Yes, I have developed the film at 20 C.
Originally Posted by pentaxuser
I usually end up with rather short development times, compared to other users, when using Rodinal or R09 – so you might want to prolong development a bit. On the other hand – longer development can result in more fog…
You should also bear in mind that I don’t know what EI my father used when he exposed the old films I have developed. I know for a fact that he did not use a light meter (apparently he did not need one. He has left an archive comprising of thousands of very well exposed Kodachrome slides from the sixties and seventies). However, when he taught me the basics of B&W photography he advised me to base my exposures on the shadows and that it is usually better to use a lower EI than the stated speed of a B&W film. I can only presume that he followed his own advice.