ISCO Iscovitar 50/2.8: Samples [3] - FF - f/2.8 + close focus (helicoid) adapter

Camera: Sony a7c (FF, 24MP)

Lens: ISCO Iscovitar 50/2.8 at f/2.8 

The close focus (helicoid) adapter was used instead of the built-in focusing mechanism. This reveals the true nature of the triplet.

See also related notes:

• ISCO Iscovitar 50/2.8: Samples [2] - FF - f/2.8 - Two types of focusing (2026-04-23)
• ISCO Iscovitar 50/2.8 (M42x1/45.5): Triplet with simple focusing mechanism (2024-05-21)
• Noname Leica M-Sony FE/E close focus (helicoid) adapter (2023-07-30)

Image albums:

• ISCO-Göttingen Iscovitar 50/2.8