Andrew said:Dear forum members
I have read the posts on this topic with much interest. The next forum topic, split filter printing appears to be dealing with the same issue.
It is my experience that:
If we are making a straight print, ie. where the whole print gets the same total exposure, then
1. If a print with a particular appearance can be achieved with the split grade ( aka split filter ) technique, then exactly the same print can be achieved with one exposure. It may be necessary to use an intermediate grade ( such as G2.75 ) however this is easily achieved with a dichro colour head. In fact in practice, intermediate grades are not often required.
2. The one exposure method is much quicker and easier,especially if we use an RH Designs Analyser Pro as I do. This equipment if properly calibrated gives very reliable, accurate exposure times and contrast grades.( I have no commercial relationship with the manufacturer or any distributor or retailer of this, or any other product. )
3. The reason for this is easier to understand if we consider the enlarger light source being directed through a dichro colour head. This filtering method exposes every print ( except those made on 0Y+ MaxM or 0M+ MaxY) through part of a blue filter and part of a green filter. Actually the filters are yellow=(green+red) and magenta= (blue+red) but the printing paper is insensitive to the red component.
It matters not at all to the printing paper ( apart from lamp ramp up effects and paper reciprocity characteristics) whether the proportion of blue and green is achieved by differential time exposure ( as in split filter printing) or differential movement of the filters across the light source ( as in a colour head).
Happy printing!
Andrew
Sean said:Hi, I'm going to try split grade printing this weekend. I'm wondering how you filter in dry down time? If the dry down factor requires 12% change, and split grade printing requires 2 different exposures, then how do you determine which dry down to use for each exposure? I think I have an idea but would rather hear from someone who knows. thanks
Les McLean said:I have taught split grade printing in colleges and at workshops for many years and have found that students can generally make good prints quicker and with less wastage of materials once they learn to control the method.
JackRosa said:Les: You state that the key to split-grade printing lies in the density of the negative. Most of my printing work deals with sandwiches (unsharp masks + negatives) with combined density ranges of of 0.65 - 0.80, requiring that I print with magenta filtration settings exceeding 50M (Grade 3++, Grade 4 and higher).
Would you say that, given these circumstances, split-filter printing is not for me and that I should continue printing using a 'single' filter (dichroic filtration setting?
Thank you in advance for your kind insight.
Les McLean said:Jack
I have no experience of unsharp masking therefore don't know the effect on the original negative although I understand that the masking negative does add density. Although I know that it is a very popular method of dealing with contrast I have never really thought that it is a method that I would care to use.
I can tell you that my best negatives for split grade printing are extremely high in contrast and print well using grade 0 and grade 5 only. The logic that I apply in producing a high contrast negative for split grade printing is that the density in the highlight areas simply act as a mask to block the hard filtration in those areas, I guess that my ideal negative is similar to adding an unsharp mask to a regular negative which is probably the reason that I've never really shown an interest in unsharp masking.
Might I suggest that you try split grade printing if the sandwhiches you are using are high in contrast. I'm currently working in London but will be home for the weekend before heading off for another week next Monday but I will try to make time to scan a typical split grade negative that I produce and post it to the technical gallery together with a scan of the print.
I'd be interested in the results of your experiment with sandwhiches and split grade printing.
JackRosa said:Correction: My big question is: Are the density ranges of my sandwiches (0.8 to 0.9) to low to take advantage of the split-filter / split-grade technique?
JackRosa said:Donald:
ii) I do have a pin registration device to produce my unsharp masks but do not have a pin registration unit in my negative carrier. Consequently, I do not have the luxury to create several masks; take the negative out of the <glass> carrier, remove mask #1 and insert mask #2. Do you know anybody who could sell me a pin registration device for my enlarger head: a 10"x10" Omega F Super Chromega II?
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