SkipD wrote:
How could even a filter touch the ground, much less the lens, if you were using a properly designed lens hood? Lens hoods should always be used for protection from stray light as well as mechanical contact with things.
I'm amazed at how many folks I see using filters to "protect" their lenses but don't even carry, much less use, lens hoods. That's why their filters get so buggered up with fingerprints, etc.
Well if I were laying on my belly (as I often do) and were using Nifty or my Sigma 28-90 the lens hood is rather short. If a rock or a blade of grass is tall and I tilt the camera then the rock or blade of grass could touch the filter, no? Now if I were shooting with my 70-200L then no the rock or blade of grass probaly would just touch the hood. Now, if I were standing in the middle of an AutoX course, and a car was say 20 or less feet from me and slung a rock, and I were using Nifty, Sigma or 17-40 the rock would hit the filter rather than the glass. I don't thing the hood would catch that. Now on the 70-200 the rock would have to take a pretty good aim to hit the hole but it could happen. Therefore I use a UV filter for protection. I also use CP filter to reduce glare.