Originally posted by cuivenion Thanks for the replies. It's being used for astrophotography, so it has to be mounted to a dovetail bar like this:
Skywatcher Dovetail Mounting Plates | First Light Optics
That then fits to my astronomical mounting/tripod. The cam it's being used with is tiny so I would have to mount the lens to the dovetail bar using a tube ring mount, I just can't find one in the right size.
Understood, but I think you'd have a problem mounting that lens with a collar... I don't see anywhere on the lens barrel - except a very thin section where the aperture markings are - where you could attach it. Almost all of of the lens is taken up by the focus ring. Do you see what I mean?
Out of interest, what's the camera you're using? I assume you're using a Pentax K mount adapter for it, and it may be possible to mount a collar of some sort to that... or alternatively use some sort of riser plate on the base of the camera...