Re: [APML] New images

["Bradley Hope" <bradley@thorngarden.net>]

Morning, Zoe;

Eyepiece projection places a regular eyepiece between the telescope and
camera (minus the camera lens) giving a higher power (longer focal length)
and a reduction in the speed of the telescope which is f/10 at prime focus
(for LX90). Depending on which eyepiece  you use, anywhere from 26mm on down
(32mm and longer has too large a barrel to fit into the teleprojection
adapter in spite of what OPT's info says) you'll get different focal lengths
and focal ratios.

You can go here for more information...

http://www.optcorp.com/cart/ProductDetail.asp?PR_ProductID=648

Bradley

----- Original Message ----- 
From: "Zoë Mcenery" <zmcenery@yahoo.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Thursday, November 06, 2003 7:07 AM
Subject: Re: [APML] New images


> Bradley,
>
> You say you took those pics of Saturn at 1 sec at f/63 (15mm eyepiece
projection)
>
> 2 questions, what is an eyepeace projection, and how do you get f63?? what
type of lense is
> that???
>
>
> Zoe
> Edmoton, Alberta

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