Response to hp5 forced to 6400 with d76

First, you will not really get iso 6400. You will get ei 6400, which means a hopefully acceptable image when your exposure meter is set to 6400. Exposure lattiude will be tiny. Subject contrast will make a big difference. Start with 2-3X your normal development time. Use a higher processing temp to save time. You will have to test and adjust. No one can give you some magic time that will make images acceptable to you. It would help to use a speed increasing developer like Microphen, DDX or Acufine.

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