« on: November 03, 2012, 10:23:44 PM »
It would be interesting to hear reasons for their use on other lenses, beyond an abundance of caution.
I've taken my 70-300L down the beach a few times, to shoot surfers and things, the wind is always blowing a gale down there. Am I going to point my $1500 lens straight into the wind and have the front element sandblasted? Hell no, I point my B&W MRC filter into the wind, it only cost $60 or so, it has no measurable difference on IQ (as i tested on my 7D), and it's Multicoated so no extra flare in *normal* situations (i don't feel like testing it by pointing at the sun).
As to whether it's *needed* for weathersealing? Don't know, don't care. It can't make the sealing *worse*, and since it doesn't make the images worse either, then to me it's a no-brainer.
As for impact damage? Some people will claim that Hoods are better. They may be, it all depends on too many variables of height, floortype, angle, etc. Why not just use both? (And why not just don't drop it?) Hoods help a bit with less flare too. And if i dropped it i'd be more concerned about the IS elements rattling around and the mount breaking off the camera body than the outer elements smashing...
And when I am photographing jet engine tests, in high winds, or any other situation where I expect flying debris will hit the lens I use a protective filter as well.
But the question had become whether they were necessary to complete the weather sealing. Now I know that some of Canon's lens do require the additional piece be added (very disappointing of Nikon not to go to court; clearly they're off their game).
As for the filter that broke, I never said I dropped it. I didn't. I was walking through a doorway in NYC with the camera over my shoulder and got bumped into the door frame. The evilly designed Canon lens cap 'ear' got shoved into the filter and it shattered. Had the filter not been there, the cap ear could not have made it to the front element. Hence the protective filter cost me a lens. Unless you live in the countryside, such is an unavoidable risk if you actually carry your camera.
Come to think of it, I have become a hood guy these days. Never really thought about it until now...
You really should try shooting directly into the sun some time. The pictures that result can be quite beautiful. Although as you note, you might have to remove the filter to really get the best IQ out of the situation.