This is a special mechanical adapter to mount an Alpy spectroscope on an ST7, ST8, ST10, or ST2000 camera.
The mechanical back focus of SBIG cameras (ST7, ST8, ST10, ST2000) is too important for being used with the Alpy 600. This adapter allows the mount of these cameras on the Alpy 600. You will have to remove the front plate of your camera and replace it with this adapter.
Attention: the lens of Alpy arrives very near the window of the camera CCD, thus it is necessary to use this adapter with caution when doing the spectrum focus to prevent both optics from contacting.