QHYCCD OAG Off-Axis Guider – Large – OAG-L QHY

QHY Large Off-Axis Guider

The QHY OAG comes in three versions to accommodate image sensors of various sizes. All QHY Off-Axis Guiders have the same main body, which includes the prism, but the telescope/camera interface is sized to accept thread adapters of different diameters. Regardless of the diameter of the interface, it has six (6) 3mm holes and, without adapters installed, a thickness of 10mm. Both the telescope side and camera side adapters have a thickness of 3mm. The final thickness of the OAG depends on whether you need to use just the telescope side thread adapter or both adapters. If you are using the QHYCFW2-L, for instance, it will connect directly to the OAG-L, and you won’t need to use the camera side adapter.

The “Large” version of the QHY OAG has a diameter of 68mm and will accept M42x0.75, M54x0.75 and M60x0.75 adapters. It will work with cameras that have larger sensors, such as the QHY(IC)16803, which has a 37×37 sensor. Other suitable CCD sizes include 36.24 or 48×36, although the 50100, which has a 48×36 sensor, would require a special adapter, which is not included in this package.

The QHY OAG has an 8mm x 8mm multi-coated prism. Its position can be adjusted as desired and then locked into position with a thumbscrew. This OAG also comes with a locking multi-thread 1.25″ focuser with an approximate range of 6mm. If you use the QHY5L-II as your guide camera, its position is adjustable when inserted into the QHY OAG-L. These two adjustments will give you a wide range of back focus.

Please Note: Choose the Medium version of the OAG if you want to use a camera with an APS-C, APS-H or 36×24 sensor, such as the QHY(IC)16200A, or you have the QHYCFW2-M filter wheel.

Choose the Small version if you have the QHYCFW2-S filter wheel or a sensor that is smaller than APS-C. You can read more about the QHY OAG-M here and the QHY OAG-S here.