Rodinal is easy the higher the dilution the higher the compensation effect. 1:25 little compensation lots of pop, 1:50 a little more compensation a bit less contrast than 1:25, 1:100 lots of compensation little pop. Agfa usually advises the 1:50 dilution. On Overcast days I would prefer the 1:25 dilution as it adds some significant snap to the picture for general use 1:50.