It doesn't like the sensor it seems:
In general I think you should post more sample images (or more often), but especially with a lens like this, images would be welcome (especially in regards to the reddish corners you mention)..
I'm trying to provide sample images for mainstream lenses but frankly I don't really want to spend extra efforts on exotics unless they're something special.
[quote name='WyldRage' timestamp='1312465034' post='10391']
Well, they would be useful to check if the measured vignetting might be linked to colour shift issues. I'm using a Voigtlander Ultron 28mm f2, and while the major issue is the vignetting, but there's also a light colour shift in the corners.
By the way, Sony seems to have improved their sensor performance with wide-angle rangefinder lenses on the Sony NEX-C3, according to this post: [url="http://www.fredmiranda.com/forum/topic/1030741/1#9793822"]http://www.fredmiran...30741/1#9793822[/url] It seems to have helped somewhat with the native E16mm lens, as seen here: [url="http://www.photoclubalpha.com/forum/viewtopic.php?p=58527#p58527"]http://www.photoclub...?p=58527#p58527[/url]
I can't wait to see if the NEX-7 will also continue on this path.
The color shift issue is there but it's nowhere as extreme as with the Voigtlander 12mm f/5.6 (of course). I've taken a few field image where you can spot traces.