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Eyepiece viewing field, question from a rookie
Hi,
I'm trying to calculate the field of view in minutes of arc for my telescope(reflector)/eyepiece combinations. I have this formula (from the Sky Charts manual); Magnification = telescope focal length / eyepiece focal length Viewing field (in degrees) = eyepiece apperent filed of view / Magnification Viewing field (in minutes) = Viewing field (in degrees) * 60 This gives me a viewing field of 12 minutes with my 1000mm focal length telescope and my 6.5 mm/30degree apperent view eyepiece, could that be correct? If I add my Barlow lens (2*) will that give a viewing field of 6 minutes with the above combination? cheers, Hans |
#2
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Eyepiece viewing field, question from a rookie
This gives me a viewing field of 12 minutes with my 1000mm focal length
telescope and my 6.5 mm/30degree apperent view eyepiece, could that be correct? Yes, that's correct If I add my Barlow lens (2*) will that give a viewing field of 6 minutes with the above combination? Correct again. |
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