On 2013-03-08 06:17, Pascal de Bruijn wrote:
> On Thu, Mar 7, 2013 at 8:52 AM, Russell Edwards <[email protected]> 
> wrote:
>>
>> I'm still confused about why darktable would apply a barrel 
>> distortion
>> correction when it doesn't recognise the camera or the lens, but 
>> won't apply
>> any correction when it recognises the camera but not the lens - even 
>> if you
>> tell it the camera is another one it previously knew about (K7 or 
>> generic).
>>
>> It's also odd that with that file in place, if I click the arrow at 
>> the end
>> of the camera selection line,I get two choices (K5 and K5-II) but if 
>> I click
>> the word "Pentax" on that line, I get the full menu. And then if I 
>> choose
>> something from that menu, suddenly K5 and K5-II aren't selectable 
>> any more.
>
> Without a sample file, to reproduce your problem, there is little I 
> can do...

OK - I have struggled to find a suitable way to make the files 
available while minimising my and your exposure to spam and malware.

I have just put two sample DNGs on Dropbox and shared it to your email 
address. That site does not appear to have the option to make files 
publicly available.

Let me know if there's a better way to do it.

IMGP0094.DNG is the one which prompted my original comments and 
questions

IMGP0161.DNG is another in which the EXIF records 0 for the focal 
length. The behaviour is similar but the correction applied when K7 is 
set as camera (and lens left as A series) creates a severe barrel 
distortion. Just another data point if that helps. By the way A series 
is an entire series of lenses so really it should not attempt a 
correction without knowing the actual lens model.

I am still trying to calibrate the lens. (Really not enjoying hugin's 
feature set in that aspect!)



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