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K2 vs CK3

 
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pv17vv



Joined: 22 Dec 2001
Posts: 255
Location: The Ardennes, Belgium

PostPosted: Sun Dec 06, 2009 4:45 pm    Post subject: K2 vs CK3 Reply with quote

Hello all !

Just purchased a handfull of Series Kodak filters.

What is exactly the difference between yellow K2 and yellow CK3 ?

Why should still- and movie-cameras need different filters ?

Thanks.

Georges
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C. Henry



Joined: 13 Dec 2005
Posts: 356
Location: North East Georgia, USA

PostPosted: Sun Dec 06, 2009 6:43 pm    Post subject: Reply with quote

Georges;

My copy of the Photo Lab Index says that "K2" is an old designation for a #8 filter and "K3" for a #9 filter. A #9 is a deeper yellow than a #8. The PLI also indicates that a #9 will usually over correct cloud - clear sky contrast in black & white photography.
As for the "CK3" designation, I'm guessing that it was just a marketing ploy to try to convince amateur movie people that they need special filters instead of the more generally used ones.

C. Henry
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Les



Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI

PostPosted: Sun Dec 06, 2009 6:47 pm    Post subject: Reply with quote

Well there's this scan of a kodak catalog that admits the CK3 is a cine filter, but it doesn't say why. the difference (at least in Kodak's graph) between a K2 and K3 (#8 and #9) is minimal,

But maybe movie film stock was slightly different than 35mm? and needed the sight difference between a K2 and K3? If so, why the Cine? why not just say K3 for movies?

A Marketing gimmick?

http://kodak.3106.net/index.php?p=303&cam=919
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glennfromwy



Joined: 29 Nov 2001
Posts: 903
Location: S.W. Wyoming

PostPosted: Sun Dec 06, 2009 9:53 pm    Post subject: Reply with quote

CK = cine Kodak. Why? I know nothing.
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Glenn

"Wyoming - Where everybody is somebody else's weirdo"
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pv17vv



Joined: 22 Dec 2001
Posts: 255
Location: The Ardennes, Belgium

PostPosted: Mon Dec 07, 2009 6:05 pm    Post subject: Reply with quote

Thanks my Friends.

Observation of said filter after a good cleaning shows two things :

1 it is a very small bit denser than K2

2 it is half thinner in the mount, as if one of both glasses was missing

K3 in plain glass instead of dyes between cemented glass ?
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glennfromwy



Joined: 29 Nov 2001
Posts: 903
Location: S.W. Wyoming

PostPosted: Mon Dec 07, 2009 7:13 pm    Post subject: Reply with quote

That's very possible. Regular Wratten filters, such as the K-2 are gelatin between two glasses.
The CK-3 is probably dyed glass. It probably has a different spectral sensitivity, too. I'm going to speculate that it is a pro item.
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Glenn

"Wyoming - Where everybody is somebody else's weirdo"
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