QHY 30mm f/4.3 MiniGuidescope - 100062 Antlia Dual & Tri-Band Filters 8x Reducer/Flattener converts the TV-85

8x Reducer/Flattener converts the TV-85 scope to 480 mm f/5

This ring is compatible with the TSN-DA20

shown above in top right portion of image (the color version is shown at bottom left)

Real-time Periodic Error Correction (RPEC)

QHY 30mm f/4.3 MiniGuidescope - 100062 Antlia Dual & Tri-Band Filters 8x Reducer/Flattener converts the TV-85When the pixels of a guide camera becomes small and QE becomes high, you may not need a big guide scope; smaller pixels can detect the guide error in a shorter focal length. Furthermore, when the focal length is reduced, the FOV becomes larger, so it is easier to find bright guide stars. The QHYCCD miniGuideScope is based on just this idea. The miniGuideScope is a 30mm f 4. 3 (130mm FL) ultra small telescope. It has no complex focal adjust system.