I recently purchased a dedicated imager for astrophotography from FLI. One of the accessories I needed was something to mate the camera to my Takahashi Epsilon 180. The design of that scope requires very precise spacing of the camera from the mounting flange. Tak makes a number of wide mount T-rings and I had been using the Canon EF version with my other cameras. Unfortunately FLI only makes a Nikor adapter. So, I bought that adapter and the Tak F-mount T-ring. I was a little dismayed to find out that the FLI Nikor adapter does not lock onto the F-mount. In fact, it is not even tight. Worries of the camera falling off the scope and the loose fit causing enough flex to make uniform focus across the entire detector impossible have caused me to look for other solutions. I was thinking about having a part made and found Precise Parts, a small custom machining company that specializes in astronomy equipment. This is not the first request for an adapter like this they have received and they are making one for me based on their own design. That relieves me from the hassle of getting all of the dimensions correct and communicating them. It should arrive in 2 weeks. I’ll let you know what I learn about that and them.