I currently image with an AT 8RC and a ZWO ASI071. At native FL of 1625mm my image scale is .61 arc seconds/px. With a 0.67 reducer the FL becomes 1088mm and the image scale is .91.
I find both of these focal lengths to be very pleasing and give me the framing that I like the best. I also have an AT65EDQ for wide field imaging.
The 8RC has its challenges (collimation and field curvature) and I am considering a Skywatcher Esprit 150 ED. Up to now my hesitation has been that I would lose the image scale/framing that the longer native FL of the 8RC gives me.
I started looking at different cameras and came across the ZWO ASI183. Using that camera with the Esprit 150 would give me an image scale of .47 with a pixel size of 2.4mu and framing very close to the framing of the 8RC/ASI071combo.
Using the ASI071 with the SW150 would give me an image scale of .94 with a framing very close to the 8RC/071/0.67 reducer combo.
Below is a screenshot of the FOV that I could expect from these various camera/scope combinations.
I realize that the ASI183 has much smaller pixels than the ASI071 and that the Esprit150 has 2” less of aperture than the 8RC, both of which mean longer exposures. But my CEM60 regularly gets less than 0.5 RMS on exposures longer than 6 minutes so I am not as concerned as I might otherwise be.
I would end up with the ASI071 and the ASI183 and the SW150. I would use the 183/150 combo to replace the 8RC at native FL and the 071/150 combo to replace the 8RC with reducer.
Am I missing something here or would I end up with a good replacement?
Edited by santafe retiree, 22 May 2019 - 10:23 AM.