I couldn’t imagine a better final object for the winter season. Rosette Nebula is my favorite H II region in the constellation Monoceros. At the same time, I used this deep-space object to test my portable Newtonian telescope with my new monochromatic camera ZWO ASI 2600MM. Well compared to the previous setup, this camera has much smaller pixels, which increases the requirements for the optics, specifically for the coma corrector. I am not happy with the star shape and for my planned trip to Namibia, I will try to find a portable refractor.

Here is a “fake” Hubble palette (SII, Ha, OIII):

And here more realistic bi-color variant (Ha, OIII, OIII)

TelescopeNewton 150/600 mm
Aperture150 mm
Focal length570 mm
MountRainbow Astro RST 135
AutoguidingZWO 174MM, QHY Mini Guide Scope
CameraZWO 2600MM @-10°C
CorrectorMaxField coma corrector
FiltersAntlia Ha, OIII, SII 3 nm
Exposure94x300s, Gain 100, bin 1×1,
Date2022-01-12