I have a Sony rx1r II full frame compact camera, which produces lovely photos, particularly in low light. It has a very nice Zeiss 35mm lens and 42mp sensor. I'd like to use it for afocal astro and terrestrial photography, but I've read here that because the afocal method places a lot of glass between the sensor and object, the image quality is not great. I'm wondering to what extent using very good glass would overcome that problem or whether it would be smarter to buy a Sony A7 dslr instead and use the prime focus method. The two options I'm thinking of are as follows:
Option 1: Rx1r II camera + 49mm to 48mm step down ring to connect to T mount, which connects to Adaptaview adapter which connects to 2" 21mm televue ethos eyepiece + Explore Scientific CF 80mm telescope. The 21mm eyepiece has a field stop of 36.2mm, so my hope would be that this would minimize vignetting. Cost - around $1900 (I already own the camera).
Option 2: A7 camera (not quite the quality of the Rx1r II) + T mount + CF 80 telescope. Cost - around $2100.
Which of these do you think would produce better images? How much vignetting could I expect with option 1? Other thoughts? Thanks much.
Option 1: Rx1r II camera + 49mm to 48mm step down ring to connect to T mount, which connects to Adaptaview adapter which connects to 2" 21mm televue ethos eyepiece + Explore Scientific CF 80mm telescope. The 21mm eyepiece has a field stop of 36.2mm, so my hope would be that this would minimize vignetting. Cost - around $1900 (I already own the camera).
Option 2: A7 camera (not quite the quality of the Rx1r II) + T mount + CF 80 telescope. Cost - around $2100.
Which of these do you think would produce better images? How much vignetting could I expect with option 1? Other thoughts? Thanks much.