Optec 2.21" T-Thread Mounting Plate - SBIG ST-4000
The NextGen 3" CCD Camera Mounting Plates fit onto the male Optec-3100 dovetail (3.1" diameter) on the camera side of the NGC 316 NextGEN 3" telecompressor lens system. The tube length of each mount is cut to match the proper back-focus for a particular camera/filter wheel combination.
This T-mount has a tube length of 2.21", which is the proper mount when attaching the NGC 316 to an SBIG ST-4000 CCD camera.
Optec Product Number: 17482-2.21