I'm still almost a newbie in photography, especially in using flash
lite.
I have a Pentax Mz-5 and an MX and some manual and AF lenses:
Pentax K 28mm f/3,5

I have the opportunity to buy an analog Zone 6 Pentax spot meter for
about $110 from a reputable mail order store. This seems to me to be a
very good price. Too good perhaps. I have heard bad things about Zone
6's modification workmanship on these meters.

I'm thinking of buying a circular polarizer via eBay, and it seems that
different sellers are extolling the superiority of each of the above Hoya
filters above the other. So, does anyone know what the difference between
those that come in the green and blue cases? A quick google ...