phutro
Newbie
Hullo all! Just made the leap to an RF system (Bessa R4A) and had a question about the 12mm. I know it vingettes, but would placing a UV filter on it (protection purposes) cause even more? Anyone have any idea / examples?
Regards,
Regards,
stompyq
Well-known
which version of the 12mm?
phutro
Newbie
The new m-mount.
Tom A
RFF Sponsor
You need the 67mm filter and if would not add to the vignetting. It is a 12 mm lens and it has edge fall off - though far less than one expects. If you want to correct for it -you need a filter with a graduated center spot to compensate (probably cost almost as much as the lens!!!!). I have tried it and found it useless. The edge darkening is remarkably modest for a lens with a 127 degree coverage!
If you scan your images - there are programs that can assist in minimizing vignetting - though I have never bothered to use them. The view of a 12 is dramatic enough that the slight vignetting actually helps "centering" the image.
If you scan your images - there are programs that can assist in minimizing vignetting - though I have never bothered to use them. The view of a 12 is dramatic enough that the slight vignetting actually helps "centering" the image.
phutro
Newbie
Thank you!
bigeye
Well-known
Ultra-wides suffer from natural vignetting or fall off from the radical bending of light - can't get away from it, except with a 'center filter' which has a graduated ND spot in its center to balance light values with the darker corners.
Mechanical vignetting is the obstruction of coverage by a filter or hood, a bit different.
The ever handy Ken Rockwell covers it here (scroll down). I agree with him too, I don't bother with it.
- Charlie
Mechanical vignetting is the obstruction of coverage by a filter or hood, a bit different.
The ever handy Ken Rockwell covers it here (scroll down). I agree with him too, I don't bother with it.
- Charlie
Last edited: