I bought a new ZWO ASI2400MC Pro camera. My initial impressions of the camera are very positive. I think I will love using it. Well, so far I do.
This image of the Great Orion Nebula is my first-light test image using a Televue refractor. The observing site was my backyard in suburban Sydney (Bortle 6).
The aim of the image was to confirm I have the correct back focus distance and explore any idiosyncrasies of the camera before I drive a long way from the city to image faint nebulas at a dark location.
The only peculiar thing I have noticed is the unusual diffraction patterns apparent on the bright stars. Notice the dark lanes fanning outward. The diffraction pattern can be seen in the individual sub-frames. I am using a refractor with no obstructions in the optical path and I am wondering what causes the unusual diffraction patterns.
Has anyone else noticed these diffraction patterns before and do you know what causes them?
Televue NP127is Refractor working at f/7.8, focal Length 990 mm, ASI2400MC Pro Camera, Gain 0, Temperature 0 Deg. Celsius, 36 x 240-second exposures. Total integration time 2 hours 24 minutes.
