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:
...
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.
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.
f5.6
f8
f11
f16
Looks like the 12 has significantly less color shift than the 15. I believe the 15 has better edge/corner sharpness though... either way my CV12 is for sale now, too wide for my taste.
Dec 11, 2011 at 08:18 PM
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