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Yep you're right, 5.8 degrees, giving a widest possible field of 11.6 degrees!!
Of course, you really need to do the trig from the edge of the mirror for unobstructed viewing, and on the 8/f6 that means the widest full light field is 1.72 degrees. You get this with a 30mm 68 eyepiece, or a 26mm Nagler. Anything wider than these and you're not getting full illumination.
Cheers,
Jason.
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