CC-4 Dark Blue filter

[Rick1779]

It was on the Jupiter-12 and din't find any information about it.
It looks very darker than any other blue filter I've ever seen and I'm wondering what is the purpose of such a filter

[philslizzy]

CC would imply it is a colour correction filter, perhaps 1 is the lightest. Maybe to use daylight film under 2800k or lower tungsten light. An educated guess.

[Rick1779]

If it's cyrillic should be SS-4 filter, not so sure though

[philslizzy]

I don't know about SS but is still seems like a colour correction filter. look at this cokin page. http://www.cokin.co.uk/pages/colour2.htm

The 80A filter is to correct 3200k photofloods to balance with daylight film. Kodak did make one which balanced 2800k - the redder domestic light bulbs, the filter would would be a deeper blue than the 80A. The Russians are unlikely to have gone with the Kodak naming conventions. So what I said before, I still believe could be the right answer.

To test it, set your camera color balance to 'daylight' then take a shot inside under tungsten light with the filter. If the colours appear natural - then that's what it is.

[philslizzy]

Of course this filter can be used to enhance freckles and dark skin - if the model would be happy with that.

Black & white film only of course. It seems that filters have little effect on digital cameras working in mono.

[Rick1779]

Here they are some shot

with the filter on




same shot converterd to B&W


same scene, different shot without filter


converted to B&W


same shot, B&W converted and with the default silkypix blue filter


as far as I can see the tone is quite different from the default silkypix blue filter

[Rick1779]

and here are a couple of shot of the filter




when the filter is screwed on I can't see the aperture settings on the J-12

[Jvg]

I think CC stands for "синий синий", which translates as double deep blue, equivalent to 80B (2 80As). And number four stand for filter factor. I might be wrong though

[philslizzy]

[Jvg]

[philslizzy]

Possibly, it will have more blue to compensate for the redder light of a domestic house bulb.

Rick1779, have you tried it as a colour conversion filter as per my suggestion?

[Rick1779]

yes, is all blue, no matter the WB settings

[philslizzy]

I conclude that it is a mysterious blue filter. Possibly designed for specialist industrial use.

[Rick1779]

when I'll have some time I'll take some tests with different wb settings