Response to Infra red ISO?

It depends on where you are. Here in Singapore, I use ISO-1000 (yes, one thousand), meter TTL thru' a 25A filter and bracket by +/-1 stop. Most of the time, the frames exposed at ISO-1000 are bang on. I develop in D76 stock or D76 1:1 at 24-25 deg C. Try starting out with D76 1:1 at 20 deg C for 11-12 minutes - it has always worked for me.

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