410RE: [William-Optics] Re: GT-ONE tracking tests
- Feb 1, 2001Test setup: Takahashi FSQ-106 at 530mm, ST-8E camera.
This is my "first order" test setup -- if a mount passes (and I consider
having <10 arc seconds PE uncorrected, and no jerkiness, to be a passing
score), then I will test it with a longer focal length instrument. It's more
work to do the longer focal length tests, and especially when I had only a
few hours of half-clear weather, I wanted the fastest possible setup so I
didn't miss the opportunity.
A C-11 would be a great scope on this mount; I look forward to your reports.
The New CCD Astronomy
From: evang@... [mailto:evang@...]
Sent: Thursday, February 01, 2001 11:57 AM
Subject: [William-Optics] Re: GT-ONE tracking tests
I am one of the five to receive the mount - mine is still with
Anacortes. They are holding onto it so William can make the cold
weather alteration when he arrives tomorrow.
(I will be shooting CCD (MX-916). My setup will be @1760mm (a C-11
with a 6.3 focal reducer). I will be using the Star 2000 to track.)
Could you precisely describe your setup for your tests?
focal length of setup etc.
In William-Optics@y..., "Ron Wodaski" <ronw@n...> wrote:
> I had a few hours of not quite clear skies last night, but I wasable to
> image with the CCD camera through the fog. I mis-aligned the GT-ONEfrom the
> pole in order to get a picture of how well it tracks. One is lookingfor a
> nearly straight curve that shows smooth periodic error. Althoughonly the
> size of periodic error is frequently quoted in mount specs, thespeed and
> frequency at which it varies are critically important.Here is
> The bottom line: the GT-ONE has excellent tracking characteristics.
> a link to an image that shows the mount's tracking over a 6-minuteinterval.
> I took 15 images, pointing at various places in the sky (just incase!), and
> they all look just like this (253k file):http://www.buytelescopes.com/manufacturers/wyo/images/gt1_track_crop.j
> For a cropped image showing just a couple of star trails (25k):
> For a rotated image showing the star trails horizontal (10k):
> (If the links break onto two lines, you'll need to cut and paste
> browser's address line to see these.)price
> The GT-ONE trails are about twice as good as other mounts in this
> range. These results are actually better than many mounts costing alot more
> money. <g>more
> I'll need to use a longer focal length to do definitive tests, but
> important than the magnitude of the PE is the extreme smoothness ofthe
> curve -- an autoguider could guide the GT-ONE at very long focallengths
> with a tight, smooth curve like this. Compare the GT-ONE star trailsto
> those of an over-$3000 mount that must remain nameless (taken withsame
> scope and camera):latest
> Note that PE is significantly larger, and much more erratic. The
> changes to the motor mounts are extremely successful, and show offthe full
> capabilities of the high-quality gears in the mount. This is notempty hype;
> I'm getting one of these mounts for my personal use and expect to beimaging
> with it extensively. Those of you who know my work know that I amabout as
> picky as you can get when it comes to mounts.To unsubscribe from this group, send an email to:
> Ron Wodaski
> The New CCD Astronomy
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