Date Taken: 9/19/2017, 9/23/2017, 10/19/2017, 10/20/2017
Scope: Planewave CDK 12.5 f/8, 2541mm
Camera: SBIG STL-11000 with Astrodon Tru-Balance E-Series Gen2 filters
Temp: -15C
Mount: Losmandy Titan
Guiding: On-axis via ONAG-XM and SX UltraStar at 2541mm; FocusLock real-time focus software.
Exposure: LRGB 140:105:85:85 All subs 5 min. Luminance unbinned, RGB binned 2x2.
Calibrated and Stacked with CCDStack2; RGB combine and DDP with MaximDL. Processed with CS4.
This is my first light photo using the ONAG-XM/SX-Ultrastar, and focuslock. I was refining the focus over the course of this image, so it wasn't as good as it could be to start with. I was also refining the scope balance, so tracking wasn't as good as it could be to start.
Despite that, the FHWM values are smaller than in previous images. The stars appear to be smaller, but a bit fuzzier, than previous images.
Previously, I used 2-4 second exposures for guiding. For this image I started at 4 seconds, but had moved up to 10 seconds by the end, as I refined the scope balance. I am hoping the 'fuzzy' aspect improves as I continue to refine the balance and tracking.

I stretched this image pretty aggressively to bring out several faint areas of nebulosity in this image.