and high dynamic range. This setting allows you to change the gamma of the LCD screen between SDR and HDR range when shooting using HLG in the HDR mode. This allows you to preview either what a viewer will see watching in SDR or a good approximation of what a viewer viewing in HDR will see.
S700 Remote Control: The camera will be able to be controlled remotely using s700 protocols (via ethernet).
A question poped up today asking about how to expose S-Cinetone when shooting green screen. The answer is really quite simple – no differently to how you would expose S-Cinetone anywhere else. But, having said that it is important to understand that S-Cinetone is a bit different to normal Rec-709 and this needs to be considered when shooting for chroma key or green screen.
S-Cinetone’s highlight roll off and shoulder starts much lower than most “normal” rec-709 curves. From around 73% the gamma curve changes and starts to compress the levels and reduce contrast. In the shdows there is a variable toe that increases contrast at lower brightness levels. The nominal “normal” brightness levels are also lower, all part of the contemporary film like look S-Cinetone is designed to give. A 90% reflectivity reference white card would be exposed at approx 83% instead of the more normal 90% (if you were using a light meter you should end up with a 90% white card at 83IRE). A white piece of paper will be a bit brighter than this as printer and copier paper etc is designed to look as bright as possible, typically printer paper comes out around 3 to 5% brighter than a proper white card.
The lower start to the highlight roll-off means that if you place skintones around 70% the brighter parts of a face will be affected by the rolloff and this will make them flatter. Expose skin tones at 60% and the face will be more contrasty and in my opinion look better. Although darker this would still be well with the “normal” exposure range for S-Cinetone so you will not have excessive noise and it will still key well.
S-Cinetone would be considered correctly exposed when a 90% white card is exposed between 78% and 88%. This is quite a wide window and is due to the way S-Cinetone is designed to give differening contrast levels simply by exposing a touch brighter or darker. The variable toe and shoulder mean that exposing brighter will make the image flatter and exposing darker more contrasty. Exposing as you would with normal Rec-709 levels with a white card at 90% will place skintones rather higher than “normal” and they will appear very flat. So either expose so a white card falls in the 78-88% window or use a calibrated monitor to observe how the skin tone look and be careful not to overexpose them.
Your greenscreen should be between 40IRE and 60IRE for a good clean key, I normally aim for 50IRE with S-Cinetone, but provided you don’t go below 40IRE or above 60IRE you should be good.
Most of sony’s cameras that support S-Log3 or Hybrid Log Gamma also have a function called Viewfinder Display Gamma Assist.
Viewfinder Display Gamma Assist allows you to monitor with the cameras built in LCD screen or viewfinder with the correct brightness and contrast range when using gamma curves that are not directly compatible with these Rec-709 screens.
Whenever you try to view a gamma curve that is not normal Rec-709 on a Rec-709 screen the brightness and contrast that you will see will be incorrect. The most common scenario is perhaps viewing S-Log3 without any form of LUT. In this case the images will look less bright and have less contrast than they should and this makes judging exposure difficult as well making it less easy to see focus errors.
With a camera like the FX6 or FX9 most people will use the cameras CineEI mode and add a LUT to the viewfinder image to convert the S-Log3 to something that looks more contrasty and on the FX6 and FX9 the default LUT is “s709”. However s709 is not the same thing as Rec-709 (Note that with the FX6, because LUTs are always available in the CineEI mode, viewfinder display gamma assist is not available in the CineEI mode of the FX6, you should instead use a LUT).
I think a lot of people think that the default s709 LUT is the same as Rec-709, it’s not, it is very different. They look very different and result in quite different brightness levels when exposed correctly. s709 when exposed correctly will put skin tones somewhere around 50-60% and white at 78%. If you expose s709 using normal Rec-709 brightness levels (70% skintones, 90% white) this is actually over exposed by just over 1 stop. As a result if you expose the s709 LUT, using Rec-709 levels, and then turn off the LUT and instead use Viewfinder Gamma Assist, the gamma assist will look wrong, it will be too bright and may look washed out and this is simply because the exposure IS wrong.
