This is my comparison of the Pentax K 30/2.8 at f/2.8 and the Pentacon 30/3.5 at f/3.5 on the Sony a7c camera (FF, 24MP).
The scenes changed a bit because of the wind.
1.
(Pentax 30/2.8)
(Pentacon 30/3.5)
2.
(Pentax 30/2.8)
(Pentacon 30/3.5)
3.
(Pentax 30/2.8)
(Pentacon 30/3.5)
4.
(Pentax 30/2.8)
(Pentacon 30/3.5)
The Pentax K 30/2.8 gives a wider field of view.
The difference between f/2.8 of the Pentax K 30/2.8 and f/3.5 of the Pentacon 30/3.5 is about 2/3EV (as expected).
See also related notes:
- Pentax K 30/2.8: ad (2023-09-15)
- Pentacon 30/3.5 (M42x1) (2023-05-01)
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