The SMC filters say SMC on them. I have a Pentax 49mm skylight that does not say SMC, and compared to an SMC there is a world of difference. Based on the reflectivity of the non-SMC Pentax and the Hoya, I wonder if they are even single coated.
Personally, I tend to avoid filters unless there is a compelling reason to use them. One thing that really surprised me though was the graph that came with the SMC skylight. I always thought that a skylight was a UV filter that extended some filtration into the blue end of the visible spectrum. Actually, according to the documentation the skylight blocks some UV, but not nearly as much as the UV filter, and then blocks 10 to 18% of the whole spectrum, with the most blockage at the blue-green and green band of the spectrum. I may shift to a UV filter for use in telephotos...
- MCC
At 03:55 PM 5/19/01 -0700, you wrote:
Hi,
There was a discussion a while back about Pentax filters, on how to tell if
they are
SMC or not.
I won a 77mm UV SMC off ebay a while back, and it is definitely SMC by the
wonderful colors. Comparing it to the non SMC it`s like night and day.
While on filters, the B+W
polarizer I have is about twice as massive as all the other (cheap)
polarizers I have.
Steve Larson
Redondo Beach, California
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Mark Cassino
Kalamazoo, MI
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