[Brightcolours]

[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 do not use any UV filters on any of my lenses, and none have scratches on the front element. My 67mm B&W circular pol. filter has no scratches, so I guess it must be that the Hoya coatings just are not very hard.

My Hama 77mm circ. pol. filter also has no scratches. I thought that Hama filters were actually Hoya made, though... But i also do not use that filter a lot. My Toshiba linear pol. filter also has no scratches.



The pol. film is sandwiched between glass, as far as I know (with all brands), you can not touch it.