Horsehead (IC 434) and Flame (NGC 2024) Sh2-277) Nebulae

I got this replacement 107mm f7 scope on 1/18 and had 30 days to test it, so I had to take advantage of the clear skies last night to do that.  I was getting a bit nervous that I wouldn't have clear enough skies to test it before the return period.  (The scope I had to send back had pinched stars when the scope cooled, so I was thrilled to see that this copy of the scope gave me round stars despite the -14 deg Celsius temperature!)

I used it to capture two nebulae.  The Horsehead Nebula glows very bright red in H-alpha and has a very prominent (and iconic) horse head shaped dark nebula (Barnard 33) carved out on one side.  The Flame Nebulae, a bright emission nebula, also has a dark nebula at its center. Both nebulae are contained in the star-forming region of the Orion Molecular Cloud Complex and are illuminated by Alnitak, a triple star at the eastern end of Orion's Belt.

The moon was smiling down at about 98% illumination for most of the 4-hour imaging session, so the dual narrowband filter was a necessity. 

Askar 107PHQ Petzval Quadruplet (749mm fL) 
ASI2600MC Pro (OSC camera) 
ZWO AM5 mount with guiding via ASIAir Plus using an ASI178mm mini and a 60mm F4 guide scope
Antlia ALP-T Ha/OIII dual narrowband filter
240s x 48 [Total Exposure 3:12]; with dark, flat, and dark-flat frames 
Pre-processed in Siril and post-processed in Photoshop.