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Question: Is this the Hoya HMC UV(0) or the Hoya HMC Super UV(0) 49mm filter made in Japan?  If it is not specifically one of these two, I do not want it.
Document: It's not what they claim it to be, a UV (0), it is in fact a UV (C) and there is a difference. It is still a quality Hoya HMC Multicoated UV filter, and had virtually no signs of wear even though it was listed as used. I am just a little disappointed that it wasn't a UV (0).
Recently purchased this through Amazon from eDirectPhoto Inc.  Just as a heads up you'll be getting the Hoya HMC "UV(C)" filter and not a "UV(0)" filter. Supposedly they are the same filter and the "C" version has replaced the original "0" version. Google it and you'll find more info if you're wondering.
See page 56 of this Hoya catalog: [...]The UV(O) filter is clearly more effective at attenuating wavelengths below about 425nm. The UV(C) filter kicks in at wavelengths below about 375nm. Frankly, with modern digital cameras, I wouldn't worry about this difference.I have read that the UV(O), which was made in Japan, is no longer available (except as new old stock). The UV(C) is made in the Philippines.
After scouring the web for UV filter reviews, I decided to buy the Hoya HMC. It was highly rated for resistance to flare when shooting into the sun. I'm very pleased with its performance, tho I always take it off when shooting into the sun, as no filter is totally immune from flare. I now keep Hoya HMC filters on all my lenses.
Excellent quality, coated filter. Appears to be well constructed an should last, unlike the cheap filter it replaces. I made the mistake of choosing a cheap haze filter, thinking that "its only  a piece of plain glass", which actually, it is, but if you buy the cheap filters that's all you get, a piece of glass in a cheap mount.This Hoya filter is also coated, and that really does make a difference, as does the well made mount.Well worth the money.
This is my 4th Hoya UV filter of different sizes. The quality is consistent. Price is reasonable. Good lens protection.
It is tough to b eat Hoya filters, and this one is no exception. 'Nuff said! Get one and protect your lens investments today!
Hoya filters are the best. High quality great fitting glass protector for everyday use. Don't leave your lens unprotected without one.
I've been pleased with all of them so far. Every time I get a new lens I get one of these mainly for scratch and dust protection. They are optically clear and are reasonably priced.
I have not taken many pictures with this filter yet but so far the ones I have taken have been greater than if I had not had the filter. Hoya is a good brand so I am comfortable knowing it's been around for awhile.
Answer: The one I bought was a 77mm and it was a "C". I'm pleased with the performance and if you Google around you can find test data where it scored quite nicely. http://www.lenstip.com/113.4-article-UV_filters_test_Description_of_the_results_and_summary.html