It also helps tame some of the extreme contrast — although some people find high contrast to be part of the charm. Pre-flashing is a method involving exposing paper to additional light either before or after the exposure. Many people use enlargers to pre-flash but not having an enlarger, I opted to try an SB flash leftover from my Nikon days. That said, after popping the sheet into developer, the speed at which paper went from white to jet black confirmed I was on the wrong path.
Several failed lighting attempts later, and I eventually resorted to using an LED keychain flashlight. With the paper on the floor, I held the keychain at ceiling height and shone it down for 2 seconds counted manually, so pretty approximate. This amount of pre-flashing turns Ilford RC paper my most often used paper a very, very light grey if you develop it immediately. I also do my darkroom work under an LED headlamp that has a red light mode so this whole process is very easy to manage in my mostly-dark bathroom.
The Oriental pearl is different, though. With my headlamp ruining the paper before it was even shot, I resorted to putting a dim LED stick tip-down into an amber beer bottle.
There was no way I wanted to use a lot of these precious sheets on testing. A better way to proceed, and compare, was to shoot several exposures on a single sheet. To do this, I loaded 4 sheets into two film holders: two that had been pre-flashed using the system above ; and two that had not. Using an arbitrary ISO value of 4, I metered a scene where the light would be fairly constant during my tests. That one sheet now had three different exposures, shot number one which received 3 times the amount of light indicated by the meter, shot number two with double the exposure and shot three which had the metered amount of light.
For my next trick, I flipped the film holder and shot at a base of ISO 6. That gave me three more shots at effectively ISO 18, 12 and 6. I also liked having two shots at ISO 12 as a kind of control to make sure both sheets were developed a similar amount. I did the whole thing all over again with the pre-flashed paper. Imaging materials — Unprocessed photographic films and papers — Storage practices. Imaging materials — Wet-processed silver-gelatin type black-and-white phototgraphic reflection prints — Specifications for dark storage.
Imaging materials — Wet-processed silver-gelatin type black-and-white photographic reflection prints — Specifications for dark storage.
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Imaging materials and prints — Abrasion resistance — Part 1: General rub testing methods. Imaging materials and prints — Abrasion resistance — Part 2: Rub testing of photographic prints. Imaging materials — Photographic reflection prints — Determination of abrasion resistance of photographic images. Imaging materials — Reflection colour photographic prints — Method for testing stability under low humidity conditions.
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Imaging materials — Scratch resistance of photographic prints — Part 2: Sclerometer test method. Photography — Photographic reflection prints — Part 1: Evaluation methods of image quality. Photography — Photographic reflection prints — Part 2: Evaluation of colour variation in printing. Permanence and durability of commercial prints — Part 1: Definition of use profiles and guiding principles for specifications. Permanence and durability of commercial prints — Part In-window display — Light and ozone stability.
Store Standards catalogue ICS 37 ISO Photography — Determination of diffuse transmission density. ISO Photography — Determination of ISO speed of monochrome black-and-white , continuous-tone photographic negative materials for still photography. ISO Photography — Determination of thiosulphate and other residual chemicals in processed photographic films, plates and papers — Methylene blue photometric method and silver sulphide densitometric method.
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ISO Photography — Processed photographic film for archival records — Silver-gelatin type on poly ethylene terephthalate base — Specifications. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email.
Notify me of new posts via email. Create a free website or blog at WordPress. Thank you so much for watching this tips and tricks. I hope it will be useful. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
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Viewed times. Improve this question. I know it's not directly what you're asking, but have you considered just sticking a ND filter in front of your pinhole? Excellent question! My experience is that different papers have different resistive levels.
I've used Kodak and Ilford and noticed that Kodak was more sensitive. You may also want to see this where an ilford customer service rep talks about it.
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