With SkySafari 6 Plus (with iPad 4th generation & iPhone SE) Basic Encoder System (2048 PPR AMT102 encoders) + Alt-Az Push-To
After star aligning using two stars, the target object can only get as close as 0.5 degrees to compared to eyepiece center. This behavior is less evident for targets close to each other. For example I align the scope using Arcturus & Polaris and then got to Mars and as I align it on iPad screen dead center, it is roughly 0.5 degrees off-center on eyepiece. The Dobsonian telescope I'm using has a mirror 6" f/7 and my eyepiece's focal length is 24 mm.
Also I have some other questions which I couldn't find answers in online documentation:
- How critical is selecting the exact coordinates of the observation site in Location? Would a few miles / kilometers in approximation make a difference in pointing accuracy? I'm using my AMT-102 encoders in their maximum resolution, 2048 PPR, ALL 4 DIP switches are OFF
- What is the function of Push To menu item in Scope menu?
- What is the proper way of aligning a Alt-Azimuth push-to Dobsonian telescope using 2 stars so that it may stay consistent with the SkySafari's navigational window throughout the observing session. I've assumed just start with pointing the telescope to the North and make OTA parallel to the ground and connect the scope to SkySafari using WiFi. For precise alignment is a Telrad OK, or should I use a high power eyepiece?