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> Minimum amount of stock developer to develop film. |
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#11
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Quote:
Neil..
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"The aim of art is to represent not the outward appearance of things, but their inward significance." Aristotle Neil Souch Last edited by B&W Neil; 25th July 2022 at 08:48 AM. |
#12
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It has just come back to me re the ref to the minimum amount of HC110 required for each film. I am sure I read it in 'The Film Developing Cookbook' - by: Stephen G. Anchel - Bill Troop.
When I have the time I'll check this out but I'm sure that's where it came from. I suspect it would have been a Kodak recommendation and it came from there. Neil.
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"The aim of art is to represent not the outward appearance of things, but their inward significance." Aristotle Neil Souch |
#13
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There was a website called
Covington Innovations or something similar, which had a lot of useful information about HC110. I think the 6ml figure may have been mentioned there. The site is about Astrophotography. I have the book by Mr Covington. It is very interesting, not just in connection with HC110. Alex Sent from my iPhone using Tapatalk Pro |
#14
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The best place to start with any film / dev combination is the film / developer maker's recommendation and if indeed needed modify from there.
Neil.
__________________
"The aim of art is to represent not the outward appearance of things, but their inward significance." Aristotle Neil Souch |
#15
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The 6 ml of HC-110 concentrate per 135-36/120 roll/8x10 sheet figure comes from the capacity without replenishment recommendations in the HC-110 datasheet J-24, which specifies
5 rolls/sheets per liter of dilution B in a tank, not a tray. One litre of dilution B (1 + 31) includes 31.25 ml of concentrate. 31.25/5 = 6.25 ml of concentrate per roll, which most will round off to 6 ml per roll. In essence, one needs to look to the capacity recommendations. Different developers, and different dilutions of developers will have different developing capacities - the ability to fully develop rolls of film without running out of "oomph". When one exceeds the development capacity, one can end up with incompletely developed highlights due to developer exhaustion in that part of the negative. Capacity recommendations are based on both knowledge and assumptions - knowledge about the chemical makeup of the developer, and assumptions about the nature of negatives. If one is developing a number of very dense negatives of very light scenes, the negatives require more development capacity from the developer than if one is developing a number of thin negatives of mostly dark scenes. Kodak's capacity recommendations are oriented toward commercial labs, include assumptions about how negatives will average out over a range of films, and include a robust safety margin, because neither labs nor their customers want a bunch of results with weak highlight densities due to developer exhaustion. X-Tol is another developer, and Kodak has even clearer recommendations in its datasheet J-109: "The volume of diluted XTOL Developer needed to cover the film will depend on the size of your tank or tray or the design of your rotary-tube processor. However, the minimum amount of diluted developer needed to cover the film may not contain enough active ingredients to develop the film fully in the recommended time. We recommend always starting with at least 100 mL (3.5 fluidounces) of full-strength developer to prepare the diluted solution for each 135-36 or 120 roll (or the equivalent of 80 square inches [516 square centimetres]). For example, when processing 4 rolls of film with developer diluted 1:1, use at least 800 mL even if the processing equipment will allow the use of less solution. " |
#16
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Quote:
With HC110 I've found using it as a one-shot dev works best for me and provides good negs guanteed every time - 35mm / 120 developed in tanks and 5x4 in trays (6ml concentrate per film). The various dillutions can feel strange at first but after a while they become normal. There is the HC110 Made Easy Method which uses 1:50 times. I have posted times for some films already on FADU for 1:50 development. Neil.
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"The aim of art is to represent not the outward appearance of things, but their inward significance." Aristotle Neil Souch Last edited by B&W Neil; 29th July 2022 at 09:00 AM. |
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