APUG - View Single Post - PMK VS Pyrocat-HD Stuff

GreyWolf · 01-01-2005, 09:33 AM

Hello Sandy,

From this observation...

"Again, after some experimentation I found that a negative CI of .70 was needed to print with the same contrast on VC paper using a #2 filter as a negative with a CI of .52 printed on graded paper."

Would I be foolish to now make the assumption that this would be similar for all VC papers?

I am also curious as to why there is such a dramatic difference in the CI required when printing on VC paper. Would you be able to explain this in simple terms or perhaps at least speculate on the possible reasons?

When you printed on the graded paper would it be correct to assume that you were using your enlarger light source without any VC filters in play and as such used that as your baseline for a #2 graded paper?

If so... how different would you speculate that the color output of your enlarger is without filters, is in relation to your enlarger with a filter in place to print a #2 VC paper?

My personal experience with my enlarger (Saunders 4500) is that with VC paper I print approximately one grade harder without a filter as I do with a #2 Ilford filter in play. In other words...I must use a #3 filter to closely approximate a print that would otherwise print the same (time adjusted of course) without any filter being used.

I am just surprised by the the extreme difference that you are reporting in CI from a graded paper to a VC paper.

Kind Regards,

01-01-2005, 09:33 AM	#9 (permalink)
GreyWolf Join Date: Feb 2003 Location: North of Calgary, Alberta. Canada Posts: 166	Hello Sandy, From this observation... "Again, after some experimentation I found that a negative CI of .70 was needed to print with the same contrast on VC paper using a #2 filter as a negative with a CI of .52 printed on graded paper." Would I be foolish to now make the assumption that this would be similar for all VC papers? I am also curious as to why there is such a dramatic difference in the CI required when printing on VC paper. Would you be able to explain this in simple terms or perhaps at least speculate on the possible reasons? When you printed on the graded paper would it be correct to assume that you were using your enlarger light source without any VC filters in play and as such used that as your baseline for a #2 graded paper? If so... how different would you speculate that the color output of your enlarger is without filters, is in relation to your enlarger with a filter in place to print a #2 VC paper? My personal experience with my enlarger (Saunders 4500) is that with VC paper I print approximately one grade harder without a filter as I do with a #2 Ilford filter in play. In other words...I must use a #3 filter to closely approximate a print that would otherwise print the same (time adjusted of course) without any filter being used. I am just surprised by the the extreme difference that you are reporting in CI from a graded paper to a VC paper. Kind Regards, __________________ Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.