Is there a way to manually calibrate the lens - trying to place points at the cross points of the checkers board?
If not, can i use calibration information from a different zoom? (I suspect not...)
Finally, I guess one other question. I have read that the automatic "calibration" when optomizing the camera positions is very good - so is it OK to not manually calibrate the lens?
The attempts I'm aware of - to manually calibrate a lens underwater using a chessboard - have proved unsuccessful.
Some observations:
Using a differing zoom to calibrate...will not ensure the path of light through the glass is consistent with the as-shot images used for reconstruction. Not recommended.
Metashape is very good with automatic calibration. There are some instances when manual calibration really pays off - we have provided consulting services to one massive civil engineering project client in North America on this - but the use case here sounds different.
ROV cameras can be a mixed bag...some good...some good at providing a visual feedback to the operator...but not all are going to deliver a result for photogrammetry.
So...some questions:
What camera is the lens attached to?
Are you shooting stills?
Or extracting frames from video?