Having just discovered the Field of View Calculator on astronomy.tools, I just realized that the ZWO ASI 385 that a friend is giving me will not have enough FOV for some of the larger DSOs when looking through my Explore Scientific AR 127.
How do I shop for a focal reducer? Are there compatibility issues I need to know about? Are there brands to avoid? To see M31, it looks like I could just squeeze it in with a .33x reducer. Is that a bad idea?
I appreciate any positive advice but please don't offer advice telling me to sell my telescope or give back the camera.