Hi Sebastian,
Thank you for adding the vignetting and TCA information. Where should I
check to see the earlier entry distortion calibration? The lists I can find
do not show this lens as being supported:
http://lensfun.sourceforge.net/lenslist/ and
http://wilson.bronger.org/lensfun_coverage.html (as of 2016-05-24).
Thanks,
Owen
On Fri, May 20, 2016 at 1:40 PM, Sebastian Kraft <[email protected]>
wrote:
> Hi Owen,
>
> there is already an entry for that lens in the current development version
> of the database where the distortion was measured for more focal lengths
> and seems to be a bit more detailed. Have you compared the distortion
> correction results with yours?
>
> However, vignetting and TCA is still missing and I will add your values to
> the database.
>
> Sebastian
>
>
> On 20.04.2016 16:02, Owen Mays wrote:
>
>> Hi all,
>>
>> I have attached a calibration file for the Nikon 16-80 mm lens. I
>> followed Torsten's tutorial here:
>> http://wilson.bronger.org/lens_calibration_tutorial/.
>>
>> The one issue I see is with the vignetting correction, it seems to
>> over-correct a ring between the center and the corners. The amount of
>> overcorrection is small. I measured it by taking the image into my raw
>> editor (darktable), turning on lens correction, and boosting the
>> exposure until the clipping indicators appeared (in a ring around the
>> center). I then turned off correction (the clipping indicators went
>> away), and boosted the exposure until I saw clipping again (this time in
>> the center).
>>
>> The difference between these two exposures was at most 0.14 EV (at 16
>> mm, where the strongest vignetting is). At longer focal lengths the
>> difference drops to 0.03-0.08. Probably not enough to worry about, and
>> certainly better than the 2+ stops of original vignetting.
>>
>> Let me know if there is anything else I should submit, or if there is
>> somewhere else I should upload the file for inclusion in the database.
>>
>> -Owen
>>
>>
>>
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