"At what point have others found it worth switching to the higher speed, more grainy emulsions?"(posted 8725 days ago)If grain's the thing when you go fast, Bob, I'd stick with HP5+. Both D3200 & TMZ are significantly worse from that perspective, even @ EI 1000. I was shocked at how restrained the grain in HP5+/HC-110 was.
If you need a less steep contrast curve at EI 3200 & 1600, go with D3200. TMZ is a great film @ EI 1000 if you want grain, but begins to suck as you push it -- by 3200 it's not very good. (It has a great "look," though.)
I'm a D3200/Rodinal user for the next year at EI 1600, after my tests, but I wanted grain.
Telling us how you meter when you're shooting in low light might be helpful, by the way. Are you exposing for the shadows or just placing what's important at Zone V or VI and letting the highs and lows fall?