Hoya's previous HD series have been great. Especially HD3. I haven't tested the shock resistance (unless someone wants to buy me a sample to tryπ), but I have enough experience with a few other HD filters to confirm that they are more resistant to scratches, fingerprints and dust than other. I use. If it were just about optics, Nikon or B+W are just as good. Fingerprint and dust resistance is hard to come by until you've worked with it for a while - the stuff just doesn't stick! Modern digital cameras don't need UV filters, so crystal clear ones work too. I use them for lenses that I carry around all day without a cap. The purpose is to prevent contamination of the lens front element. I'm very careful, so impact protection is a low-risk issue - dust and dirt is a big concern for me. the cost of the protective filter and the risk of damage.
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