Almost always, if the viewfinder display gamma assist looks wrong, the exposure is wrong. When it looks right, the likelihood is the exposure is right.
A few things to understand:
The viewfinder is a Rec-709 range display device only capable of showing Rec-709 range and colour.
Feed true Rec-709 to a Rec-709 device and you will have a correct looking image with “normal” brightness, contrast and colour.
Feed S-Log3 to a Rec-709 device and you will have an incorrect dull, flat looking image due to the gamma miss-match between the capture gamma and display gamma.
Feed S-Log3 to a device with S-Log3 gamma and you will once again have the correct brightness and contrast as there is no longer a gamma miss-match (S-Log3 only appears to be flat due to the gamma missmatch between S-Log3 and Rec-709, use the right gamma and you will see that it is not actually flat).
Viewfinder Display Gamma Assist works by changing the gamma curve used in the Viewfinder to a gamma curve similar to S-Log3. When you view S-Log3 with a monitor with S-Log3 gamma you will have the correct contrast and brightness, so correct exposure will look correct.
But because the cameras LCD display screen can only show 6 to 7 stops you don’t get the full S-Log3 viewing range, just the central mid range part that is the direct equivalent of Rec-709. This very closely matches what you see if you use the Sony 709(800) LUT to convert the S-log3 to 709. The 709(800) LUT converts S-Log2 or S-Log3 to vanilla Rec-709 (70% skintones/90% white) with a knee that provides a slightly extended highlight range. It is broadly comparable to how most conventional Rec-709 cameras will look. So as a result viewfinder display gamma assist and Sony’s 709(800) LUT’s will look almost identical, while the s709 LUT will (and should by design) look different.
Viewfinder Display Gamma Assist is extremely useful for scenarios where you do not have a LUT option such as when shooting in CineEI in HD with the FX9. It can help you make good exposure assessments. It can make it easier to see when you are in focus. But it isn’t a LUT, so can’t be applied to the cameras outputs, only the built in viewfinder. Additionally if you use zebras, the waveform or histogram, gamma assist has no effect on these so you must remember that you are still measuring the levels of the actual recording gamma, not Rec-709 levels.
Viewfinder Gamma Assist is useful not only for shooting with S-Log but also when shooting using HLG (Hybrid Log Gamma). HLG is an HDR gamma curve and because the LCD viewfinder isn’t HDR you can’t correctly monitor HLG directly. Viewfinder Gamma Assist allows you to monitor with the correct brightness and contrast when shooting HLG making it easier to confidently get the correct exposure levels, as much like S-log3 the levels required for the correct exposure of HLG are quite different to Rec-709.
One last thing: NEVER use Viewfinder Gamma Assist with a LUT at the same time, this will result in a completely incorrect looking image and could result in very bad exposure as a result.
A few days ago Sony quietly released a new important firmware update for the PXW-FX9. Firmware version 2.10 adds the long awaited 4K 120fps raw function to the FX9 (you do still need the XDCA-FX9) but also importantly includes some change the the daylight white balance settings.
From my before and after testing it appears that a change has been made to the daylight white balance preset settings. For some time it has been apparent that if you used the white balance presets in the daylight range (4000K and higher) that the FX9 has a tendency to accentuate any green in the image. If you white balance of a white card this tendency is not there.
The new preset white balance settings now provide a much more neutral white balance with less green bias. This should also help those that were suffering from green fringing in extreme contrast shots as the reduced green bias will stop the camera from accentuating chromatic aberration as it did before. It won’t eliminate the chromatic aberration, but it won’t be nearly as obvious.
The first image was taken before doing the firmware update using a preset of 5500K. This test was done in a bit of a hurry as it was threatening to rain, but I wanted to use real daylight.
