Brush agitation is especially appropriate for larger formats -- the larger the format, the more important even development is, and the more difficult to achieve. Brushing breaks up the boundary layer of developer close to the surface of the film for maximum agitation efficiency. The key is to use a brush of appropriate size for the format-- larger formats require larger brushes -- and to use generously overlapping strokes, in multiple directions. After you do it once, it will be obvious. Also, in case you've misunderstood, the film is submerged in developer during the brushing, which can be constant, or intermittent. With brush development, an over-sized tray is not necessary, so less developer is required. This technique was/is used by astronomers who require absolutely even development. Give it a try!
That makes a lot more sense. Thank you for clarifying. I thought you were talking about brushing on the developer instead of submerging the film. Your description aboove sounds a lot more sane than what I had previously envisioned.
It sounds like everyone else gives a lot more agitation than I do. It's worth a try (on a smaller format first!).
My biggest problem with pyro is the sky... I shot with 11x14 Chamonix and notes grainy sky! HOW IS MY AGITATION: I agitate Max pyro at 70F for 7 mints..
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