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Yes what you have is pretty close to what I calculated.
I haven't seen that formula that you used before.
The formula I use is, 206.3 / Focal length(mm) gives you arcsecs per micron.
So for a 1000mm focal length that would be 0.2063 arcsecs per micron.
You can then multiply 0.2063 by your pixel size to give arcsecs per pixel.
Or multiply 0.2063 by the width of your sensor (in microns) 22,300 * 0.2063 = 4600.49 arcsecs or 76.67 arc mins.
Or multiply 0.2063 by the height of your sensor (in microns) 14,900 * 0.2063 = 3073.87 arcsecs or 51.23 arc mins.
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