Date Posted: 10/7/21
Date Taken: 9/6/2021, 9/7/2021, 9/9/2021, 9/10/2021
Scope: Stellarvue SV80ST-25SV APO with SFF6-25 flattener, f/6, 480mm
Camera: QSI 583wsg with Astrodon Tru-Balance E-Series Gen2 filters
Temp: -15C
Mount: Losmandy G-11 Gemini
Guiding: Starlight XPress LodeStar, Orion ST80 guide scope, 480mm.
Exposure: LRGB 340:185:165:170. Luminance unbinned, 10min; RGB unbinned, 5min.

Calibrated and Stacked with CCDStack2; RGB combine and DDP with MaximDL. Processed with CS4.

First light image with the SV80 scope! The compression ring fitting on the Megrez90 would frequently loosen when the temperature dropped, and I didn't want to risk the camera falling. I purchased the scope from Vic Maris himself at NEAF in 2016. It took me until now to actually use it.

It has been a while since I worked with the QSI camera, and at this focal length. The QSI is far less noisy than the STL1000. To wit, I did no hot/cold pixel processing, and NO NOISE REDUCTION on this image. I chose M33 because it is a known quantity; The Megrez90 shot from 2013 can be found here: https://jsokol.zenfolio.com/p787437366/h131bff0e#h131bff0e

There are two versions, one un-cropped, and one cropped and rotated.