Skip to content

Guiding, Centering & Adaptive Optics

5 Items
QHY Mini GuideScope for QHY5 Cameras - Mounting Bracket Not Included

QHY Mini Guide Scope Only for QHY5 Series Cameras - MINIGUIDESCOPE

SKU: QHY-MINIGUIDESCOPE
  • Optical Aperture: 30 mm
$109.00
QHY OAG Off-Axis Guider - Small

QHY OAG Off-Axis Guider - Small - OAG-S

SKU: QHY-OAG-S
  • Measuring 54 mm in diameter, this QHY Off-Axis Guider is the small version that supports camera models that use sensors smaller than the APS-C, including the QHY21/22/23, QHY9, and QHY8/10/12.
  • This small QHY OAG accepts M42 threaded adapters only.
  • All QHY OAGs are 10 mm thick without adapters installed, with each containing six 3 mm holes.
  • Despite their differences in telescope/camera interface diameters, all QHY Off-Axis Guiders have identical main bodies, including the prism.
  • For a wide back focus range, the QHY OAG offers an adjustable multi-coated prism as well as an adjustable locking multi-thread 1.25" focuser for those using the QHY5L-II as their guide camera.
  • Connects directly to the QHY90A and QHY695A cameras as well as the QHYCFW2-S filter wheel, no camera side adapter required.

Free shipping Free shipping
$180.00
QHY OAG Off-Axis Guider - Medium

QHY OAG Off-Axis Guider - Medium - OAG-M

SKU: QHY-OAG-M
  • Measuring 62 mm in diameter, this QHY Off-Axis Guider is the medium version that works best with cameras that have APS-C, APS-H, and 36x24 sensor sizes.
  • This medium QHY OAG accepts both M42 and M54 threaded adapters on the telescope side as well as the camera side.
  • All QHY OAGs are 10 mm thick without adapters installed, with each containing six 3 mm holes.
  • Despite their differences in telescope/camera interface diameters, all QHY Off-Axis Guiders have identical main bodies, including the prism.
  • For a wide back focus range, the QHY OAG offers an adjustable multi-coated prism as well as an adjustable locking multi-thread 1.25" focuser for those using the QHY5L-II as their guide camera.
  • Connects directly to the QHY16200A camera and QHYCFW2-M filter wheel, no camera adapter required.
Free shipping Free shipping
$230.00
Large Version of QHY OAG (OAG-S in front)

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

SKU: QHY-OAG-L
  • Measuring 68 mm in diameter, this QHY Off-Axis Guider is the large version that works best with large sensor cameras that such as the QHY(IC)16803.
  • All QHY OAGs are 10 mm thick without adapters installed, with each containing six 3 mm holes.
  • Despite their differences in telescope/camera interface diameters, all QHY Off-Axis Guiders have identical main bodies, including the prism.
  • For a wide back focus range, the QHY OAG offers an adjustable multi-coated prism as well as an adjustable locking multi-thread 1.25" focuser for those using the QHY5L-II as their guide camera.
  • Connects directly to the QHYCFW2-L large color filter wheel, no camera side adapter required.
Free shipping Free shipping
$280.00
QHY Mini GuideScope for QHY5-II Series Cameras
$129.00

Guiding can be a daunting task for the new astrophotographer, but it doesn’t have to be. An equatorial mount is a must-have for anyone interested in imaging celestial objects. An equatorial mount compensates for the Earth’s rotation to help your setup stay fixed on a guide star. However, there are many more accessories that can help you guide easily and hassle-free. The three basic tools that astrophotographers use are an off-axis guider, auto-guider, and a guidescope.


An off-axis guider (OAG) connects to your main optical train and typically uses a prism to redirect a small pathway of light to a separate guiding camera. This way, you can do short exposures, detect stars, and calculate guiding errors. This setup is a lightweight option and, in most cases, will not add flexure to your imaging setup. Also, an OAG is typically a cost-effective option: all you need is an OAG and a guiding camera. However, an OAG will add extra length to your imaging train, so it may be cumbersome to obtain focus. We recommend OAGs for new amateur astrophotographers because it is a straightforward and inexpensive guiding system.


If you are looking for a more advanced guiding system, then a guidescope is the way to go. These scopes are typically small refractors that you mount on top of your main imaging system. This is a great option for astrophotographers who prefer to image through a smaller aperture and slower telescope because this is when stars are more difficult to see through an OAG. However, piggybacking a guidescope adds significant weight to your setup and can cause flexure or extra strain on the mount.


An autoguider is an excellent choice for astrophotographers looking to take long exposures. This high-tech camera sits on the back of your guidescope or OAG. The autoguider is then connected to your mount to keep your setup continuously tracking the guide star throughout your imaging session. This dramatically reduces tracking errors and eliminates drift, which can cause oblong stars to appear in your image. Autoguiding is perfect for deep-space imaging, where it is crucial to be precise when guiding.

High Point Scientific is rated 4.9/5 based on 1347 reviews