gavinlg
Veteran
????????
I have one of these and I use it for Digital and film and love it!
In fact I just tested mine on two different bodies out of curiosity and it reads a grey card the same as my Sekonic L308s at f2 and f1.4
I think he's referring to wide open optical performance rather than actual light transmission performance...
The cool thing about Zeiss is that they made two 50s - one that's deadly sharp wide open and another that's a character lens wide open. Best of both worlds.