The second image, below, was taken after the firmware update (unfortunately the focus shifted slightly between the two shots, sorry). But you can clearly see that even though the white balance settings are the same and the same 5500K preset used this image is less green.
It is a subtle difference, but if you look at the wood panels you can see a difference. To help you see the difference here is a wipe between the before and after clips with the saturation boosted to make it more obvious.
As you can see this isn’t an “in your face” difference. But it is still none the less an important improvement as it makes it easier to match the FX9 to the FX6 and FX3 if you are using a preset white balance. I would still recommend white balancing off a white card for all cameras wherever possible as this will still normally provide the best results as it helps neutralise any lens or calibration differences. Whether you are shooting using S-Cinetone as in the examples here or using S-Log3, the new white balance preset provides in my opinion a much better colour response.
HOWEVER it’s important to consider that it will make cameras with version 2.10 and later look different to FX9’s with earlier firmware versions.
The firmware update can be downloaded via the link below. It took around 35 minutes for my FX9 to complete the update. The process is easy but when the camera gets to 80% complete it will appear that the update has stalled. It stays at 80% for around 10-15 minutes with no indication that the update is still continuing. So don’t turn the camera off thinking it’s stuck!!! Be patient and give it time to complete.
Sony today release an update covering many things. But of particular interest to FX9 and FX6 owners was news that both the FX6 and FX9 will get firmware updates to add 120fps raw. For the FX9 you will still need the XDCA-FX9 and to be honest this has always been promised, but it’s good to see it hasn’t been forgotten about. This update should be out next month.
In addition the FX9 will gain the ability to shoot Anamorphic in the version 3 firmware update which will be released later in the year. There will be both 1.3x and 2x anamorphic desqueeze as well as the addition cinemascope frame lines. This is on top of the previously announced 2K super 16mm sized center scan mode with support for B4 ENG lenses and s700PTP control over TCP/IP.
It’s no secret that the variable ND fitted to many Sony cameras does introduce a colour shift that changes depending on how much ND you use. But the cameras are setup to add an offset to the WB as you switch the ND in or out and change the amount of ND, so in practice most people are completely unaware of this shift.
If you watch carefully when you engage or disengage the ND you can sometimes see a fraction of a second where the cameras electronic offset that corrects for the shift is applied just as the filter comes in. Then once the filter is in place the colours appear completely normal again.
So when should you white balance from a white card? With or without the ND filter in place?
You can actually white balance either with or without the ND in place. Because the camera knows exactly what offset to apply for any ND value if you change the ND it will compensate automatically and generally the compensation is very accurate. So in most cases it doesn’t really matter whether the ND filter is in place or not.
However, my personal recommendation is where possible to white balance with the camera setup as it will be when you are taking your footage. This should then eliminate any small errors or differences that may creep in if you do change the ND or switch the ND in or out.
But I wouldn’t be too concerned if you do have to do a WB at one ND level and then change the ND for whatever reason. The in camera compensation is extremely good and you would only ever really be able to see any difference if you start doing careful like for like, side by side, split screen direct comparisons. It’s certainly highly unlikely that you or your audience would ever notice any difference in normal real world applications.
You will often see greater colour shifts if you add external ND filters or swap between different lenses, so treat the internal ND as you would any other ND filter and WB with your lens, filters and everything else as it will be when taking the footage. I think one of the truly remarkable things about the variable ND filter is just how consistent the output of the camera is across such a wide range of ND.
This is a very good question that came up in one of the F5/F55/FX9 facebook groups that I follow. The answers are also mostly relevant to users of the FX6, FX3 and the A7SIII.
There were two parts to it: Is the FX9’s raw out as good as the raw from the F5/F55 and then – do I really need raw.
In terms of image quality I don’t think there is any appreciable difference, going between the raw from an FX9 and the raw from an F5/F55 is a sideways step.
