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Question about my D70

elec164

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"RE: Question about my D70"

elec164 Silver Member Nikonian since 15th Jan 2009
Sat 13-Oct-12 08:56 AM | edited Sat 13-Oct-12 08:57 AM by elec164

>I'm sure f/8 in astronomy refers to something different to
>the f/8 we refer to in photography. Don't ask me what

Actually it refers to the exact same thing, focal ratio.

Reflector telescopes are usually defined by the clear aperture and f-number, not focal length.

Although with eyepiece projection I believe the effective aperture and focal length will be affected by the eyepiece itself as well as the amount of extension of the slide tube adapter which attaches the t-ring to the eyepiece.

This would be a great question to ask over in our Astrophotography Forum where Neil (moderator and very knowledgable on this) will more likely see it and give you a more precise answer.

Pete

Pete

Visit my Nikonians gallery.

A general, generic topic Question about my D70 [View all] , autoexer Silver Member , Wed 10-Oct-12 08:32 PM
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