Long ago, Don Tabbutt wrote:
...(snip)
>> Mount the ETX and carefully collimate it to the main
>> telescope with its eyepiece port "up". Attach the guider to the ETX as
>> follows: Unscrew the nose piece from the guider. Unscrew the
>> ring the nosepiece screws into from the guider. Screw the front half only
>> of the #64 T-adapter into the guider. Remove the dust cover from the rear
>> of the ETX. Mount the guider to the rear of the ETX. Be sure it is
>> upright.
(snip)...

I have been experimenting with the 201 and ETX guidescope system, and wonder
if Mr. Tabbutt or anyone else can advise re: the relative merits of the above
setup, which would seem to preclude the use of a Barlow, and mounting the
autoguider using the 1-1/4" nosepiece and a Barlow--I believe in
theory the higher mag would offer some advantages when used with the
f/10 with 6.3 reducer on the main scope. Has anyone had enough experience
with this setup to offer an opinion? The barlow also reduces the brightness,
which is a negative tradeoff, but has guiding in practice been better with
magnif. or without?

thanks,

Don Dillinger
Snohomish Hilltop Observatory
Snohomish, WA
CCD images at <http://ourworld.compuserve.com/homepages/dillinger>

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