Sink Development Push/Pull Charts

As I get more organized, I am starting to create some push/pull times for development based on film stock and developer. These calculations are related to developing sheet film in a large tank or tray. Development times for small formats (35mm / 120) will be different. I plan to update with more stocks and chemical recipes as I go. In the charts below, n is the recommended normal development time at 68°F. The +/- of n is the amount needed to push/pull based on the Zone Metering difference between highlights and shadows (roughly 20% per). There are many methods for determining the n and many variances within similar methods. So, you may read many different things on the web. But this is how I have been doing this, and I have been very happy with the results.

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Pulling Ilford HP5 Plus

Ilford HP5 Plus 400 (4x5) is very new to me, but I have heard how well it works with portrait work and how nicely you can push and pull it. This weekend I wanted to put it to the test by shooting a situation where I would need to pull it in development. I ended up shooting a few situations (just three different shots) and developed each sheet differently (ranging from n-0 to n-2 development times), but this turned out to be my favorite example.

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