a ultra lightweight guide scope for QHY5-II Series
When the pixel of guide camera becomes small and QE becomes high, you may no need big guide scope. The small pixel can detect the guide error in a short focal length. When the focal lenth reduced, the FOV become bigger. You can find the bright guide star very easy.
QHYCCD's new miniGuideScope is just based this idea. QHY5L-II has 74% high QE, 4 electron readout noise and 3.75um small pixels. This camera is idea for the short focal guide scope. miniGuideScope is a f=130mm Diameter=30mm ultra small telescope with F4.3 ratio. It has no complex focal adjust system. Just rotate the front part focuser it can get fine focal adjustment. There is a locker to fix the focuser position.When it get focus you can lock it and no need focus again in future.