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Can You Shoot Anamorphic with the PXW-FX9?

The simple answer as to whether you can shoot anamorphic on the FX9 or not, is no, you can’t. The FX9 certainly to start with, will not have an anamorphic mode and it’s unknown whether it ever will. I certainly wouldn’t count on it ever getting one (but who knows, perhaps if we keep asking for it we will get it).

But just because a camera doesn’t have a dedicated anamorphic mode it doesn’t mean you can’t shoot anamorphic. The main thing you won’t have is de-squeeze. So the image will be distorted and stretched in the viewfinder. But most external monitors now have anamorphic de-squeeze so this is not a huge deal and easy enough to work around.

1.3x or 2x Anamorphic?

With a 16:9 or 17:9 camera you can use 1.3x anamorphic lenses to get a 2:39 final image. So the FX9, like most 16:9 cameras will be suitable for use with 1.3x anamorphic lenses out of the box.

But for the full anamorphic effect you really want to shoot with 2x  anamorphic lenses. A 2x anamorphic lens will give your footage a much more interesting look than a 1.3x anamorphic. But if you want to produce the classic 2:39 aspect ratio normally associated with anamorphic lenses you need a 4:3 sensor rather than a 16:9 one.

What about Full Frame 16:9?

But -that’s super 35mm 4:3 or s35mm open gate. The FX9 has a 6K full frame sensor and a full frame sensor is bigger, most importantly it’s taller than s35mm and tall enough for use with a 2x s35 anamorphic lens! The FX9 sensor is approx 34mm wide and 19mm tall in FF6K mode.

In comparison the Arri  35mm 4:3 open gate sensor is area is 28mm x 18mm and we know this works very well with 2x Anamorphic lenses. The important bit here is the height – 18mm with the Arri open gate and 18.8mm for the FX9 in Full Frame Scan Mode.

Crunching the numbers.

If you do the maths – Start with the FX9 in FF mode and use a s35mm 2x anamorphic lens. 

Because the image is 6K subsampled to 4K the resulting recording will have 4K resolution.

But you will need to crop the sides of the final recording by roughly 30% to remove the left/right vignette caused by using an anamorphic lens designed for s35 on a full frame sensor (the exact amount of crop will depend on the lens). This then results in a 2.8K ish resolution image depending on how much you need to crop.

4K Bayer doesn’t won’t give 4K resolution.

That doesn’t seem very good until you consider that a 4K 4:3 bayer sensor will only yield about 2.8K resolution anyway.

And Arri’s s35mm cameras are open gate 3.2K bayer sensors so will result in an even lower resolution image, perhaps around 2.2K? Do remember that the original Arri ALEV sensor was designed when 2K was the norm for the cinema and HD TV was still new. The Arri super 35 cameras were for a long time the gold standard for Anamorphic. But now cameras like Sony’s Venice that can shoot the equivalent of 6K open gate or 6K 4:3 and 6:5 are now taking over.

What about Netflix?

While Netflix normally insist on a minimum of a sensor with 4K pixels horizontally for capture, they are permitting sensors with lower horizontal pixel counts to be used for anamorphic capture because the increased sensor height needed for 2x anamorphic means that there are more pixels vertically. The total pixel count when using a camera such as the Arri LF with a super 35mm 2x anamorphic lens is 3148 x 2636 pixels. Thats a total of  8 megapixels which is similar to the 8 megapixel total pixel count of a 4K 16:9 sensor. The argument is that the total captured picture information is similar for both, so both should (and are) allowed.

So could the FX9 get Netflix approval for 2x Anamorphic?

The FX9’s sensor has is 3168 pixel tall when shooting FF 16:9  as it’s pixel pitch is finer than the Arri LF sensor.  When working with a 2x anamorphic super 35mm lens the image circle from the lens will cover around 4K x 3K of pixels, a total of 12 megapixels on the sensor when it’s operating in the 6K Full Frame scan mode. But then the FX9 will internally down scale this to that vignetted 4K recording that needs to be cropped.

6K down to 4K means that the 4K covered by the lens becomes roughly 2.7K. But then the 3.1K from the Arri when debayered will more than likely be even less than this, perhaps only 2.1K

But whether Netflix will accept the in camera down conversion is a very big question. The maths indicates that  the resolution of the final output of the FX9 would be greater than that of the LF, even taking the necessary crop into account. But this would need to be tested in practice. If the math is right, I see no reason why the FX9 won’t be able to meet Netflix’s minimum requirements for 2x anamorphic production. If this is a workflow you wish to pursue I would recommend taking the 10 bit 4:2:2 HDMI out to a ProRes recorder and record using the best codec you can until the FX9 gains the ability to output raw. Meeting the Netflix standard is speculation on my part, perhaps it never will get accepted for anamorphic, but to answer the original question –

 – Can you shoot anamorphic with the FX9 – Absolutely, yes you can and the end result should be pretty good. But you’ll have to put up with a distorted image with the supplied viewfinder (for now at least).


Can You Shoot Anamorphic with the PXW-FX9? was first posted on October 3, 2019 at 10:57 am.
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