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412Re: [William-Optics] Re: GT-ONE tracking tests

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  • cshinn
    Feb 1, 2001
      The audience is hungry for photos...Yummmm.....Chuck




      | I recieved my mount tonight. WOW is all I can say. Setup was fast but
      | I am currently drilling so that I can mount my scope on it and
      | hopefully by tommorrow night I can give a report of tracking. I am
      | also putting it on a permanent pier. I hope to have that done by
      | tommorrow night too. later.
      |
      |
      |
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      |
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      |
      |
      | --- In William-Optics@y..., "Ron Wodaski" <ronw@n...> wrote:
      | > Test 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.
      | >
      | > Ron Wodaski
      | > The New CCD Astronomy
      | > http://www.newastro.com
      | >
      | > -----Original Message-----
      | > From: evang@d... [mailto:evang@d...]
      | > Sent: Thursday, February 01, 2001 11:57 AM
      | > To: William-Optics@y...
      | > Subject: [William-Optics] Re: GT-ONE tracking tests
      | >
      | >
      | > Rod:
      | >
      | > 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?
      | >
      | > OTA
      | > focal length of setup etc.
      | >
      | > Thanks
      | >
      | >
      | >
      | > In William-Optics@y..., "Ron Wodaski" <ronw@n...> wrote:
      | > > I had a few hours of not quite clear skies last night, but I was
      | > able to
      | > > image with the CCD camera through the fog. I mis-aligned the GT-
      | ONE
      | > from the
      | > > pole in order to get a picture of how well it tracks. One is
      | looking
      | > for a
      | > > nearly straight curve that shows smooth periodic error. Although
      | > only the
      | > > size of periodic error is frequently quoted in mount specs, the
      | > speed and
      | > > frequency at which it varies are critically important.
      | > >
      | > > The bottom line: the GT-ONE has excellent tracking
      | characteristics.
      | > Here is
      | > > a link to an image that shows the mount's tracking over a 6-minute
      | > interval.
      | > > I took 15 images, pointing at various places in the sky (just in
      | > case!), and
      | > > they all look just like this (253k file):
      | > >
      | > >
      | http://www.buytelescopes.com/manufacturers/wyo/images/gt1_track.jpg
      | > >
      | > > For a cropped image showing just a couple of star trails (25k):
      | > >
      | > >
      | >
      | http://www.buytelescopes.com/manufacturers/wyo/images/gt1_track_crop.j
      | > pg
      | > >
      | > > For a rotated image showing the star trails horizontal (10k):
      | > >
      | > >
      | >
      | http://www.buytelescopes.com/manufacturers/wyo/images/gt1_track_rotate
      | > .jpg
      | > >
      | > > (If the links break onto two lines, you'll need to cut and paste
      | > into your
      | > > browser's address line to see these.)
      | > >
      | > > The GT-ONE trails are about twice as good as other mounts in this
      | > price
      | > > range. These results are actually better than many mounts costing
      | a
      | > lot more
      | > > money. <g>
      | > >
      | > > I'll need to use a longer focal length to do definitive tests, but
      | > more
      | > > important than the magnitude of the PE is the extreme smoothness
      | of
      | > the
      | > > curve -- an autoguider could guide the GT-ONE at very long focal
      | > lengths
      | > > with a tight, smooth curve like this. Compare the GT-ONE star
      | trails
      | > to
      | > > those of an over-$3000 mount that must remain nameless (taken with
      | > same
      | > > scope and camera):
      | > >
      | > > http://www.buytelescopes.com/manufacturers/wyo/images/compare.jpg
      | > >
      | > > Note that PE is significantly larger, and much more erratic. The
      | > latest
      | > > changes to the motor mounts are extremely successful, and show off
      | > the full
      | > > capabilities of the high-quality gears in the mount. This is not
      | > empty hype;
      | > > I'm getting one of these mounts for my personal use and expect to
      | be
      | > imaging
      | > > with it extensively. Those of you who know my work know that I am
      | > about as
      | > > picky as you can get when it comes to mounts.
      | > >
      | > > Ron Wodaski
      | > > The New CCD Astronomy
      | > > http://www.newastro.com
      | >
      | >
      | >
      | > To unsubscribe from this group, send an email to:
      | > WYO-unsubscribe@egroups.com
      |
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