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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
1/3"
(bit to small)

1/2"
1/2.5"
1/2"
(on the limit)
1.1/8"
(on the limit)

2/3"
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 www.12dstring.me.uk/fov.php to check if and how it will fit.
RkBlog

Astronomy and Astrophotography, 19 January 2012, Piotr Maliński

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