[sbogar]

I measured the vignetting of the Zeiss 1.8 lens. For a 24 x 36mm format sensor, 52% of the light is received at the edges

along the long side, and 39% is received in the corners (that is, 48% of the light is lost at the edges, and 61% in the corners).

 

I did the measurements with a 39mm x 39mm sensor, and vignetting on this larger format chip is: 51% at the edges (center line),

and 19% in the corners.