I used my new (second hand) Sigma 18-35mm f/1.8 lens for the first time. It was foreseen with a dew heater as ambient temperature was about -5°C.
Objective was capturing Barnard's loop with H-alpha filter and ASI2600MC.
This was my 6th session so far of which one failed.
Polar allignment failed with SharpCap, so no polarallignment was done. With a 300s exposure time, the scope was pretty well alligned :)
Setting:
ASI2600MC with Signma 18-35mm f/1.8 and H-alpha filter (12nm)
Software: SharpCap, APP, CS4 and DeNoise AI
Stacking:
* Session 4: Nikkor 10-24mm f/3.8 H-alpha 23x300s
* Session 5: Nikkor 10-24mm f/3.8 Optolong L-Pro 6x300s
* Session 6: Sigma 18-35mm f/1.8 H-alpha 24x300s
Barnard's Loop or Sh 2-276) is an emisson nebula in Orion. It is part of the Orion molucelar cloud complex which also contains the Orion Nebula and Horsehead. The stars within the Orion Nebula are believed to be responsible for ionizing the loop.
The Barnard's Loop is about 1,400 ly away and 360 ly long. The loop is the result of a supernova about 2 million years ago.