The F5/F55 with either Sony Raw or X-OCN offer great 16 bit linear raw in a Sony MXF package. The files are reasonably compact, especially if you are using the R7 and X-OCN. There are some compatibility issues however and you can’t use the Sony Raw/X-OCN in FCP-X and the implementation in Premier Pro is poor.
The 16 bit out from the FX9/XDCA-FX9 gets converted to 12 bit log raw by the Atomos recorders, currently the only recording options – but in reality you would be extremely hard pushed to really see any difference between 16 bit linear raw and 12 bit log raw from this level of camera.
Recording the 12 bit log raw as ProRes Raw means that you are tied to just FCP-X, Premiere Pro (poor implementation again) and Scratch. The quality of the images that can be stored in the 2 different raw formats is little different, 16 bit linear has more code values but distributed very inefficiently. 12 bit log raw has significantly fewer code values but the distribution is far more efficient. AXS media is very expensive, SSD’s are cheap. AXS card readers are expensive, SSD adapters are cheap. So there are cost implications.
Personally I feel the reduced noise levels from the FX9 makes footage from the FX9 more malleable than footage from the F5/F55 and if you are shooting in FF6K there is more detail in the recordings, even though they are downsampled to 4K raw. But the FF6K will have more rolling shutter compared to an F55/F5.
Working with Sony Raw/X-OCN in Resolve is delightfully easy, especially if you use ACES and it’s a proper grading package. If you want to work with ProResRaw in Resolve you will need to use Apple Compressor or FCP-X to create a demosaiced log file, which even if you use ProRes444 or XQ not the same as working from the original raw file. For me that’s the biggest let down. If I could take ProResRaw direct into Resolve I’d be very happy. But it is still perfectly possible to get great footage from ProResRaw by transcoding if you need to.
As to whether you need raw, only you can answer that fr yourself. There are many factors to consider. What’s your workflow, how are you delivering the content. Will the small benefit from shooting raw actually be visible to your clients?
Are you capturing great content – in which case raw may give you a little more, or are you capturing less than ideal material – in which case raw isn’t going to be a get out of jail card. Raw of any flavour works best when it’s properly exposed and captured well.
I would suggest anyone trying to figure out whether they need raw or not to start by to grading the XAVC-I from the FX9 and see how far you can push that, then compare it to the raw. I think may be surprised by how little difference there is, XAVC-I S-Log3 is highly gradable and if you can’t get the look you want from the XAVC-I raw isn’t going to be significantly different. It’s not that there is anything wrong with raw, not at all. But it does get rather over sold as a miracle format that will transform what you can do. It won’t perform those miracles, but if everything else has been done to the highest possible standards then raw does offer the very best that you can get from these cameras.
As a middle ground also consider non raw ProRes. Again the difference between that and XAVC-I is small, but it may be that whoever is doing the post production finds it easier to work with. And the best bit is there are no compatibility issues, it works everywhere.
But really my best recommendation is to test each workflow for yourself and draw your own conclusions. I think you will find the differences between each much smaller than you might assume. So then you will need to decide which works for you based on cost/effort/end result.
Sometimes best isn’t always best! Especially if you can get to where you need to be more easily as an easy workflow gives you more time to spend on making it look the way you want rather than fussing with conversions or poor grading software.
Can you tell which is genuine and which is fake? It would appear that a number of fake BP-U batteries are starting to show up on ebay and other less reputable places. The battery on the left won’t charge on a genuine Sony charger, this tells me it is not a real Sony battery.
If you look at the labels on the batteries the quality of the printing on the fake battery on the left is not as fine as on the genuine battery, in particular the ® as well as the box around the level indicator LED’s is not as crisply and finely printed.
The sellers are clever. These are not so cheap as to raise suspicion, they just seem very competitively priced. These batteries might be a little bit cheaper, but how safe are they and how long will they last? I have to say this would have fooled me and I have a lot of sympathy for others that have been tricked into buying these. But if the manufacturer can’t sell these by legitimate means under their own brand name I really do have to question their quality and safety.