GSO Focuser Collimation Ring / Tilt Adapter - For 6" and 8" CC / RC Telescopes with M90x1 Focuser Thread
Stock count is accurate & shown in real time.
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
Contiguous US / Lower 48:
Free shipping applies to orders over $50 using our chosen carrier/method. Faster paid options are available at checkout.
Alaska, Hawaii & US Territories:
Free shipping applies to many—but not all—products. Enter your ZIP code in cart or upon checkout to confirm options and costs.
International:
International orders do not qualify for free shipping. Shipping, duties, brokerage, tariffs, and taxes are the customer’s responsibility. Some items may be restricted due to export, size, or manufacturer limitations.
- GSO FF670 collimating ring for adjusting the tilt angle of the telescope focuser
- Compatible with the following GSO telescopes: CC4.5, RC6, CC6, RC8 and CC8
- Helps ensure sharp images across the field of view, especially for cameras with larger sensors
- Spring-loaded for easy adjustment during imaging sessions
- Easily inserted between the rear cell and the focuser while taking only 15mm of back focus
The GSO FF670 collimating ring helps improve image sharpness when using your 6” or 8” GSO Ritchey-Chretien or Classical Cassegrain telescopes. The ring allows you to slightly adjust the tilt of the telescope’s focuser so it’s square with the axis of the telescope’s optics. Such adjustments are sometimes required to counteract the small and unwanted tilt of the focuser induced by machining tolerances in the threads of the telescope’s focuser and rear cell. This is especially important when imaging with cameras with larger full-frame sensors.
The FF670 collimation ring fits between the rear cell of your telescope and the focuser/camera assembly. The ring consists of two spring-loaded components with push-pull collimation screws that let you adjust the tilt angle and then lock the position in place.
The telescope side of the ring has M90x1 female threads that connect to the threaded rear cell of the telescope or to appropriately threaded extension rings. The camera side of the collimation ring has M90x1 threads to attach to your focuser. The ring takes only 15mm of back focus.
When installed, the focuser collimation ring will cover the primary mirror collimation screws on the rear cell of your telescope. To ensure enough clearance for these screws should you need to adjust them, you may need to install at least one of the 90mm extension rings supplied with your telescope.
Important note: We have had some cases in the past where this item did not work with M90 extension tubes from those customer's GSO-made (but not GSO branded) scopes. In all cases, it turned out that the issue was with the extension tube threads that were slightly out of spec (even though they did work perfectly on the scope) and not with this tilt adapter. Hence, for any reason, if this item does not thread on properly to your older GSO-made but not GSO-branded telescope, focuser, or spacers, then the issue is almost certainly with machining tolerances on your telescope or its accessories and not with this adapter.
Other Information
- Country of Manufacture: Taiwan
The GSO FF670 collimating ring helps improve image sharpness when using your 6” or 8” GSO Ritchey-Chretien or Classical Cassegrain telescopes. The ring allows you to slightly adjust the tilt of the telescope’s focuser so it’s square with the axis of the telescope’s optics. Such adjustments are sometimes required to counteract the small and unwanted tilt of the focuser induced by machining tolerances in the threads of the telescope’s focuser and rear cell. This is especially important when imaging with cameras with larger full-frame sensors.
The FF670 collimation ring fits between the rear cell of your telescope and the focuser/camera assembly. The ring consists of two spring-loaded components with push-pull collimation screws that let you adjust the tilt angle and then lock the position in place.
The telescope side of the ring has M90x1 female threads that connect to the threaded rear cell of the telescope or to appropriately threaded extension rings. The camera side of the collimation ring has M90x1 threads to attach to your focuser. The ring takes only 15mm of back focus.
When installed, the focuser collimation ring will cover the primary mirror collimation screws on the rear cell of your telescope. To ensure enough clearance for these screws should you need to adjust them, you may need to install at least one of the 90mm extension rings supplied with your telescope.
Important note: We have had some cases in the past where this item did not work with M90 extension tubes from those customer's GSO-made (but not GSO branded) scopes. In all cases, it turned out that the issue was with the extension tube threads that were slightly out of spec (even though they did work perfectly on the scope) and not with this tilt adapter. Hence, for any reason, if this item does not thread on properly to your older GSO-made but not GSO-branded telescope, focuser, or spacers, then the issue is almost certainly with machining tolerances on your telescope or its accessories and not with this adapter.
- GSO FF670 collimating ring for adjusting the tilt angle of the telescope focuser
- Compatible with the following GSO telescopes: CC4.5, RC6, CC6, RC8 and CC8
- Helps ensure sharp images across the field of view, especially for cameras with larger sensors
- Spring-loaded for easy adjustment during imaging sessions
- Easily inserted between the rear cell and the focuser while taking only 15mm of back focus
The GSO FF670 collimating ring helps improve image sharpness when using your 6” or 8” GSO Ritchey-Chretien or Classical Cassegrain telescopes. The ring allows you to slightly adjust the tilt of the telescope’s focuser so it’s square with the axis of the telescope’s optics. Such adjustments are sometimes required to counteract the small and unwanted tilt of the focuser induced by machining tolerances in the threads of the telescope’s focuser and rear cell. This is especially important when imaging with cameras with larger full-frame sensors.
The FF670 collimation ring fits between the rear cell of your telescope and the focuser/camera assembly. The ring consists of two spring-loaded components with push-pull collimation screws that let you adjust the tilt angle and then lock the position in place.
The telescope side of the ring has M90x1 female threads that connect to the threaded rear cell of the telescope or to appropriately threaded extension rings. The camera side of the collimation ring has M90x1 threads to attach to your focuser. The ring takes only 15mm of back focus.
When installed, the focuser collimation ring will cover the primary mirror collimation screws on the rear cell of your telescope. To ensure enough clearance for these screws should you need to adjust them, you may need to install at least one of the 90mm extension rings supplied with your telescope.
Important note: We have had some cases in the past where this item did not work with M90 extension tubes from those customer's GSO-made (but not GSO branded) scopes. In all cases, it turned out that the issue was with the extension tube threads that were slightly out of spec (even though they did work perfectly on the scope) and not with this tilt adapter. Hence, for any reason, if this item does not thread on properly to your older GSO-made but not GSO-branded telescope, focuser, or spacers, then the issue is almost certainly with machining tolerances on your telescope or its accessories and not with this adapter.
Other Information
- Country of Manufacture: Taiwan
GSO Focuser Collimation Ring / Tilt Adapter - For 6" and 8" CC / RC Telescopes with M90x1 Focuser Thread