Exchange your ideas about the various Rollei 35mm SLR cameras. Including the 2000 and 3003 series. Excluding the classic Rollei35 which has it's own forum.
a) it is a lens for Rollei QBM and it does fully support SL 2000 F / 3003
b) it is not a "Macro lens", just a zoom with somewhat close fucusing
c) the white knob is the red dot even working in the dark (index for lens mounting)