The massive Rodenstock TV-Heligon 50mm f/0.75 attached to the tiny Nikon Z30 with my home-made adapter allowing focusing all the way to infinity. The image circle projected by the Rodenstock and the similar Oude Delft Rayxar 50/0.75 almost completely fills the DX format of the camera

The main issue(sic) is that these lenses, now mounted to allow infinity focus, will have their super fast f/0.75 aperture manifested. Thus, the max. 1/4000sec speed of the Z30 is far exceeded in broad daylight even at the lowest ISO 100 setting. Hence I now have added a filter thread to the lenses to allow using a polariser or ND filter to bring exposure within the feasible range!! A luxury problem I'd guess.

2023.03.01 Nikon Z30 med adapter for Rodenstock TV-Heligon og liknende objektiver ("røntgen"-objektiv). ©Birna Rørslett-NN/Nærfoto < U20230301224024 U202303 U2023 20230301224024 202303 UTSTYR/TEKNIKK/FOTOGRAFER, DIGITALBILDE> 1.3 MB IMAGE 03.03.2023 12:37:30 GPS UTM:PM,PM25,PM2550,PM251500 [samsung SM-A530F, Samsung 3.9 mm f/1.7]

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Make:	samsung
Model:	SM-A530F
Exposure:	0.04 sec (1/25)
Aperture:	f/1.7
ISO Speed:	320
Focal Length:	3.9 mm