Re: Alignment without Polaris?
Just keep in mind that old fashioned drift alignment takes an excessive amount of time whereas an ASPA iteration takes very little time. There are tools that can help with drift alignment such as PHD2 and possibly BYEOS. I believe those work quicker but I have not used them so maybe others can chime in on how long a drift alignment takes. Of course if you decide to use PHD2 drift alignment you need an autoguider.
If you put your mount always in the same position (for instance with stretched legs on marked pavers or tiles) you may only have to polar align once so long as you don't touch the Alt/Az controls. So long as you are within, say, 30' the autoguider will take care of the resulting tracking errors. ASPA will definitely get you within that accuracy, probably a whole lot better if you iterate a few times. BTW most of the work with ASPA is not ASPA itself but the 2 star alignment (with 3 calibration stars) that precedes ASPA. You must do that alignment at least once anyway, of course.
If you can manage to place your mount back accurately in the same position each time and use the "Last alignment" option you may be able to save yourself a lot of work. If you can manage to maintain the PA that way you should be able to do a quick one star align in case the "Last alignment" option does not work well. I like the Celestron software and hand controller interface very much. I cannot compare with other brands based on experience but I heard the same from others who can.
Clear skies, Henk. Telescopes: Carbon fiber ES ED127CF, Zhumell Z12, Coulter Odyssey 10, AT6RC, Venture RX-7, Celestron Skymaster 20x80, Mounts and tripod: AVX, LXD55, Tiltall, Cameras: Canon (SX40, 450D, 350D, ELPH 100HS), Samsung NX100, DIY: Dob and camera barndoor trackers, afocal adapter, foldable Dob base with leveling feet, Az/Alt setting circles, Accessories: Counterweight bar attachment, Plossls, Barlows, Telrad, SSAG, laser collimators (Seben LK1, Z12, Howie Glatter), Cheshire, 2 Orion RACIs 8x50, Software: DSS, ImageMagick, PHD, Nebulosity, Photo Gallery, Gimp, CHDK
To view links or images in signatures your post count must be 5 or greater. You currently have 0 posts.