Letter codes on FSU filters

[pschauss]

I have a number of FSU filters some of which have codes like ж 1.8 and others with жC 1.8. I assume that the ж stands for жёлтый (yellow). What does the "C" stand for? IIRC the Russian word for green starts with "z".

 

[Ko.Fe.]

This is the page with filter codes in Russian.
http://zhurnalko.net/=sam/junyj-tehnik-dlja-umelyh-ruk/1985-03--num7

ЖС-18 is high density yellow. ЖС-17 is medium yellow. ЖС-12 is light yellow.

Filters were manufactured in different places. At some of them no C was printed, because it doesn't mean anything, I guess.

 

[David Hughes]

Hi,

If it will help the filter factors are:

ЖС-18 x3

ЖС-17 x2

ЖС-12 x1.4

Had a quick look at mine and some have the LZOS logo and some the KMZ one but all have the C. And I've one or two just marked M 40,5 ...

Regards, David

 

[nikarlo]

and for different colors?

 

[Ko.Fe.]

O - orange.
K - red.
C -blue.
3 - green.