I am about to pick up my first AP full setup (Orion 8" f/3.9 Newtonian, Atlas EQ-G, Skywatcher Quattro F4 Coma Corrector, Orion StarShoot AutoGuider Camera and 80mm guide scope) and I am a little confused on what to grab next. I know I need a T-Ring for the A7iii I want to use in this setup, but I'm not sure which one to get. I see a few options online like this or this, but I am not sure if either are 2" T-rings. I found this one that I'm sure is 2", but it is crazy expensive for a little piece of plastic. Am I missing something? Also, what is the major difference between a 2" and 1.25" T ring? Will it effect my photos much? Is there anything else i need in my optical train before I start shooting? A 1.25" T ring would really help with using a barlow (2" ones are harder to find) and possible eyepiece projection, but I also don't want to use it if it has major drawbacks, especially for a full frame. Lastly, if i were to do eyepiece projection, would something like this work, and what are the downsides of eyepiece projection? Any help would be appreciated!