They do work great as a "protective' filter or you can just buy a clear filter.
To my knowledge there are no plain-glass "filters" offered in a mount.
Most non-chromogenic black and white film is sensitive to UV light and can benefit from UV filtration. The coatings and optical cements used in modern lenses absorb quite a bit of UV on their own, but from what I remember of Mamiya 7 lenses they tend to use relatively simple optical formulas. So especially at altitude, when on the beach, or when on the water I'd use a UV filter with such gear. I like the B+W 010 MRC filters for their brass filter rings, but there are a quite a number of other multicoated UV filters which will work fine as well.
Any "legit" UV filter will also absorb some visible light in the violet range, so with more complex lenses or daylight balanced color film other than Velvia 50 a clear filter is fractionally better.
Oops, even made by B&W.
I see nothing of that kind in my printed catalogues, must be something recent. Thank you!
I use a UV/Haze filter all the time. When you don't need it, it does little to help, but when you do need it, it is there and ready to go. Also, I have saved lenses twice by having that protection on the front.
PE
This is done by UV filter overcoats on the film, and overcoats on the lenses.
As one goes up in altitude, the UV radiation becomes greater and greater until special UV filtration is needed. This is not mandatory under normal photographic use, but in aerial photography it is. Kodak makes a special UV filter set for such use.
HOWEVER, the protection offered by ANY filter is well worth the price. I use a UV or Haze filter all the time. I also often use the "shade" on my lens, extended for extra protection.
PE
Should you elect to use a filter full time, I strongly recommend a multicoated one, which rules out any L39 or "Haze" filters I've seen marketed.
According to NOAA, UV light increases at about 4-5% per 1000 feet of altitude. So, yes, if you are shooting at altitudes where humans need supplementary oxygen to survive, a UV filter may help even with color negative film, but if you're using a zoom lens with lots of element groups you're still probably fine without one.
The never-ending debate about whether to use a protective filter has already consumed far too many electrons. I urge reader to make their own choice based on their subjective weighting of risks and benefits. Personally, I only use a protective filter under adverse environmental conditions. Should you elect to use a filter full time, I strongly recommend a multicoated one, which rules out any L39 or "Haze" filters I've seen marketed.
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