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Guiding, Centering & Adaptive Optics

5 Items

ZWO M68 Off-Axis Guider - 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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ZWO 60mm Guide Scope - ZWO-60280

SKU: ZWO-60280
  • Optical Aperture: 60 mm
ZWO OAG with updated set screws

ZWO OAG Off-Axis Guider - 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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ZWO Atmospheric Dispersion Corrector - ADC

  • 1.25" eyepiece adapter with brass compression ring on the top side
  • 1.25" barrel adapter on the bottom side
  • Contains female T-threads on both sides
  • A white locking screw makes the null point easily detectable for setting the levers symmetrically and fine positioning without rotating the ADC body
ZWO M42 Camera Adapter for ZWO Off-Axis Guider

ZWO M42 Adapter (OAG) - OAG-M42C

  • ZWO Off-Axis Guider OAG adapter with M42 threads.
  • Connects the ZWO OAG to M42 threaded imaging cameras.

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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