I seem to have been able to download a copy of Mr Anchell's book.
Thank you Steve.
On Page 40, under the heading Developer Volume, he quotes Kodak as saying that 150ml of developer is the minimum for 80 sq ins of film. Then he asserts that for "full and complete development" we should use more. And somehow, we arrive at 250ml. Why not 300? 500?
Two points arise. Firstly, which developer? It cannot be a universal rule or some developers would require a bathtub. On page 41, it seems that he is assuming D76.
More importantly perhaps, we do not subject negatives to "full and complete development". Prints, yes, but negatives are developed to produce a desired level of contrast, not maximum possible density. That's half of the Zone System. We can use agitation, temperature, time and dilution as we choose. Dilution is only one factor. Mostly, we use time.
For LF photography, there's another factor. A roll of 35mm film (nominally 80 sq ins) may be assumed to have a variety of images with an average overall density. An LF negative would consume different amounts of active ingredient for different subjects – cats in coal cellars and brides in snowdrifts.
I have to admit that this is a last-minute thought and I don't know how significant it is.
It would be relatively easy to test Mr Anchell's assertion in the Stearman 10x8 tank. Not me, or rather, not at the moment.
Thank you Steve.
On Page 40, under the heading Developer Volume, he quotes Kodak as saying that 150ml of developer is the minimum for 80 sq ins of film. Then he asserts that for "full and complete development" we should use more. And somehow, we arrive at 250ml. Why not 300? 500?
Two points arise. Firstly, which developer? It cannot be a universal rule or some developers would require a bathtub. On page 41, it seems that he is assuming D76.
More importantly perhaps, we do not subject negatives to "full and complete development". Prints, yes, but negatives are developed to produce a desired level of contrast, not maximum possible density. That's half of the Zone System. We can use agitation, temperature, time and dilution as we choose. Dilution is only one factor. Mostly, we use time.
For LF photography, there's another factor. A roll of 35mm film (nominally 80 sq ins) may be assumed to have a variety of images with an average overall density. An LF negative would consume different amounts of active ingredient for different subjects – cats in coal cellars and brides in snowdrifts.
I have to admit that this is a last-minute thought and I don't know how significant it is.
It would be relatively easy to test Mr Anchell's assertion in the Stearman 10x8 tank. Not me, or rather, not at the moment.