Cokin a160 and b160 polarising filter

Laci Toth · Oct 14, 2019

Hi everyone,

I’m wondering what is the difference between the Cokin a160 and b160 polarising filters?
As far as I know they’re both linear but is there anything else (probably yes)?

macfred · Oct 14, 2019

AFAIK the 'a type' was a linear polarizer and the 'b type' a circular one. If you use AF and TTL metering you should go for the circular type.
All about polarizer: http://www.bobatkins.com/photography/technical/polarizers.html

AgX · Oct 14, 2019

No, 160 was linear.

Today they got 164, which is circular.

I assume "A" and "B" are indicators for the size of the holder.
In the beginning there only was one holder size. I think once there were 2. Meanwhile they got 4 (S,M,L,XL)

macfred · Oct 14, 2019

AgX said:
...
I assume "A" and "B" are indicators for the size of the holder.
In the beginning there only was one holder size. I think once there were 2. Meanwhile they got 4 (S,M,L,XL)

I thought there was 'A' and 'P' for the size. I'm outdated I guess ...

Laci Toth · Oct 14, 2019

Thanks for the additional info!

Kino · Oct 14, 2019

Will the linear type cause exposure errors in TTL systems that do not use partially silvered mirrors, such as the Minolta SRT series?

I have a Cokin 160 and was playing with it, getting weird bifraction effects looking at my computer monitors, wondering if it was of any use at all?

Seems pretty useless if you have to guess at an exposure correction...

MattKing · Oct 15, 2019

Kino said:
Will the linear type cause exposure errors in TTL systems that do not use partially silvered mirrors, such as the Minolta SRT series?

No.

Cokin a160 and b160 polarising filter

Laci Toth

macfred

AgX

macfred

Laci Toth

Kino

MattKing

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