I have been down this same road with my 130 SLT however after researching and trying it out for myself it is not possible to achieve prime focus with this scope.
After buying the T-Adapter and EOS t-ring adapter I placed it in the focuser and was unable to focus the Moon. I did as what was said below and removed the 2" eyepiece adapter and there is still not enough room in order to achieve prime focus. The only solution is to use a Barlow attached to the T-Adapter. Believe me I went down this road and learnt the hard way. Also the 130SLT isn't that good to use with a DSLR as the tripod and mount isn't 100" steady. Every photo I took which causes the shutter to move made the telescope wobble slightly and using a 2x Barlow (magnified) made the image blurry.
I do not recommend the DSLR path for this particular type of telescope. I eventually bought the NexImage 5 (a CMOS camera) and I highly recommend buying a CMOS camera. You will get much more out of it with this telescope.
In order to stabalise the scope more with my astrophotography work I added Tube rings and an electronic focuser (instead of manually focusing the object which causes vibration this device allows you to obtain the best focus without touching anything and have no vibration).
If you need any help or anything please let me know as we both have the same scope
