Hoping you can help.
I am pretty much sold after reading many in-depth reviews and recommendations of the various Baader diagonals to get one of the BBHS coated diagonals, however, due to their steep price and my current entry level equipment which i'll be looking to upgrade in the future (but probably not for a few years), I'm a little stuck on which to pull the trigger on - the T2 zeiss prism (the 36mm one, not the smaller one), the 2" mirror or the 2" zeiss prism.
I currently have (don't laugh) a Celestron Astro Fi 6" SCT and 1.25" eyepieces only due to the narrow baffle tube diameter. Down the line I'll look to upgrade this to either the C9.25 or Edge 8 as an absolute aperture minimum but hopefully bigger - sticking with an SCT I am reasonably sure of i.e. likely f/10 minimum too. This is making me think I should get one of the 2" options to give me the best flexibility in the future if I do use 2" eyepieces with no vignetting. I am aware using 2" eyepieces is useless now due to my current baffle tube restrictions but I do have the clicklock 2" SCT visual back and a 1.25" clicklock adapter for a more secure connection of accessories.
I'm also keen to use a binoviewer ideally before I upgrade my OTA (and mount) with a set of Hyperion Zooms which is making me lean towards the T2 prism with its great flexibility of adapters and the need for a shorter optical path with binos. The ideal back focus on my SCT is 127mm. It is worth noting, and I have checked with Baader, that I cannot connect a 2" diagonal directly to the SCT thread on a 6" using their locking ring as the locking ring diameter is too large and will not fit due to the distance to the focus wheel.
I basically want to buy one best-in-class diagonal which will cover all use cases with any size SCT which is probably not possible and I should just suck it up and accept i realistically need a T2 set up should I choose to use binos at any point and a 2" when I upgrade, but if anyone has any advice on what I should do, please let me know!