Another try on NGC6888 - Crescent Nebula

[Daniel Karl]

I'm still experimenting wildly with completely new mount, scope, camera, guide system and processing.


Still not sure where I am with the telescope. There's definitely tilt and backfocus issues with the reducer to address.

IOptron CEM 70 guided with ASI120MMMini on Skywatcher 9x50 finder
SET Optics CF - 130 Triplet APO f/6.6 with 0.79 TS Photoline reducer flattener
ASI294MM-Pro with ZWO 7nm HSO filter set
manually focused and controlled via ASIAir 
40min Ha - 20min SII - 20min OIII (120s subs) combined to weighted SHO.

 

All from Bortle 8 London - there's definitely room for improvement on all fronts
First the reducer, then more exposure time, then a lot of stuff to figure out about the processing.

 

[symmetal]

For only 80mins that's pretty good. 🙂 As you say there is some tilt left to right, possibly the focuser drooping slightly when the scope is 'on its side'. Check there is no play in the focuser parallel to the camera's long axis.

Alan

Edited June 24, 2021 by symmetal

[geeklee]

There's a lot of really nice detail in there @Daniel Karl  Given sky conditions and filter integration, the Ha is taking centre stage but you can start to see that OII just coming through - definitely one to add more too if you get a chance.  As @symmetal says, there's a lot to enjoy for 80 minutes.