Vignetting because of UV filters?

[rraman]

As per my understanding one should use thin circular polarizers on a wide angle lens to reduce vignetting. Could vignetting be a problem with UV filters as well?
There seems to be lot of price difference between thin/multicoated UV filters and those which are not categorized as thin filters. So I was just wondering if the price difference is worth it.

[mdude85]

realistically I can't see how it could make a difference. I have a standard Hoya 77 mm filter on a 19-35 mm and there is no problem with it.

[CoolToolGuy]

For full-frame lenses on a 'crop factor' camera this is a non-issue. The crop factor dials out any vignetting that would occur, even if 3 or so filters were used.

The EF-S lenses are another story. They are designed for a 1.6 crop factor, and they may not be able to handle as many filters. I have been using a UV and a C-POL on my EF-S 17-85 IS lens, and the jury is still out. They are on the slim side, but are not the thinnest available. I need to spend some time pixel peeping to be sure, but there is not any drastic effect - contrary to my original test which seemed to show some vignetting when viewed on the LCD.

Have Fun,

[Andy_T]

The vignetting will occur because the filter has a metal rim that elongates the rim of the lens.

If whatever you want to put in front of your lens has a rim of some sort, then it can cause vignetting, regardless of whether it is a filter, polarizer or else.

Thin filters have a thinner rim so that they do not intrude so far. If you stack 2 filters on top of each other (e.g. UV and polarizer), the chances for vignetting will increase.

As Cooltoolguy pointed out, the 1.6 crop factor gives you a 'margin' on full frame lenses (i.e. no EF-S lenses) because the image circle is actually bigger than what the camera uses.

This also means that a lens hood on a full frame lens will not work as designed on a digital body.

Best regards,
Andy