Manual Lens Distortion Correction

[Adam D'Agosto]

Hi.

I was able to find the automated lens filter correction which works great for my digital camera and lens. BUT, what I now need to to learn how to correct lens distortion manually. Can you do that?

Here's my problem....I'm shooting on a Nikon F100 (film) and using a lens that has a lot of distortion (28-300mm and others). Then, after I develop the film I "DSLR scan" the negatives using a 55mm macro lens. Works great! BUT, I cannot correct for the lens distortion using the automated filter.

I do however, have the distortion correction values from Ken Rockwell's site. Here is an example (random 70-300 f2.8 lens....)

Correction factor on 35mm and FX	3m (10')	infinity
70mm	+2.0	+3.0
85mm	+0.5	+1.0
105mm	-1.0	-0.5
135mm	-2.5	-2.3
200mm	-4.0	-3.0

Can these values be used to manually correct the image after I "DSLR scan" them? If so, how?

Many thanks!!

Adam

 

[Adam D'Agosto]

Actually, here are the exact numbers for the 28-300mm lens.

	FX and Film at infinity	FX and Film at 3m (10')	FX and Film at 0.9m (3')
28mm		+5.5*	+8.0*
35mm		-1.0*	-1.5
50mm		-4.25	-2.5
70mm		-4.5	-3.0
105mm		-4.0	-2.5
210mm**		-3.0	-2.0
300mm	-4.0	-3.0	-2.0

[walt.farrell]

I think you would need to create Lensfun files to do that correction. You might be able to figure out how to do that by following the instructions at https://lensfun.github.io/calibration/ but I've never tried it.