Thanks for the info. I have been looking at that specific lens. Outstanding results with it.
I also looked at the az gti but for some reason was slightly worried about polar alignment with it for tracking. I realise it's a matter of proper research regarding that mount and the go to function seems really useful.
I already have a 9x50 finder I bought for guiding years ago with am old spc 900 webcam that I didn't have much if any luck with but from what I can see things seem way more simple and affordable now.
I also love the idea of those asiair but again wasn't sure if the Sony was compatible or not... I need to learn more about plate solving and tracking/guiding to work out exactly what I'll need to get but it sounds like maybe a guide camera , asiair mini and the azgti then the samyang/rokinon 135mm f2 could be somewhat close to a good portable kit I can have some fun with.
Thanks for the recommendations