100% crop- did not see the Spider until I downloaded the DNG file.
1934 Carl Zeiss Jena 5cm F2 Sonnar, Y2 filter, on the Leica M Monochrom. This is the lens that the new Bertele Sonnar is based on.
This one is converted using a tabbed J-8 focus mount, modified for 0.75m close focus.
I'll be comparing the two Sonnars when my Bertele Sonnar arrives.