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AFOV of DTL40829

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Old Sunday 10th February 2019, 19:24   #1
baz1973
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AFOV of DTL40829

Hi,

Quick question, does anyone know what the AFOV is of the DTL40829, the low mag eyepiece with lots of eye relief?

Many thanks!
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Old Monday 11th February 2019, 23:02   #2
jring
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Hi,

part number 40829 is an older adapter ring...

https://www.optiline.no/opticron-oku...pter-mm2v1-hrz

I guess you mean 40929 which is a 42mm EP for which no afov given, but with the eyelens diameter of 31mm and eye relief of 38mm from

http://opticron.boson.posiweb.net/Pa...-eyepieces.htm

we get sth between around 40 deg for a pupil size of 3mm - formula from

http://www.mira.org/ascc/pages/lectures/fabform.htm

If you use larger sensors, you have to take the sensor diameter instead of the pupil size.

Joachim

Last edited by jring : Monday 11th February 2019 at 23:08. Reason: corrected faulty math...
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Old Tuesday 12th February 2019, 20:06   #3
baz1973
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Thanks Joachim, that was the one I meant! Thanks for your detailed reply.
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