How big a camera must be to catch the whole Sun in one frame?

When doing Solar imaging with a solar scope people usually want to catch the whole Sun in one frame. Depending on the scope focal length a big enough imaging sensor is needed. But how big should it be. Here is a set of sensor diagonals for given (Lunt) focal lengths.

Focal length and a minimal diagonal size of the imaging sensor
400 mm 500 mm 560 mm 800 mm 900 mm 1600 mm
(bit to small)

(on the limit)
(on the limit)

1" 21.43 mm
(on the limit)
Point Grey Chameleon (1/3")
DMK41 (1/2"), DMK72 (1/2.5")
DMK41 (1/2") Atik 320E / Lumenera SKYnyx2-2 / DMK51 (1.1/8") and EV76C560 based cameras (1.1/8") CMOSIS CMV 4000 - Basler Ace acA2040-25gm / Ximea USB 3.0 KAI-4022 - Atik 4000
For other focal lengths / cameras you can use to check if and how it will fit.

Astronomy and Astrophotography, 19 January 2012, Piotr MaliƄski

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