Female thread on one end and male on the other. I'm not sure how it goes, whether the female end threads onto an adapter that goes into the focuser and the male onto the camera with a different adapter or the other way around. I've borrowed this from Gary Beal to do comparison testing on the ED80, but Gary would use it on his Zeiss refractor. I was hoping to get something cheap and standard to do the job of attaching it. I guess not.
But that is ok, these are issues that can be highlighted during the write up.
eg. "Couldn't use the AP focal reducer flattener. It needs finicky specialized elitist threads to attach to common as muck ED80"
