Did you ever have problems with reflections?
Whenever I used protective filters... I always got ghosted images of lights and other bright objects in my photos. Very annoying.
I was using relatively cheap filters... so maybe that was the problem. But you're still adding an additional piece of glass in front of the lens... so that's another surface for light to reflect off of.
I don't use those filters anymore... I'm just more careful with my cameras. No more ghosts!
The following pictures were from a Nikon D60 with a UV filter on the lens:
My camcorder was even worse. The UV filter was picking up reflections of overhead lights that weren't even in the frame!
Yep.... I was getting ghosting on 2 different cameras using 2 different UV filters under the same circumstances they discussed.
This has to do with low quality UV filters, specially if they came bundled... It happen to me, then, I found out, on dpreview, that cheap no name filters, don't have a no-mirroring coating, so what happends is light gets trapped between the lens and the filters causing ghosting.
For filters, hoya is the go to:
http://www.hoyafilter.com/ they are a bit more expensive but whats $20 on a $200+ lens