A lot of people like to shoot anamorphic with the FX3 or FX6. And they do get great looking images. The best example of this most recently is the blockbuster movie “The Creator” which was shot with an FX3 using 2x anamorphic lenses.

But there are a couple of things to consider with Anamorphic.

The first is what aspect ratios does the sensor support and what is the aspect ratio you want to deliver. The FX3 is always either 16:9 or 17:9 so that means that if you want you final output to have that classic 2.39:1 (2.40:1) aspect ratio then you need to use a 1.3x  anamorphic while shooting 16:9 as a 1.3x lens as this will allow you to use the full sensor.

If you use a 1.6x lens and do not crop the sides of the image in post you will have a much narrower 2.8:1 aspect ratio. 1.6x lenses work best with 3:2 sensors. With a 2x anamorphic lens you would end up with an extremely narrow 3.5:1 aspect ratio unless you do some serious side cropping – which will reduce the horizontal resolution of the final image. If you use a classic 2x anamorphic lens designed for 35mm film you will almost certainly have a noticeable vignette on either side of the frame as these lenses are designed for the narrow but tall frame of 35mm film. You are going to need to remove this vignette by cropping. If you only deliver in HD this may not be an issue, but for 4K delivery it means your footage is no longer really 4K. As a side note it is interesting that for “The Creator” this is exactly how they shot, using 2x anamorphics. But I am led to believe that extensive use of AI was made when scaling the image in post. If you do need to crop the image the FX9 has a bit of an advantage as the sensor operates at 6K in full frame, so the 4K recordings have higher resolution than the recordings from the FX3 or FX6 (remember a bayer sensor on actually resolves at about 75% of the pixel count, so a 4K sensor delivers a 3K image while a 6K sensor delivers a 4K image). Burano will be a good camera to use as even after you crop in to the 8K (pixel) image what is left will still be around 6K of pixels and full 4K resolution.

Then the other is de-squeeze. It can be quite challenging to focus if you have the wrong de-squeeze and if the collimation of the lens is off you may not notice that the horizontal and vertical focus points are different , so shots may not be as sharp as they should be. You could always use an external monitor with the de-squeeze you need.

So, depending on how you look at it the only lenses that might be considered to be “fully compatible” will be full frame 1.33x anamorphics as these will give the classic 2.40:1 aspect ratio without cropping and the camera supports 1.33x de-squeeze. But these are not common. Any other anamorphic squeeze ratio will require some post work. Classic 2x anamorphics were designed for super 35mm open gate 4:3 sensors and when used like this they still needed a slight side crop for 2.39:1. Use them on a FF 16:9 sensor and you will need to make a big side crop. For Full Frame anamorphic lenses these days it is common to use a 6:5 scan which is more square than 4:3 and the side crop is no longer needed. Additionally for FF, 1.8x squeeze is becoming very common and designed specifically  to work with a FF 6:5 sensor. But – sadly the FX3 doesn’t really have a scan mode tall enough to fully take advantage of modern FF anamorphics. But that doesn’t mean you can’t use them, it’s just not an ideal situation.

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