The main purpose of an Off Axis Guider (OAG) is to use the same optical path as the main camera. This avoids the problem of differential flexure that can occur when using a separate optical system for guiding. An OAG provides more accurate guiding and sharper images.
QHY OAGs include a precision 1.25-inch helical focuser that accepts QHY5II and QHY5III series cameras, as well as other 1.25″ form cameras. The focusing process is smooth and precise. After focusing, you can lock the focus mechanism with thumbscrews.
The QHYOAG-M-Pro has a large (10x14mm) prism to cater for guide cameras with large sensors, such as the Sony IMX585 or IMX174. These larger sensors are sometimes necessary in slow imaging trains such as Schmidt-Cassegrains where acceptable guide stars can be hard to find.
The QHYOAG-M-Pro has an optical thickness of 12mm, and to this is added a 5mm adapter for a 48mm or 54mm threaded flattener or coma corrector on the telescope side. Various adapters connect the QHYOAG-M-Pro to filter wheels, filter drawers and cameras (see connection diagrams for details).
There are six 3mm through holes in the OAG for direct connection to filter wheels and cameras. The radius for these holes on the QHYOAG-M-Pro is 62mm.
Focusing:
The QHYOAG includes a helical focuser with a thumb screw to lock the position. When focusing please loosen the thumb screw. After achieving correct focus make sure you lock the thumb screw. To avoid damage, please do not move the focus ring when the thumb screw is locked. When it is locked, you will still find the focus ring can be rotate a little. This is normal, however the focus will not change.
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