Re: Telescopes for astrophotography


"Mark S. Holden" <mark@xxxxxxxx> wrote in message
news:TcKdnXgDM-_CaZ7eRVn-jg@xxxxxxxxxxxxxxx
>
> For time exposures, the mount will be a significant factor. You'll want
> an equatorial mount with provisions for talking to an auto guider.
> (You'll want an autoguider for exposures longer than about 2 minutes)
>
> As for the type of telescope, I like apo refractors for deep sky
> photography. No central obstruction, and the faster F ratios cut down
> on the exposure time. I like them for planets too, but you need a
> monster to get a good image scale.
>
> The D70 is good for the Moon, but you're likely to prefer a webcam for
> planets. (The web cam can be used with a laptop to create your
> autoguider for deep sky)

Ok, with an eq mount I understand polar alignment and tracking. And I think
I understand the concept of autoguiding but I don't know technically how
it's done.

Does the software pick a couple of stars out of the frame and then somehow
automagically try to keep them in the same spot on the frame? And I've seen
mentions of manual guiding. How would one go about manually guiding? Seems
like that would be a difficult proposition.

Greg


.

Relevant Pages

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