I’m back with more PFTrack woes lol. So I have recently acquired a Canon 60D. I’ve been shooting most of my projects with this now, and have run into a lot of problems with tracking for reasons like rolling shutter and now some confusion over the right focal length. So I was wondering if someone could help clear out these questions for me.
So basically the 60D is not a full frame camera so all my lenses will have a crop factor of 1.6 on them. So a 50mm lens is equal to using an 80mm lens. My 60D has a film back of 22.3 × 14.9 mm according to the specs. When I try and enter this into PFTrack, it never lets me enter this ratio exactly. It always adjusts one value to be higher than it actually is by a few mm. I don’t know how much this affects my solve, but I assume not so much.
Another question is, if I shoot something with a 50mm lens on the camera, do I enter 50mm as the focal length or 80mm? Does PFTrack understand that the lens focal length is 55mm and my film back is not equal to a 35mm camera and so calculate crop factor and compensate or do I actually have to say 80mm in the approx focal length?
Another question is, how can I actually tell if rolling shutter is affecting my solve? I don’t see too much of it in my shot at present as opposed to some other videos that I’ve shot. What is the best way to post process footage with rolling shutter for the purpose of matchmoving?
Thanks guys!
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