![]() For example, if you’ve got an ISO 50 film, expecting to have a photoshoot in bright sun, you may suddenly need an ISO 200 film if the clouds unexpectedly cover the sky. Why should you push or pull film?Ĭhanging light conditions may require you to push or pull film. Kodak Portra 800 pushed to EI 3200 (+2 stops). But to keep things simple in this article, I refer to EI as “ISO” and disambiguate these terms in the glossary section below. Instead, a new exposure index (EI) is used to set the light meter value. ✱ - Technically, the film’s ISO rating does not change as it’s pushed or pulled. When pushing or pulling black and white films, different developers and developing techniques may give you various results in terms of grain and contrast. Others will degrade significantly after one or two stops. Some films will allow you to push or pull them up to five stops while still giving a workable image. However, doing so will increase the grain size (more so while pushing), likely decrease the dynamic range of your film, increase contrast (while pushing)/decrease contrast (while pulling), and alter the saturation (when dealing with colour films). ![]() You can push or pull any modern emulsion. When doing this, you should set your light meter to ISO 50 when metering your scenes. This decreases its nominal light sensitivity.įor example, you can pull-develop an ISO 100 film -1 stop to behave like an ISO 50 emulsion. Pulling film means leaving the emulsion in the development chemicals for a shorter time (i.e., pulling the film out of the tank early). Because your film behaves like an ISO 200 film, you should also set your light meter to ISO 200 when metering your scenes. This increases its nominal light sensitivity.įor example, you can push-develop an ISO 100 film +1 stop to behave like an ISO 200* emulsion. Pushing film means leaving the emulsion in the development chemicals for a longer time. However, they will typically charge extra for the service. Push and pull development can be done at (some) labs, thus you don’t necessarily need to know how to develop film at home. I will also show you some examples of push- and pull-processed black and white, colour, and cross-processed film. In this short guide, I will explain what pushing and pulling film is exactly. Usually, this means the finest grain and the most accurate colour with standard development times and temperatures.īut we can also change film’s sensitivity during development to suit our photographic needs or to create a specific look. Film ISO is determined by the manufacturer for optimal performance.
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