I have a the (light) yellow and (medium?) red bay I size filters, they're great! I too would assume that they are single coated, but I have never had any flare issues with them. They are well built with the metal ring and feel very solid. I wouldn't hesitate to buy them if I had to do it again.
I have a number of Rollei filters and can say they are of the highest quality. Given their age they're almost certainly single coated, but I've never encountered any problems. I'm inclined to think terms like "multi-coated" or "digital compatable" filters are largely sales talk to justify price increases.
Hello,
the coating process was applied since about 1949, so very old wartime or pre-war filters are not coated. You can identify coated Rollei filters by their blueish shining and reflecting surface. Most probably they were made from Schott filter glass, one of the most competent manufacturer of optical glasses.
I've used Rollei filters and can assure you that coated or not (I think NOT) they are high quality and fulfil their intended goal. Its not like Rollei didn't know what they were doing, after all. Use a lens hood, too, and you'll have no problems.
I've used Rollei filters and can assure you that coated or not (I think NOT) they are high quality and fulfil their intended goal. Its not like Rollei didn't know what they were doing, after all. Use a lens hood, too, and you'll have no problems.
Ha, I always wondered what that bluish sheen was, and in fact have spent some time trying ever so gently to clean it off. Yet another attempt at photographic self-sabotage.
B+W quit making Bay filters late last year. AFAIK Heliopan is the only source of new filters. Buy original Rollei filters, KEH always has some; they're as good as any newer ones that you'll find.