Quote:

---

If you do a good drift alignment, you should be able to go 2 minutes without guiding.

---

I think that's a bit unrealistic for a stock Atlas and a 1200mm focal length. Typical periodic error of the Atlas is 15 to 20 arc-seconds peak-to-peak, and with the Sony Alpha 350 on a 10" f/4.7, the resolution is about 0.9 arc-seconds per pixel. Guiding will be mandatory at that focal length for anything over 30 seconds due to PE, regardless of the polar alignment accuracy.

--------------------
Don
----------
Atlas EQ-G
Orion 8" f/4.9 newtonian
Orion 127mm Mak-Cass
Orion Skyview Pro mount
Orion 80mm guide scope
Canon Digital Rebel XT
Meade DSI
Philips SPC 900 NC webcam

Post Extras