Quote Originally Posted by Jerry Thirsty
.......with each lens set at around f/11 or so. The Componon-S and Apo-Rodagon were virtually indistinguishable .......
If you are using an Apo-rodagon, and I assume in one of the more common focal lengths, like 50 - 150mm, you are defeating their optical advantage by using them at f11. It is my understanding that the APO-Rodagons are optimised at one stop from wide open, which would be f 5.6 for most of them.
An APO-Rodagon at F11 may not be noticeably better than most other enlarging lenses when all are compared at f11, which is optimum for the non APO-Rodagons but not for the Apo.