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FOV Indicator calculator disagrees with

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I've noticed that the result returned by the solver returns a "size" value that is exactly double the results returned by KStars FOV calculator. I've looked at other tools and they would appear to confirm's solution FOV.

Am I misinterpreting the solution, or is there some other discrepancy here? I've checked and re-checked that I'm properly entering objective diameter, focal length, etc.

From the picture, the values returned by appear to be correct. For a 400mm focal-length f/2 200m Canon lens, attached to a ZWO ASI294MC (4144 x 2822 w/4.63um pixels) ... #annotated

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