Jacob D Offline Upload & Sell: Off
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alwang wrote:
So, as I had volunteered on the NEX Images thread, here are a series of test of vignetting and color shift of the Voigtlander 15/4.5 LTM on the NEX-5N. I believe Jacob D is going to try to do the same tests with the CV 12/5.6.
Quick recap of the methodology: I shot outside into a sunny sky with a white tissue paper stretched over the lens. ISO100, exposure comp at +2EV, aperture priority. I shot in raw, then in Lightroom, I white balanced using the center of the image, and then increased exposure to just before clipping. Here are the shots:
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I have to say, I'm surprised that this test showed as strong vignetting/color shift as it did. In actual practice of having shot this lens/camera combination for a couple of weeks, the problem rarely rears its head.
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Great! Thank you.
Here is the same with the CV 12/5.6. I had a helluva time with this because it kept picking up subtle textures in whatever I covered the lens with (hints of the same in the f16 example above with the CV12). In the end I found a piece of 1/4" UHMW (white, semi-opaque plastic) that I used.
f8 sample (difference at various apertures seems small)
http://farm8.staticflickr.com/7002/6507988815_5363b5d611_b.jpg
I edited this with change in method of generating the profile. Now shooting in aperture priority, ISO 100, +2 EV exposure comp, focus at infinity. Only adjustment in LR is WB at approx center of image.
Edited on Dec 13, 2011 at 07:25 PM · View previous versions
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