Thanks Vaughn. IPQU 1:9 with FP4 and D100 both produce plenty of density but the actual contrast gradient is about 1.1.In the past I would have said Kodak Copy Film...wonderful stiff. I have used Ilford's present Copy Film, but only in-camera. That combined with their PQ Universal Developer at 1:9 would be my starting point. But I would also give that developer and FP4+ a try...with that combo with in-camera negatives I can get a density range around 3.0 if the scene brightness range is also wide.
Thanks Vaughn,According to their info, Ilford recommends their PQ Universal developer with their Ortho film. However, it gives time/temps for that combo only up to a Gbar of 1.0, so it might not stretch out to meet the OP requirements. It certainly does in the landscape, but I imagine one may not get as wide a contrast range when copying B&W negatives (which I asume were exposed and developed for silver printing).
Ilford does recommend Phenisol developer for the highest contrast from their Ortho Plus film. I'll have to check it out myself.
I'm starting with 120mm B&W negatives developed for silver and want to enlarge them to print palladium and new cyanotype which require a DR of about 1.8. So it is a large increase in contrast. The contrast increase factor is about 1.6, so a G of 1.3 for both the interpositive and the enlarged negative will get me there. The Ortho+ is less expensive than the FP4 or Delta 100 and supposed to be excellent for copy work.I'll assume your starting point is a color negative and hence the need for a panchromatic negative material to make an interpositive. If that's your road you actually have two opportunities to increase contrast, at the interpositive stage and again when you make the final internegative, two opportunities to bump contrast rather than one.
Thanks for the reply.How big do you need the film? T-Max films are commonly available up to 8x10 and will deliver a high gamma in TMax RS developer - far better control than a paper
developer and Ortho-litho film, though that tends to be a much more affordable option. But you don't want your previous interpositive to have high contrast. It should be slightly overexposed and underdeveloped.
You can do the same thing with 120 black and white film, I have done that to make very high contrast "lith" negatives, make an interpositive first and then make a new negative the size of your final image. Lith film for both steps and you can use any paper developer since you are doing it in two steps.I'm starting with 120mm B&W negatives developed for silver and want to enlarge them to print palladium and new cyanotype which require a DR of about 1.8. So it is a large increase in contrast. The contrast increase factor is about 1.6, so a G of 1.3 for both the interpositive and the enlarged negative will get me there. The Ortho+ is less expensive than the FP4 or Delta 100 and supposed to be excellent for copy work.
Will let you know. Thank you for your input!
you need to investigate doing Ziatypes. you can easily use a grade #2 negative for the process; there is no developer used as it is a POP process and you can achieve different color levels too. I'm in the process of learning all the nuances right now.I need to generate a G bar of greater than 1.3. This is needed to enlarge medium format negatives onto panchromatic film to print in alternative processes (ie. new cyanotype and palladium).
Paper developer generated great density but the contrast is not getting to where i need it.
Thanks,
J
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