21mm Super-Elmar and Zeiss's offerings
This is not a 'which is sharper' request and speed is not issue here, but I'm looking to upgrade my 21mm CV with one of the above.
Currently I am shooting a project that I've called Empty Spaces and it involves taking photo's within derelict buildings with my M9p & 21mm CV.
The sample of CV lens I have is a little soft in the corners (although I do think its amazing considering what I paid for it), but what I'm struggling with is barrel distortion.
I know you can correct barrel distortion in PS, but I have found myself backed up against a wall and getting everything within a shot (just about!) and getting home and loosing the edges of the photo once its corrected.
Now, the immediate thought would be to go wider, but I've played with the Zeiss 18mm and it was just a bit too wide for my liking.
What is the barrel distortion like for these three lenses? I'm not very good with lens charts, so if someone could point out the differences please.
Am I correct in thinking that the Zeiss 4.5 would have the least, very shortly followed by the S-E, and the Zeiss 2.8 would be similar to my CV?
Lastly, I know 21mm is not the exact focal length of these lenses, but what is, and would the small focal difference make any difference.
PS, I plan to use Corner Fix if I go with the Zeiss 4.5