I have had pretty good luck with my SA-100 using my Evolution 8 SCT. However, it is out for repairs so I tried using my 102 mm f6.5 refractor and I got some strange looking spectra. I am not sure if it is due to the refractor or not. As you can see, the spectrum is pinched around the green/yellow wavelengths. And this pinching was even apparent when just looking thru a higher power eyepiece. I don't remember seeing that with my other scope.
Any idea what is going on?
EDIT: This was Vega (almost straight up overhead) with an ASI 178 MM camera. I realize my focus is not good but I didn't get far enough to fine tune it as I was trying to figure out where the pinch effect was coming from.
Edited by descott12, 25 July 2019 - 06:14 AM.