The goal of the experiment #2 is to determine can we use a different camera with the same lens to achieve an accurate distortion preset?
The key idea is that Flange Distance for the same mount in all cameras is the same thus we can shoot distortion grids for lens preset on any camera that have enough sensor size.
For testing we selected three popular cameras featuring larger sensor sizes,
paired with the Supreme Prime 25mm lens using an LPL mount.
First, we positioned the RED camera precisely so the distortion grid covered the entire frame in Open Gate mode and captured the footage.
Next, we carefully measured the RED camera’s sensor position along all three axes and then placed the next camera’s sensor precisely in the same location before capturing footage in Open Gate mode.
We repeated the same exact procedure with our third camera.
Then, using our
CropDistortionGrid
, we cropped the grid footage from RED and ARRI to match Sony’s full sensor size, allowing us to compare results directly.
RED to Sony
ARRI to Sony
As you can see, differences in Angle of View between these cameras, when sensor areas are matched, are minimal. The slight discrepancies observed are mostly due to our practical limitations in positioning sensors precisely rather than actual flange distance variations.
This shows that each mount standard maintains a consistent flange distance across all compatible cameras, even when adapters are used.
This means, to shoot a distortion grid, we can safely choose any camera with a larger sensor size than the one used for our tracked footage. After capturing, we simply crop the grid footage to match the sensor dimensions of our main camera.
Also you can download distortion grids below for self checkup.
