Jennifer Webster |
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Looking for conversion chart
A friend of mine loaned me his enlarger. This enlarger has a color enlarger over the bessler 23c. I am looking for the conversion chart to use the color dials as BW filters. I was told that there is one and it can be more accurate than buying the b/w filters. If anyone knows where I can get one I would appreciate it.Thank you in Advance,
Jen
February 27, 2006
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Christopher A. Vedros |
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Jen,
I did a couple searches, and some forum comments I read said that some Variable-Contrast papers have a conversion chart on the information data sheet that comes in the box. Check your paper to see if it has any info.Whether or not it is more accurate than using a set of VC filters I think is a moot point. Contrast is subjective. The "correct" contrast filter for a print is the one that gives a result that you like the best. I can see where a chart would be a big help, though, since you could dial in the equivalent of say a #3 filter to get a starting point. And then the dials would give you more control to make adjustments. A test strip will still be your best tool for finding the setting that works. Chris
February 27, 2006
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Alan N. Marcus |
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Valuable contrast paper is multi-coated. One low contrast coating sensitive to green light, the other a high contrast sensitive to blue light. The enlarger’s incandescent printing lamp radiates both colors. Exposure without filter exposes both coatings resulting in a normal contract grade 2. Since a yellow filter is a blue light blocker, strong yellow filtration such as 200Y allows only green light to reach the green sensitive low contrast coating. Likewise a magenta filter is a green blocker. Exposing with a strong 200M exposes only the blue sensitive high contrast coating. Grade 0 through 5 is achieved using different strengths of yellow and magenta filters. 0 200Y
0 90Y
1/2 70Y
1 55Y
1 1/2 30Y
2 None
2 1/2 5M
3 25M
3 1/2 50M
4 80M
4 1/2 140M
5 200M Alan Marcus
March 10, 2006
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Justin G. |
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wow Alan this is very helpful. The majority of the enlargers at the college I use have the filter holders broken so sometimes I get stuck holding a filter in place for 20-45 seconds at a time and doing multiple prints, my arm gets tired! I'll just switch to a color head now and play with these! thanks a many.
March 10, 2006
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Jennifer Webster |
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Alan, Thank you so much. This is make things much easier for me!
March 10, 2006
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Alan N. Marcus |
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Slight revision: The 200Y is grade 00
sorry the 00 did not copy correctly on my previous posting.
00 200Y
0 90Y
1/2 70Y
1 55Y
1 1/2 30Y
2 None
2 1/2 5M
3 25M
3 1/2 50M
4 80M
4 1/2 140M
5 200M
Alan Marcus
March 10, 2006
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