Re: WO/Apogee SCT Crayford focuser differences?

From: Stephen Paul (spaul219_at_hotmail.com)
Date: 07/31/04 

Date: Fri, 30 Jul 2004 22:59:42 -0400

"Jon Isaacs" <jonisaacs@aol.com> wrote in message
news:20040730122807.05881.00002925@mb-m05.aol.com...
> >When
> >you think that you can go from attaching a camera, directly to the rear
> >port of the scope, through to having a setup, like Crayford, filter
wheel,
> >focal reducer, spacer, then camera
> >there is no other scope design, that
> is better, with a similar range of focus, and such a small number of
> optical surfaces.
>
> A couple of thoughts:
>
> 1. I guess thats why someone nicknamed his SCT "the gadget." While no
other
> scope design has the ability to mount so many different accessories, no
other
> design needs so many, motor focusers, mirror locks, dew shields/heaters,
the
> stuff you mentioned..
>
>
> 2. Focal reducer and Crayford are only necessary because of the SCT
design.
> While a Newtonian might need to have the mirror moved and a Paracorr if
> desired, the only other items required would be the filter wheel and
camera.

A couple more thoughts:

1) At only 13 lbs and 16 inches long, an 8" SCT is easy to mount.

2) With it you can do CCD at F3.3, and CCD and Film at F6.3, F10 and beyond,
with a few easily attached adapters.

3) The crayford and mirror lock are hardly necessary.

4) The primary advantage of the SCT... see #1 and #2.

Relevant Pages

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