[joachim]

[quote name='miro' timestamp='1283511570' post='2446']

Hello,

After unfrequent use of circular polarizers I discovered that my two Hoya CPL have some scratches at front side . At the same time I don’t have any scratches on all my lenses equipped with different brands of UV filters.

I have

1. Hoya 52mm HMC circular polarizer - green label

2. Hoya 77mm Pro1-Digital - blue label. I have some doubt about this filter /maybe fake/.



My question are

1. Where is located the polarizing film on Hoya filters?

a. front side of the glass

b. back side of the glass

c. between two glasses as B+W

2. Should I handle CPL filters with extra special care? /since I don’t have any scratches at my lenses and UV filters./

3. How durable are other brands of CPL. E.g. B+W or Helioplan?



Thanks in advance

Miro

[/quote]



I have various Hoya HMC filters and a few of them have scratches from cleaning. I read similar reports from other people. Hoya HMC just doesn't seem to be very hard and needing some care when cleaning. Since they are cheap, I keep buying them and chuck them when it gets to bad. I thought the coating of the Pro1 was harder, but maybe not.



I recently got some B+W MRC. So far no issues.