>Nope - if you keep the filter on you have to clean only the front surface.
>Hoya HMC seems to work well with the 24-90 - no flare, no vignetting (which
>is a fancy word for light falloff).
Unfortunately, everytime switching filters (I hate to stack filters) would
expose them to air and those tiny dirt would just stick themselves on
without my permission. :< This is especially true when using filters in
the field (and usually in a hurry). And those HMC filters are not very flare
resistance either (to my standard anyway). I did recall from memory that
they had flare problem in more than a few occassions. I like HOYA filters
very much, but their HMC aren't as flare proof as SMC unfortunately (just
keep the Sun and strong light away will often solve the problem however).
regards,
Alan Chan
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