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Mars in 2005

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2.5" Risers for Large Refractors - Free shipping1

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These risers lift your entire telescope 2.5" (64.80mm) above the dovetail bar, allowing for the full rotation of the focuser, which also prevents OAGs/filter wheels from pressing against the ground when the scope is not being used.

Due to the bigger OTA rings found on most refractors 90mm or larger, these risers have a wider base to support the telescope better. If you have a scope that uses smaller rings, then the regular sized risers are a better fit and cost less (see my profile or message me about this).

Installation is done by putting the included screws through the bottom of the dovetail and threading it into the tube rings.

See the technical drawing in the last image for additional details.


Compatibility is based on the type of thread your tube rings use. The majority of refractor rings use an M6 thread, but some such as Stellarvue and Sky-Watcher use a 1/4-20" imperial thread.
  • If you are unsure which thread your scope uses then you can purchase both screws for an additional $3.00 USD.

  • Two 2.5" (64.80mm) risers made out of PETG material
  • Two M6x75mm screws OR two 1/4-20" x 3" screws (Please specify which or both)

Interac E-transfer (Canadians) and PayPal are accepted.

Price includes shipping to the United States only. Contact me for a shipping quote anywhere else (include your zip/postal code).