linear or circular polariser?

[suselko]

Dear all,
I'm planning to buy a polarising filter for my Bessa (mount on a 39-77 step-up ring with a hole to see the filter), but am not sure which one to buy. I've read that linear should be used with manual cameras and circular with autofocus/TTL ones. I am not going to use my camera's TTL though as I use a handheld meter for measuring exposure. So it sounds like I need a linear filter. But perhaps there are more differences between them that I don't know about? Could you comment on that?
Cheers
Filip

 

[Sparrow]

As I understand it a liner polariser will just “fool” the auto-focus on some cameras so either type should be OK on your Bessa.
I do the same thing as you’re intending to do and it works fine, the 77mm also fits the filter adaptor of the f5.6 12mm