Color play with jan pol, Am I mad and might use software

[Mustafa Umut Sarac]

When I was a scanner operator with Crossfield 656 in 1994 , we were looking to color with meter to below

90 magenta 80 yellow 17 cyan 5 black

may be I would want to calibrate it to less cyan

Now I have no scanner and digital camera and software , I would want to do above action with jan pol m39 on barnack.

How it would be possible to change single color with cmy enlarger lens and how many shots I might take to keep others neutral and what is the method to keep everything together ?

Umut

 

[ic-racer]

Did you get the instruction manual with your lens? If not I'd get that (sorry I don't know of an on-line PDF; you may have to buy it).

You can do these combination with only two knobs:
On knob goes from Magenta to no filtration to yellow.
The other knob goes from Cyan to no filtration to yellow.

So , with those two knobs you can make any of the following:

No filtration
Yellow filtration
Magenta filtration
Cyan filtration
Magenta and Yellow = Red (for example Magenta knob on maximum Magenta and Cyan knob on maximum Yellow, etc.)
Cyan and Yellow = Green (for example Cyan knob on maximum Cyan and Magenta knob on maximum Yellow)
Magenta and Cyan = Blue

So that is every combination except any that produce neutral density. You should be able to look through the lens and see the colors. A few minutes twisting the knobs and you should be able to figure it out.

So if you are shooting slide (transparancy color film) and want less cyan, with this lens you need to add red by twisting the Magenta knob to Magenta and the Cyan knob to Cyan.

 

[Mustafa Umut Sarac]

Thank you very much ic-racer.

Thank you for explaining everything. Now I have to know whether jan pol m39 fits the barnack with 5 centimeters distance from lens back to film plane. bdial suggested to use a contax copy for helisoid on the body. I am still receiving replies to the threads and when I know , everyone will know.

Umut