FS7: What is the Actual FS7 Crop Factor?

[Joshua Milligan]

What is the actual crop factor of the Sony FS7? I've read where it's 1.5x like a Sony A7S in crop mode and I've also read where it's 1.39x like a normal Super 35mm would be. I'm just trying to figure out focal lengths of my lenses. For example, is my 70-200 on the FS7 actually running at 105-300mm, or is it really running at 97.3-278mm? And when you add a speed booster to it, what will it end up being? Thanks in advance for helping me clear this up!

 

[Ben Scott]

I know it's not too helpful, but the focal length of your lenses never changes. A 50mm is a 50mm is a 50mm. The crop and field of view might change but that is very different.

If I recall correctly an Arri Alexa and a Red Weapon aren't 'exactly' S35mm either and so I really wouldn't worry about it too much. I believe compared to Full Frame 35mm stills, the FS7 sensor is a 1.5 crop.

 

[Donny 123]

F5 is 24 x 12.7 (17-9) if the fs7 is exactly the same I'm not sure.. supposedly so.. APS C there are a couple of different sizes from different manufactures. 1.5 seems to be the commonly used crop factor full frame to F5/Fs7.. although 1.6 is more exact..

3 perf s35mm in 16-9 24.9 x 14
F5 in 16-9 22.6 x 12.7

Here is a good site from Abel ..

https://www.abelcine.com/fov/

 

[Bern Caughey]

I've read that using a 0.71x Focal Reducer (e.g. Speedbooster) on the FS7/5 equates to a 1.1x FOV crop when compared to FF35mm.