Hi all,
I have a lens (Nikon AF-S DX 16-80 mm zoom) that is not supported by
lensfun, and I thought this is the perfect opportunity to give back to the
project by contributing calibration data! I want to make sure the
information I provide is accurate and useful, so I have a few questions.
I performed distortion correction using the Hugin tool, and the results are
pretty good.
For Vignetting correction, I read Torsten's instructions here:
http://wilson.bronger.org/lens_calibration_tutorial/
What is a good, low-cost diffuser material? I considered wax paper, but it
has a definite texture, and I would have to purchase some flat glass to
support it. At that point, is it worth purchasing some optical milk glass
like this?
http://www.edmundoptics.com/optics/windows-diffusers/optical-diffusers/opal-diffusing-glass/46637/
The instructions say it must not be thicker than 3 mm, and that glass is 5
mm.
How even does the even illumination need to be? If I have a suitable
diffuser, could I shoot an overcast sky for the vignetting? I am concerned
that if I point a standard floor lamp at the ceiling it will have a
distinct circular illumination pattern.
For TCA correction: I haven't found a good target for TCA. Does this
calibration need a regular geometry (like the buildings used for
distortion?) Or are trees against an overcast sky ok?
Any suggestions are much appreciated!
-Owen
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