 Ryan Chai |
Pull or Push? I just bought some Kodak 100Tmax, and I was researching the different processing methods. I am new to photography. What is push/pull processing? What does it do to the picture. Is it how they change a under/over exposed picture. Thanks for any help.
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Tony Sweet |
Pushing film is simply using the film at a different speed than what it was intended. For example, shooting ISO 100 film at ISO 400. This enables one to get an exposure on an image at a normally unusable light situation, by making the film more sensitive to light. All films don't push well, Fuji transparency films do. The result is a bit more grain, more contrast, and not razor sharp images. But, when caught in a situation where you have the wrong film or don't have the film one would need, pushing can save the day. Pulling film is the oppposite where film is rated at, for example, ISO100 and shot at ISO50. This occurs mostly by mistake and, when one changes film and forgets to reset the ISO. I can think of no practical reason to pull film, although there are probably some reasons that I'm unaware of.
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Ryan Chai |
Thanks alot, This site is wonderful, I have learned so much.
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Chancy Lewis |
As to why a person would "pull" film, refer to Ansel Adam's advise to expose for the shadows and develop for the highlights. This process works poorly in color print films, but in black and white emulsions it permits the photographer to predetermine the qualities desired in the final print before the shutter moves. This works because the highlights of a film develop last, but shortcutting the processing when shadow details are optimal, the photographer avoids the necessity of radical dodging or exhaustive burning-in. Although some experimentation is required to match the developer and the photographer's darkroom techniques, the suggested cuts in developing are 10 percent of total time per f-stop difference; therefore, if a meter reading in bright sunlight calls for 1/500th at f-16, but the shadows read 1/500th at f-4, cut the developer time by 30 percent. The compromise makes a printable negative with beautiful greyscale. Pulling transparency films results in rich color saturations. Most often, two f-stops below meter readings will get a transparency that projects very well and some interesting prints. For the latter it doesn't matter whether the prints are accomplished using internegative, positive transference, or today's electronic scanning.
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mansour gorbanian |
very good . these pictures is very good
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