It's been a while since I last used any Galerie FB, but my recollection is that its characteristic curve had a shorter toe than that of MG IV FB, which resulted in relatively steeper highlight contrast. It was closer to the original MG FB in this respect, and as such a better match than MG IV FB to Tri-X, for example.
Also, Dmax untoned was a bit greater than what you get with MG IV FB. Print color was similar.
I'd also be interested in any observations from people using current-production Galerie FB.
I'm currently using Galerie FB as my primary paper with FP4 Plus negatives and recently tried some MG IV FB for the first time in perhaps five years. I can corroborate that toe observation. Print color was similar, but I used Neutol WA on both papers, and Galerie might be more responsive to different developers with respect to color than MB IV FB is. In the past I got the same warm-black tone from MG IV FB irrespective of what developer it was processed in.It's been a while since I last used any Galerie FB, but my recollection is that its characteristic curve had a shorter toe than that of MG IV FB, which resulted in relatively steeper highlight contrast...Print color was similar...
In terms of contrast, MG IV FB with a 2 filter has an ISO range of 100, with a 3 filter it's 80. Galerie FB grades 2 and three have ISO ranges of 110 and 90. Therefore, if one were planning to print with 2 and 3 filters only, MG IV FB would prefer a slightly less contrasty negative than Galerie FB. Of course, targeting the negatives to Galerie FB still leaves open the option of printing them on MB IV FB with slightly lower numbered filtration.
Very generally, it's related to the negative contrast that will print well. For R110, negatives with a density spread (which I'm sure ISO defines somewhere) of 1.1 are supposed to be appropriate matches. In practice, there's lots of variation in curve shape, which defines where good separation is distributed between highs, mids and lows, and how each printer feels about what constitutes appropriate levels of detail in those areas. I don't perform any densitometric measurement to evaluate negative/paper combinations, but do refer to manufacturers' R numbers for a rough indication of their papers' relative contrasts. Printing and critical evaluation of the results are my ultimate guide.Sal, I'm just curious about what paper ISO range is. Could you explain it in terms of characteristic curve?
Very generally, it's related to the negative contrast that will print well. For R110, negatives with a density spread (which I'm sure ISO defines somewhere) of 1.1 are supposed to be appropriate matches. In practice, there's lots of variation in curve shape, which defines where good separation is distributed between highs, mids and lows, and how each printer feels about what constitutes appropriate levels of detail in those areas. I don't perform any densitometric measurement to evaluate negative/paper combinations, but do refer to manufacturers' R numbers for a rough indication of their papers' relative contrasts. Printing and critical evaluation of the results are my ultimate guide.
So does it mean that for two papers with the same straight line slope, one will accomodate a negative with a bigger density range than the other? I'm simplifying, but I'm just trying to make sure I understand the basic principle.
Oren, what does all that actually mean? how does it look in a print? show us an example, post an image with a big toe and one with a pinky
Next time I have a print with a full range of tones that I need to scan, I'll whip up a set of teaching examples on this point as well and will post it back here if someone else hasn't already done so. It may be a little while, though.
Yes, if by "slope" you really mean "curve shape", because the slope (the steepness) is precisely what's different. The real-world complication is that no papers actually have straight-line curve shapes, but yes, you get the idea.
Am I making sense other than theoretically?
You have the right idea, but your second example complicates things by changing the Dmax as well as the slope, and pegging everything at (0, 0) is also not realistic. But yes, the ISO range of the paper is an indication of the density range of negative that can be rendered with full information in the print.
Assuming the straight line, a paper with a curve from (0, 0) to (15, 15) can accommodate a contrastier negative than a paper with a curve from, say, (5, 0) to (10, 15). If you like, call the first one a "grade 1" and the second one a "grade 4". This is just a crude version of what you might see in the characteristic curve data that manufacturers provide for their papers. Sketch it out and you'll see what I mean.
What I was curious about was whether it were possible that two papers having different slope angles in the straight line portion could still accomodate the same negative because of their different Dmaxes.
I think so, in principle. What matters is the span on the X axis that corresponds to the distance between Dmin and Dmax on the Y axis. However, whether the print made on the paper with lower slope and lower Dmax would look any good is a different question.
I think so, in principle. What matters is the span on the X axis that corresponds to the distance between Dmin and Dmax on the Y axis. However, whether the print made on the paper with lower slope and lower Dmax would look any good is a different question.
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