Response to 'newbie' question--what film best for 800ISO, grain, sharpness, tonality

> sodium sulphite decrease sharpness?

25g/L isn't enough to have any visible effect on sharpness.

I'm currently using 20g/L sodium sulfite for HP5+ in Rodinal 1:50; I've used up to 50g/L with no visible effect that I've been able to see even with a 30X magnifier.

What it does is raise the EI for that combination to EI 320 rather than EI 200 for the same CI.

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