Rodinal at 28C!!!

Still feeling my way into B&W developing and have been happy with Delta 100 and Rodinal 1+50. The last 2 films developed were at a water temperature of 28C ( It is 40C outside today) and appropriate adjustments in dev time were made for the temperature. Contrast and tone wise the negs were OK but perhaps a little grainier than usual.

Is this something that is likely at higher temps with Rodinal 1+50?

And another question - what is the effect of minimal agitation vs 'standard' agitation with Rodinal 1+50?

thanks

Never tried it that high. My experience with stand development by Rodinal 1+50 was streaks and unevenness. That was on both 35 mm and 4x5. I reported the experiments some time ago in Photo Techniques in the article "Agitate or Ruminate."

It is my understanding that the higher temperatures will lead to more grain.

Optimum temperature (grainwise) for Rodinal appears to be around 18-20 celsius.

That's a little higher than my temps, which run ~74F - ~80F (~23C - ~27C). I don't see much difference in the range that I use with FP4+ and HP5+ (roll and sheet) but that is not to say that there is no difference, just that *I* don't see it.

As to minimal agitation, I've only used Rodinal 1:200 with stand development. There are visible differences between what I get with 1:50 and 1:100 using 'regular' agitation v.s. the 1:200 stand, but I'm not good enough with the terminology to describe them very well. I would expose the same shot multiple times and develop using the different methods so that you can visibly see the difference yourself. If you are using roll film, just expose the entire roll and then develop parts of the roll using different methods/dilutions (don't worry about cutting through one shot since the entire roll is the same).

- Randy