This seems to be the only documentation for RC collimation with this. I got the Hotech ACT hoping to collimate my AT8RC and have run into problem
I started with collimating it just as I would do a SCT which requires removing the secondary. The problem was that in AT8RC, to remove the secondary, you need to remove the top and bottom dovetails.. so the scope cannot be mounted and it has to be kept on a wedge.
After fiddling with it, I got the scope and collimator coalligned. Since I was following the SCT collimation method from hotech's video, it didnt require any primary adjustment (since the co-align itself got the reflected cross hairs to be in aligned properly).
Any adjustment to the focuser (I have the moonlite CSL 2.5) or the primary was causing both the primary mirror reflection cross as well as the relfection of the secondary and the hotech reflection mirror to move.
The main problem turned out to be for secondary adjustment. The three dots could never converge in my case to even attempt the adjustment of the secondary.
I restarted by mounting the scope onto to my spare 8SE mount (but this time I had to leave the secondary on). I also had the co-align done pretty quickly and ran into the same "convergence of the 3 dot issue". Did anyone ever complete collimating an RC8 scope with this? I would appreciate any help on this.