Re: [ATM] Focuser, Derotator, Off Axis Guider

["Don Clement" <clement.focuser@verizon.net>]

> I think it should be possible to build a focuser with integrated
> off axis guider. The the guider doesn't need additional backfocus.
> If a derotator is already there I could seek for a guide star
> by rotating the whole focuser instead of rotating the OAG alone.
>
> The focuser housing around the tube must be open to one side to
> allow the second tube of the OAG to be mounted.

One solution is to pair one  of my ultra-low profile focusers of just 1" or
25mm with the field de-rotator in front of the focuser so that the entire
focuser rotates. I have been working on a large aperture ( 4" ,100mm) low
profile de-rotator with a 1" (25mm) profile. The de-rotator focuser
combination has a minimum profile of 2" or 50mm. An extension tube  for
visual is not needed as focuser travel is 1.5". A clear aperture of 4" with
2"  total profile is possible using the 4.25" aperture focuser and 4"
de-rotator.

Don Clement
Running springs, California

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