Hullo Oriecat,
The wonderful thing about traditional B&W photography is the variety of opinions and working methods it encourages.
I read above that one contributor is very happy with Delta 100 in Rodinal and that is all part of the rich fabric of life.
However my tests show that Delta 100 in Rodinal produces a J shaped exposure-density curve leading to depressed mid tones and over dense and contrasty highlights.
For reliable results in a wide range of conditions, true speed 100, fine grain, excellent sharpness and a friendly S shaped exposure-density curve, try Xtol 1+1, 11 minutes at 20 degrees C.
Happy photography
AndrewS