OSLO model  courtesy from Miryam:

24 mm × 36 mm coverage:

11 mm × 11 mm coverage (IMX533 sensor):





The radius of the diffraction-limited flat field is about 0.5° (or 3.9 mm) at 550 nm (= twice the apparent radius of the Moon,  smaller than the size of the IMX533).

OSLO model by Vlademir Sacek
https://www.telescope-optics.net/commercial_telescopes.htm#even

The radius of the diffraction limited flat-field is about 0.4° (= 4 mm)