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Interesting observation...
The 85mm prime according to Astrometry.net gives a 15 x 10 deg FOV with the Canon 1000D.
While studying the FOV around Antares I notice there are spectra recorded from stars ( eps Sco and Mu1 and 2 Sco) obviously well outside this 15 x 10 deg field.
This infers that the coverage of the 85mm prime lens is close to 34 deg!!!!!
Just need a bigger sensor chip!
The attached screen dumps from CdC show the field of view and coverage.
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