I used this on my Pentax ME with the T ring for Pentax. The back of this lens is the C thread type. It needs a camera that takes this or a it need a T-Ring adapter for your camera.
I have used it for most astroimaging , pigybacked on my
larger scopes while shooting CCD images. It is also a pretty decent
telephoto lens as well.
I haven't used it in about a year. I got it for $140.00
I am asking $90.00 OBO ,including shipping in CONUS