When I got my 1990's Celestron C8, it came with a rainbow colored sticker that said Fastar, Celestron. Basically Celestron provided the option to remove the secondary lens and replace it with a Fastar lens for camera use, placing the camera in the front of the telescope. Celestron quit making these lenses, but the idea soon developed into Hyperstar and RASA, both popular options. But what of Fastar? After finding an original Fastar lens, it sat in a drawer for a long time. There were problems. Images using Fastar didn't look great and it was designed for the old ST-237 camera. I tried a DSLR and the the images were distorted. The Canon T21 was not the right chip size.
Next up was the ASI224MC, with the Fastar's F/1.95 and focal length of 398. Here are a few examples from last night. Darks and flats in Sharpcap with live stacking and no filter. No post processing. I wanted to show what Fastar and the ASI224MC produced without retouching. Great Scott! 1.21 Gigawatts!?!
13 exposures at 60 seconds each for the Crab Nebula
28 exposures at 60 seconds each for M42
37 exposures at 15 seconds each for the Sombrero