during testing I found in all of my images some strange rings appearing. Look here:
CCD-Image-243b.jpg 132.65KB 2 downloads
The imaging train is as follows (from front to camera):
- Tube opening (tube is covered with a black cloth)
- Secondary mirror f/3
- Primary mirror, f/3
- Microtouch focuser, 4"
- ASA Cassegrain Reducer-corrector (x0,72), 4"
- Distance adaptor
- FLI Filterwheel
- FLI PL 16803
I don't really know, maybe it's something with the baffles, or the reducer lens. If any of you have an idea, I'm open for everything