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QHYCCD QHYOAG-L includes a precision 1.25-inch helical focuser that accepts our QHY5II and QHY5III cameras. The focusing process is comfortable. After focusing, you can lock the focus mechanism with thumbscrews.

QHYOAG has three models. The major difference is its different diameter. The three model are QHYOAG-S, QHYOAG-M, QHYOAG-L. QHYOAG is a thin and solid design. The OAG main body is just 10mm thick. Adding an M42 thread or M54 adapter ring adds only 3mm for a total thickness of 13mm. There are six 3mm through holes in the OAG for direct connection to the QHYCFW and QHY A Series cameras

There is a focuser in the QHYOAG. It is for the focus adjustment of the guider. There is a thumb to lock the position. When focusing please loose this thumb. After focusing get well, lock it. Please do not move the focus ring when in lock status to avoid the damage. When it is locked, you will still find the focus ring can be rotate a little. This is normal and the focus is not changing.
The light patch hole of the QHYOAG is 7mm for the guider camera.

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Unlike external guiding arrangements, when using a QHYCCD QHYOAG-M Pro, the guiding camera and the imaging camera share the field of view of main optical system. If a user’s OTA has a long focal length, and the environment is not ideal, there will often be fewer stars suitable for guiding to be found in the FOV. One way to improve the chance of finding a good guide star is to use a guide camera with a larger sensor. For example, guide cameras like the QHY5III200M or the QHY5III585C have a FOV that is 2-4 times larger than that of smaller cameras typically sold as guiders. This larger FOV naturally allows you to capture more stars, essentially solving the issue of no or few stars available to guide the image.

In order for a large-sensor guide camera to fully perform to its potential in an OAG, a prism large enough to allow illumination of the larger sensor is needed to avoid severe vignetting. The new QHYOAG-M Pro uses a new wider prism to better accommodate larger sensor guide cameras. The prism size of the standard QHYOAG series is about 8 x 8mm, while QHYOAG-M Pro is 10 x 14mm.

When the QHY5III174M is connected to the older version of QHYOAG, there is severe vignetting (Image 1, below). In contrast, connected to the OAG Pro in the same optical system, there’s only a small amount of darkening occurs at the edges, which won’t affect guiding at night (Image 2, below).

Combos and Connections

The QHYOAG Series directly attaches to the camera or filter wheel with six screws, ensuring a solid, parallel and reliable mechanical connection. At the same time, various standard and optional QHY accessories can be used to realize a variety of structural combinations.

Below are some typical connection examples. Now Adapter B1 Kit is included in each package of QHY268M and QHY600M-PH SBFL. Adapter G1 Kit is included in each package of QHY268C and QHY600C-PH SBFL.

QHYOAGM-Pro

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The QHYCCD QHYOAG-M has a 1.25″ helical micro focuser to allow adjustment of the guide camera independently of the imaging camera. The prism is 8mm x 8mm and free aperture is 50mm.

It’s compatible with the QHY16200A, QHY367C, QHY128C and QHY medium filter wheels.

The QHYOAG-S is also available and compatible with the QHY695A, 90A, QHY163, QHY183, QHY290, QHY174 etc.

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The Celestron Off-Axis Guider uses a prism to intercept a small portion of the telescope’s focal plane (outside the field of view of the main imaging camera) to locate a guide star.

Any movement seen by the guide star will be the exact same movement seen by the imaging camera.

Guiding this way will correct for tracking errors, as well as opto-mechanical errors or flexure. The result: better astroimages with pinpoint round stars.

The Off-Axis Guider is an essential astro-imaging accessory for long focal length telescopes that require the most accurate guiding possible.

Off-Axis Guiders have been around for a long time, but typically pose three main challenges:

1. Finding a guide star from the far edges of the telescope’s focal plane can be difficult, considering the small field of view and sometimes less-than-ideal illumination.
2. Getting both imaging camera and autoguider to reach focus with one another is time consuming and sometimes requires experimentation.
3. Additional spacers and adapters are usually required for your particular camera, telescope, and autoguider, which adds to cost and complexity.

Celestron’s Off-Axis Guider addresses these challenges by:

1. Providing a large 12.5mm prism that can be adjusted to move closer to the center of the telescope’s focal plane, depending on the size of the imaging camera. This results in brighter guide stars, with the help of the large prism to fully illuminate the autoguider sensor.
2. Featuring a high-quality, fixed-orientation Helical focuser. This provides extremely smooth and accurate focus of the autoguider without changing (or twisting) the autoguider camera orientation.
3. Including all the needed spacers and adapters are included for most common imaging configurations, including DSLR cameras, Nightscape CCD cameras, and more. The following adapters are included: SCT/EdgeHD, female M48, female M42 (T-thread), male M48, male M42 (T-thread), 3 T-thread spacers

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