#Iphone 6 camera lens distortion software#

I concluded that it's probably not something one should worry about. Values up around 20 would be for things like fish eye lenses which wouldn't be appropriate for photographing fringes anyway. He tested other lenses and most were between -3 and 3. He tested the same lens I had and also got -0.5 for proper correction. There is this nice person on the internet who 'characterized' distortion for many lenses - he has lots of lens reviews. And this simulation is with 40X the distortion my camera has.

The second biggest change was in Y Astig which went from 0.075 to 0.065. The biggest difference was in X Coma which doubled from -0.027 to -0.057 waves. I processed the unaltered and photoshop distorted images in DFTFringe and there was not much difference. So I took an old igram of a parabolic mirror I own and purposely distorted it with +20 (40X worse than my lens). So my lens is 0.5 (unknown units) 'pin cushion'. Also I stopped down the image (as recommended by Bruce) at the same distance from camera lens to stop as would be found when photographing through the bath (long discussion elsewhere). Also I photographed it such that the pattern was the same distance from camera to mirror-under-test as from camera to test pattern. The test pattern was created by Dale's feature in DFTFringe but it's just a checkerboard pattern. My lens is corrected if I enter -0.5 in the 'remove distortion' box.

#Iphone 6 camera lens distortion software#

So I did some reading and tried some software but ended up doing something quite simple - took my grid photo and loaded it into photoshop and went to 'filter -> distort -> lens correction' and played around with keystone, rotation and distortion correction until I got the image perfect. I tried and gave up getting Dale's lens distortion analyzer to work - it's built into DFTFringe. Quick summary - don't worry about lens distortion.