You could do that but here's another option. 49 and 55mm filters aren't
used on much of anything these days except old Oly lenses (and maybe a
Pentax or two). The used market is aflood with them as evidenced by
this ebay ad from a seller with very good feedback (otherwise I don't
know him)
<http://stores.ebay.com/Eastok-Sundries_Polarizer-filters_W0QQcolZ4QQdirZ1QQfsubZ16QQftidZ2QQtZkm>
In this subset of his store list (polarizers only) he has two 55mm B+W
circular polarizers with a BIN of $15.95 and one with case for $17.95.
There aren't any B+W's in 49mm listed (at this store at least) but there
are plenty of Hoyas and other brands... and hundreds more listings
besides this store. Or you could simply add a 49->55 step-up ring.
Caution: One of his 49mm listings is in error, it's actually 48mm which
you can see since he takes a photo of each item.
By the time you get up to 67mm there are a lot more current lenses in
competition for those used filters so prices are higher than would be
indicated by just the size difference. I didn't find any used B+W's but
there are lots of Hoyas around. I don't think it would be very
practical to use step up rings to get from 49 or 55mm up to 67mm but it
probably could be done.
Chuck Norcutt
Johann Thorsson wrote:
> This topic reminds me that I am planning to buy polarizers. I have 49, 55
> and 67mm threads so I would have to buy three sets if I buy the normal screw
> on filters. However, if I buy a system like Cokin, I can save considerable
> money, but I have no clue how the Cokins rank up with some of the other
> brands. Does anyone know?
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