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Photo Forum / Film Photography / Darkroom / May 2004Phenidone Extended Developer
OK I'm looking at some "alternative" processes on the PhotoFormulary site. It says Phenidone Extended is capable of 15 to 20 stops of exposure range. When would I need this? and how do you print 15-20 stops on paper? Is it just giving me more choice as to what area I'm going to print? Is this strickly large format formula or does 35mm and medium benefit from this too? Thx. Oh and what kind on negative do I use this with? > OK I'm looking at some "alternative" processes on the PhotoFormulary site. > It says Phenidone Extended is capable of 15 to 20 stops of exposure range. > When would I need this? and how do you print 15-20 stops on paper? Is it > just giving me more choice as to what area I'm going to print? Is this > strickly large format formula or does 35mm and medium benefit from this too? > Thx. Oh and what kind on negative do I use this with? Doesn't sound like an "alternative" process, more like a POTA -like developer for wide range lighting or contrasty materials. What's a POTA? > > OK I'm looking at some "alternative" processes on the PhotoFormulary site. > > It says Phenidone Extended is capable of 15 to 20 stops of exposure range. [quoted text clipped - 5 lines] > Doesn't sound like an "alternative" process, more like a POTA -like > developer for wide range lighting or contrasty materials. POTA is a very, very soft working developer that can be used to get a full range of continuous tone gray scale from very contrasty films like microfilm. It is extremely simple: phenidone, sodium sulfite, and water. It is prone to streaking and mottling if not properly agitated. David Foy > What's a POTA? > [quoted text clipped - 10 lines] > > Doesn't sound like an "alternative" process, more like a POTA -like > > developer for wide range lighting or contrasty materials. P.S. Right or wrong, I consider anything that's not D-76 "alternative". ;^) > > OK I'm looking at some "alternative" processes on the PhotoFormulary site. > > It says Phenidone Extended is capable of 15 to 20 stops of exposure range. [quoted text clipped - 5 lines] > Doesn't sound like an "alternative" process, more like a POTA -like > developer for wide range lighting or contrasty materials. You would need it when there were extreme light values in the shot. These developers were originally designed to photograph explosions with fairly normal film. Sometimes you run into situations which require N-4 or N-5 development, such as a brightly sunlit wall illuminating an interior by reflection, where there is detail in both the shadows and the highlights. This sort of developer is useful there. The other place where it is useful is when you need low to normal contrast with inherently high contrast film, such as Kodak Technical Pan. > OK I'm looking at some "alternative" processes on the PhotoFormulary site. > It says Phenidone Extended is capable of 15 to 20 stops of exposure range. > When would I need this? and how do you print 15-20 stops on paper? Is it > just giving me more choice as to what area I'm going to print? Is this > strickly large format formula or does 35mm and medium benefit from this too? > Thx. Oh and what kind on negative do I use this with? |
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