Hi Eric,

There was a lot of talking about this topic on the SBIG list on the
past week. I read most of them and my conclusion is this:
If you are using a SCT you will need the off-axis guider. These SCT's
have a mirror shift in long exposures that a guidscope can't correct.
In addition, an ETX guidscope will have its own mirror shift and it
would not be a good solution.

I think that a guidscope is only good for tracking comets or
asteroids. If you need it only for deep sky, I think you should go for
an off axis guider.


On Wed, 29 Dec 1999 19:56:23 -0800, you wrote:

>Off Axis or Guide Scope???
>
>I have been taking pictures (35mm Camera eyepiece projection) with my
>scope for the past six months. I have taken some good moon and
>planetary photos. I am currently struggling with deep sky objects (long
>exposures). I recently bought a Meade Super Wedge and have been taking
>10-15minute exposures. These look much better than they did wiithout
>the wedge (no rotation), but there is still the need for imporvement and
>the desire for longer exposures.
>
>After reading through past posts in this group it looks like the only
>way to imporve is to get a guidescope or off-axis guider. It sound like
>the guidescope gives you the most flexability, but that it may not be as
>simple to use as the off-axis guider?
>
>I am thinking about buying the meade #777 off axis guider to start out
>with and then go for a guidescope. Does this make sense or am I just
>wasting my money?
>
>I have seen a lot about the Lumicon Giat Easy Guider. Is it that much
>better than the meade?
>
>Finally, any recomendations for a guidescope? Used Meade ETX90, Orion
>80mm Refractor???
>
>I have learned a great deal reading all of your posts over the past
>couple of months. Thank you very much.
>
>BTW: The Mars Polar Lander thing was all my fault.
>I took the day off from work to watch the landing. :)
>
>
>
>


Best regards,
Moran Nachshony
http://www.geocities.com/CapeCanaveral/Galaxy/9700/

Givatayim observatory and
Israeli Astronomical Assossiation (site in Hebrew)
http://astronomy.org.il

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