|
G'day Gustavo,
Yes, generally tracking platforms are not ideal for long exposures. HOWEVER..., I have an 8" collapsible dob for which I built an equatorial platform and then later purchased a Skywatcher goto dob mount. The EQ platform worked very well for visual use, holding DSOs in the centre of the field for up to an hour. Likewise, the goto mount seems to be just as accurate without the need to reset the base at the end of its travel. The problem with imaging with a tracking AZ mount is the rotation of the image field that doesn't occur with an equatorial (GEM) mount, and which prevents you from stacking the images. I was advised very early in the piece, that if you want to get involved with imaging, be prepared to spend lots of money, don't expect to do it on the cheap!
That said, I can get quite reasonable planetary pics with my webcam.
|