Quote:
Originally Posted by julianh72
A computerized AltAz will tracks stars fine for visual use, but you will get "Field Roattaion" http://www.celestron.com/support/kno...and+imaging%3F which means that for long exposures, all stars will leave curved star trails around the centre of the image. For long exposures, you NEED an equatorial mount, and preferably with an auto-guider set-up attached. |
Thanks Julian. This makes sense now. What would the maximum exposure time realistically be for an altaz? I realise the answer to that probably depends on your magnification as well hmmm