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Guiding, Centering & Adaptive Optics

15 Items

Atik Off-Axis Guider - ATK0070

SKU: ATK-ATK0070
  • With this Atik Off-Axis Guider and its precise fine-focus system, you can create your own optimal guiding system.
  • Three different extension ring lengths allow this OAG to reach focus using a wide variety of imaging cameras.
  • Moving prism helps with selecting the star best suited for your guiding needs.
  • Weighing in at 6.35 ounces, the Atik Off-Axis Guider has a 54 mm clear aperture.
  • Compatible with sensors sizes up to full frame 35 mm
$227.00

Baader Off-Axis Guider for RCC Newton Coma Corrector - GUIDER

SKU: BAD-GUIDER
  • This Baader Planetarium Off-Axis Guider is specifically designed for use with the RCC-I Coma Corrector.
  • With a body measuring 36.5 mm in length, backfocus is set at the theoretical required distance of 91.5 mm for the RCC-I.
  • This OAG combined with a Baader t-ring and crossaim eyepiece or guider enables "Off-Axis" guiding with DSLR cameras without having to use extra rings or extensions.
  • Axial and radial guidestar are conveniently adjustable without having to loosen the main camera connection.
  • Suitable for use with 1.25" autoguiders and guiding eyepieces.
$189.00
Celestron Off-Axis Guider

Celestron Off Axis Guider - 93648

SKU: CEL-93648
  • For astrophotography applications, an Off-Axis Guider such as this particular unit from Celestron is an essential accessory because it makes heavy guide scopes unnecessary.
  • Allows the same scope to be used for both imaging and guiding.
  • Eliminates flexure, mirror flop, and other tracking issues.
  • Features an independent 360º camera and telescope rotation controls.
  • Compatible with any T-thread or 48 mm filter wheel.
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$259.95 $249.00
Baader Planetarium Off-Axis Guider for Flip Mirror II

Baader Planetarium Flip Mirror II Off-Axis Guider - BFM-OAG

SKU: BAD-BFM-OAG
  • This Baader Planetarium Off-Axis Guider has been designed for the purpose of directly connecting to the Flip Mirror II Star Diagonal.
  • Allows an autoguider camera that is compatible with every mirror position to be attached to the Flip Mirror II.
  • Requires 24 mm back focus.
  • This is the only prism capable of being tuned so that a particular star is actively centered on the guiding chip.
$114.00

ZWO M68 Off-Axis Guider - M68-OAG

SKU: ZWO-M68-OAG
  • This ZWO Off-Axis Guider is lightweight with its 17.5mm thickness.
  • The M68 Off-Axis Guider is compatible with the ASI6200MM Pro Camera and ASI mini camera only.
  • The prism helps with selecting the star best suited for your guiding needs.
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$199.00

Orion Deluxe Off-Axis Guider for Astrophotography - 05521

SKU: ORI-05521
  • In order to simultaneously image and guide using the same telescope without an independent guide scope, you need this Orion Deluxe Off-Axis Guider.
  • By not having to use a separate guide scope, tracking issues such as differential flexure and mirror shift are eliminated while overall weight and setup time are reduced.
  • Suitable for use with autoguiders that have T-threads or a 1.25” nosepiece, along with 1.25” illuminated reticle eyepieces.
  • Includes a 2” nosepiece for attaching to any 2” telescope focuser, or any rear cell equipped with T-threads.
  • Three T-extensions of varying lengths (7 mm, 17 mm, and 30 mm) are also included to comply with different combinations of cameras and guiders.
  • Easily locate a guide star with prism tilt adjustment and over 100 degrees of radial adjustment.
$99.99

Orion Thin Off-Axis Guider For Astrophotography - 05531

SKU: ORI-05531
  • This Orion OAG is a elegantly thin Off-Axis Guider optimally suited for use with Newtonian reflector telescopes and DSLR cameras.
  • Permits simultaneous imaging and guiding via a single telescope without requiring a separate guide scope.
  • With only 10.5 mm of thickness, this Orion Off-Axis Guider is a perfect match for telescopes with restricted back focus travel like Newtonian reflectors.
  • This OAG's thin profile keeps it from meddling with the use of coma correctors.
  • Fixes any existing flexures preventing accurate guiding and tracking.
$129.99
Starlight Xpress Slimline OAG

Starlight Xpress Slimline OAG for USB Filter Wheel with Lodestar - SLFW-OAG

SKU: SLX-SX-SLFW-OAG
  • This Starlight Xpress Ultra Slimline OAG attaches directly to the SX USB Filter Wheel for enhanced guiding accuracy with no flexure.
  • Contributes only 13 mm to the focus wheel's back focus distance.
  • The Ultra Slimline OAG is expressly designed for use with the Starlight Xpress USB Filter Wheel and either the Lodestar, SXV, or SXV-EX autoguider.
  • Adjustable pick-off prism axis helps to maximize guide image quality.
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$230.00
Slimline OAG with Extension Tube

Starlight Xpress Slimline OAG & Extension Tube - SX-UOAG

SKU: SLX-SX-UOAG
  • This Starlight Xpress Ultra Slimline Off-Axis Guider attaches directly to the SX USB Filter Wheel for enhanced guiding accuracy with no flexure.
  • Contributes only 13 mm to the focus wheel's back focus distance.
  • The Ultra Slimline OAG is expressly designed for use with the Starlight Xpress USB Filter Wheel and either the Lodestar, SXV, or SXV-EX autoguider.
  • Adjustable pick-off prism axis helps to maximize guide image quality.
  • Comes with a 30 mm extension tube for modifying the back focus distance when using other cameras.
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$250.00

Starlight Xpress Slimline OAG for Trius Cameras without a Filter Wheel - SXVR-OAG

SKU: SLX-SXVR-OAG
  • Starlight Xpress Slimline Off-Axis Guider for Trius imaging cameras with no filter wheel.
  • Attaches directly to the Starlight Xpress USB Filter Wheel for enhanced guiding accuracy without flexure.
  • Includes a 20 mm extension tube and both male and female T-thread adapters.
  • The Ultra Slimline OAG is expressly designed for use with the Starlight Xpress USB Filter Wheel and either the Lodestar, SXV, or SXV-EX autoguider.
  • Adjustable pick-off prism axis helps to maximize guide image quality.
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$350.00 $280.00

Atik One OAG Off-Axis Guider - ATK0132

SKU: ATK-ATK0132
  • Even though the Atik One Off-Axis Guider is slightly smaller, it still retains all of the features of the original Atik OAG.
  • This easy-to-use Off-Axis Guider is optimally suited for use in conjunction with the separately available Atik GP Guide Camera.
  • Adjustable pickup prism compensates for telescope type variation.
  • The Atik One OAG features a fast, exceptionally smooth, and easily adjustable focusing mechanism.
  • Offers 5 mm of travel distance to allow optional guide cameras to be focused without difficulty.
$186.00
ZWO OAG with updated set screws

ZWO OAG Off-Axis Guider - OAG

SKU: ZWO-OAG
  • This ZWO OAG Off-Axis Guider includes several adapters for connecting your guide camera to your imaging camera.
  • Allows simultaneous guiding and imaging without a guide scope.
  • Made of durable black anodized machined aluminum, the ZWO OAG is compatible with all ZWO ASI cameras.
  • Measuring 16.5 mm in thickness, this lightweight OAG features a large 8 mm x 8 mm prism.
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$128.00
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.

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$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.
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$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.
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$280.00

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.

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