Roman, my limited lenses have Pentax SMC UV protective filters on them 
at all times. I notice no deterioration of image quality but I feel 
slightly better having invested *a lot* of money into these three lenses.

My other lenses are protected by Pentax UV protective filters (probably 
not SMC coated). Some lenses, notably cheaper zooms are not protected at 
all.

Finally, my Tamron 28-75/2.8 zoom came with B+W MRC coated UV protective 
filter.

All of the above filters are excellent, though on some extremely rare 
occasions they cause flare.

HTH.

Boris



Roman wrote:
> What protecting glass / UV filter brands do you use on DSLR.
> I've good experience with Sigma UV EX DG (for digital). Hoya UV Pro1 
> Digital I recently purchased had hard dirt stuck to the glass from the 
> inner side that has been contacting with porolone in the filter case, so 
> cleaned it with ethanol first, but the image passing through the glass 
> is good.
> 
> You?


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