The biggest thing wrong with the step up plan you use is that lens hoods are problematic. You should never use a filter without a lens hood in order to minimize flare. Also, be sure to get multicoating
The sensitivity to LP vs CP can affect both AF sensors and metering sensors, depending upon how a particular camera is designed. The P645 metering sensors read from the focusing screen, which scatters and remixes the light unless I'm mistaken, so it's not sensitive to a linear/circular polarizer, but I'd buy a CP anyway as future proof for when you might get a camera that requires it. 77mm size is pretty expensive. I think the Panasonic "Lumix" 72mm I bought was $115 or so from B&H. If you can't afford the B+W filters (the best), take a look at the Hoya Pro-1 models. That 72mm polarizer above is a re-branded Hoya Pro-1 and is beautifully finished, very slim, and costs 30% less than the B+W. The coating is very good. It also has filter threads on the front side so you can fit a lens hood. Godfrey On Jun 5, 2008, at 7:42 AM, Scott Loveless wrote: > Howdy! > > So I'm shopping for a polarizer again. A year or two ago I asked > about > polarizers, but I can't find the thread. Anyway, I ended up with a > fairly inexpensive Sunpak 58mm polarizer from the LCS and a few > step up > rings for the smaller lenses. Now the 645 needs one. The filter ring > sizes are 58, 67 and 77mm, and I'm leaning toward the same kind of set > up - one polarizer and step up rings. The camera budget is not > going to > allow for a polarizer on each lens, a la Charles Braswell. > > IIRC, since this is a manual focus system I shouldn't need a circular > polarizer, though it certainly wouldn't hurt. Perhaps a few of you > could make some recommendations on brand, etc., before I buy one. B&H > has a Hoya linear polarizer for about $40US. But anything under $100 > should be fine. > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
