QHY OAG-L, Large Off-Axis Guider
The "Large" version of the QHY OAG has a diameter of 68mm. It will work with cameras that have larger sensors, such as the QHY(IC)16803, which has a 37x37 sensor. Other suitable CCD sizes include 36.24 or 48x36, although the 50100, which has a 48x36 sensor, would require a special adapter, which is not included in this package.
The QHY OAG has an 8mm x 8mm multi-coated prism. Its position can be adjusted as desired and then locked into position with a thumbscrew. This OAG also comes with a locking multi-thread 1.25" focuser with an approximate range of 6mm. If you use the QHY5L-II as your guide camera, its position is adjustable when inserted into the QHY OAG-L. These two adjustments will give you a wide range of back focus.