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-L-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-L-Pro has an optical thickness of 12mm, and to this is added a 5mm adapter for a 54mm or 62mm threaded flattener or coma corrector on the telescope side. Various adapters connect the QHYOAG-L-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 68mm.

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.

Connecting:

Model	QHYOAG-L-Pro
Telescope Interface	M54x0.75; M62x0.75 (adapters provided)
Thickness/BFL Consumes	12mm
Prism size	14x10mm
Diameter of 6 x M3 screw hole positions	68mm
Suitable for CCD/CMOS Size	Full Frame and larger
Compatible Filter Wheel	QHYCFW3-M/L/XL (adapters provided)
Guide Camera Interface	1.25-inch
Weight	165g

Before using, please remove the protective film attached to the prism.

The OAG body has six holes with a diameter of 3mm, used for connecting with various adapter rings or the QHYCFW3 filter wheel.

The OAG includes a prism position adjustment locking knob located on the side of the body. When this knob is loosened, the position of the prism can be adjusted. Adjust the prism’s position carefully to ensure it doesn’t obstruct the chip. If you find any obstruction in the corresponding position of the captured image, move the prism further away from the chip.

The OAG features a helical focusing seat, allowing for fine adjustments to the camera’s focal plane. On the focusing seat, there’s a focal plane position locking knob. When adjusting the focus, please release this knob. Once the focal length is adjusted, lock this knob. Do not forcibly rotate the focusing ring when it’s locked, to prevent damage to the internal structure. Once locked, you’ll notice that the focusing ring can still move slightly left or right. This is normal, and at this point, the camera is locked, and the focus won’t change.

The OAG can be used in conjunction with a guiding camera. It’s important to ensure that the distance from the prism’s surface to the guiding camera is equal to the distance between the prism’s surface and the imaging CCD. If the guiding camera is still not in focus at its limit distance, you can remove the front end of the guiding camera to further shorten the distance.

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QHYOAG-L-Pro Off Axis Guider – Large

SKU: QHY-110171

$525.00

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