>
> On Wed, 16 Aug 2000, Assaf Berwald wrote:
>
> > Greg I tried to center a guide star with an old
> 12mm reticle...but I
> > guess its not the one that was mentioned on this
> list before. As to
> > the 9mm...if you mean the EP with the adjustable
> cross-hair- we also
> > have it..so Ill try it aswell however...I started
> thinking about
> > autoguiding with our old ST-6, its a camera that
> we used long ago for
> > imaging, and I hope it'll b usefull as an
> autoguider. p.s if you think
> > I should stick to the 201xt please let me know so
> Ill go the right
> > direction. thanks a lot for the help so far! Assaf
>
> Good morning, Assaf,
>
> The question of whether or not to stay with the
> 201XT is not such a simple
> question. If you're using a guidescope for your
> guiding, I can say from
> experience that the 201XT will work excellently.
> (Check the archives for
> more hints on using the 201XT with a guidescope.)
> It's important, though,
> to have sufficient aperture to get bright enough
> guide stars. (Mine is an
> 80 mm f/11.4 Celestron refractor and I wouldn't
> recommend any less
> aperture.) The 201XT isn't cooled so requires
> brighter stars than other
> guiders. However, I've found that if you can see the
> guide star in the
> guidescope, you can guide on it using the 201XT.
>
> If you're using an OAG, an SBIG guider would be a
> better choice. The
> algorithms used in the SBIG guiders are much more
> advanced than those in
> the 201XT. SBIG guiders use intensity information in
> many pixels
> surrounding the maximum brightness pixel to compute
> the centroid of the
> image brightness, effectively providing sub-pixel
> resolution. The 201XT
> does not have the processor power to do this and (as
> far as I know) relies
> on finding the brightest pixel only. The bottom line
> is that the SBIG
> guiders are much better at locking onto the comatic
> star images that are
> typically produced by OAGs.
>
> Yes, that's the correct EP. Don't forget to make
> sure you center the cross
> hairs on that 9 mm illuminated reticle EP before
> using it to try to
> acquire a guide star for your 201XT! BTW, I've found
> that with my 80 mm
> f/11.4 guidescope, a star of about magnitude 2 will
> just about swamp the
> detector, giving me brightness readings around 99
> with an exposure of 0.1.
> Adjust your expectations accordingly.
>
> I hope you've followed Ralph's advice about making
> sure the 201XT really
> is working. The flashlight test is a very useful
> trick and it really is
> possible that you got a dud, you know.
>
> Regards,
>
> Greg
>
> Greg
first of all, thanks a LOT for all this, it sure will
help me.
As to the ST-6, as far as I know, the wire needed for
autoguiding runs from the ST6 relays-box (the "relays"
socket) to the lx200 "CCD" socket.
is this correct?
Also, can you, or anyone else, specify the wiring
needed in that wire?
I only know it has 15 pins holes on the relays-box'
end and it might have 4 pins on the phone-type end(Im
not sure about that) I have no idea of what is te
correct wiring needed.
thanks again!
Assaf




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