Astrodymium 2.5'' Riser Blocks for Refractor Telescopes (Metric & Imperial Hardware)
 Astrodymium 2.5'' Riser Blocks for Refractor Telescopes (Metric & Imperial Hardware)Astrodymium 2.5'' Riser Blocks for Refractor Telescopes (Metric & Imperial Hardware) 

Astrodymium 2.5" Riser Blocks for Refractor Telescopes (Metric & Imperial Hardware)

  (2 Reviews)
✓ 2 year warranty


Out of stock due 30-40 working days

About this product

Model:  astdym_2.5_riser_b
Part Number:  2.5-RISER-BOTH

Astrodymium 2.5" Riser Blocks for Refractor Telescopes (Metric & Imperial Hardware)

These risers lift your entire telescope 2.5" (64.80mm) above the dovetail bar, which as a result allows for the full rotation of the focuser, and the ability to balance the scope properly. 

Risers also prevent off-axis guiders & filter wheels from pressing against the ground when the scope is not being used. 


  • Intended for use on refractors with an aperture of ~85mm or smaller
  • Rated for use down to -25ºC (-13ºF) and up to 80ºC (176ºF) temperatures
  • Made from 3D printed PETG material

Compatibility is based on the type of thread your tube rings use. The majority of refractor rings use an M6 thread, but some brands such as Stellarvue and Sky-Watcher use a 1/4-20" imperial thread.

What's in the box

  • 2x 2.5" (64.80mm) tall riser blocks made out of PETG material
  • 2x 1/4-20x3" bolts

Customer reviews

Average Rating (2 Reviews):  
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Astrodymium 2.5 Riser Blocks
Wednesday, 13 July 2022  | 

Great blocks, fits perfectly on my Lacerta 72mm apo. Good price and fast shipping.
Thumbs UP!

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Have they ever been tested?
Thursday, 21 April 2022  | 

The riser blocks themself look ok, however the bolts that are supplied with the risers are useless. Given that the riser blocks are 64mm, the bolts are 80mm (threaded part is 74mm with the head approx 6mm). when the bolts are inserted into the risers only 10mm of thread is remaining. Once used in conjunction with a dovetail etc, the bolt does not actually exit the riser at all. For them to be any use at all they would require at least 100mm but more probably 110mm. This is disappointing and suggests that they have never actually been tested on any sort of scope. I cant see any other way of using these unless additional fittings are purchased.


These should be used with a dovetail that has a recessed hole or slot, the bolt part should then sit within the slot so priovide enough thread to comfortably go into a set of rings.

If your dovetail doesn't have a recess, then you will need longer bolts.


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