TS 2.5'' Rack and Pinion Focuser M90
TS 2.5'' Rack and Pinion Focuser M90TS 2.5'' Rack and Pinion Focuser M90TS 2.5'' Rack and Pinion Focuser M90

TS 2.5" Rack and Pinion Focuser M90

  (2 Reviews)
✓ 2 year warranty


2x in stock shipped 1-2 working days

About this product

Model:  ts_tsfocr25
Part Number:  TSFOCR25

The TS 2.5" Rack and Pinion Focuser is a high-quality 2.5" focuser with a max payload capacity of 6kg.

Telescope side connection - M90x1 female thread:

The TS 2.5" rack and pinion focuser is attached to the telescope via an M90x1 female thread adapter. 360° rotation is also included -  with no tilting. The connection fits directly to the 6" and 8" StellaLyra Ritchey Chretien and Cassegrain telescopes.

Camera side/eyepiece side connection:

The TS 2.5" rack and pinion focuser has an M63x1 connection thread on the camera side. This allows direct screwing of corrector systems like the TS 2.5" full-frame flattener for refractors or StellaLyra Ritchey Chretien telescopes.

In addition, a 2" eyepiece adaptor is included (compression ring with three screws), and a 2" to 1.25" adaptor is also included.

This focuser does not use ballbearing supports, which can tilt. Instead, it uses a  Teflon support, guaranteeing a complete lack of play when used with heavy loading. The draw tube's motion is separated, offering the best possible stability and smooth movement.

We recommend the Short Version of this focuser if you use a focal reducer with your RC or CC


  • Telescope Side Connection: M90x1
  • Camera Side Connection: M63x1
  • Eyepiece Adaptors: 2" and 1.25"
  • Focus Travel: 95mm
  • Focuser Drawtube Inner diameter: 62mm with anti-reflection internal thread
  • Focuser Drawtube Outer Diameter 69mm plus 3mm for the rack
  • Dual Speed Reduction: 1:10
  • Maximum Load Capacity: 6kg


What's in the box

  • 2.5" Rack and Pinion Focuser
  • M90 Telescope Side Connection Adapter with 360° rotation
  • 2" eyepiece adapter with compression ring
  • 2" to 1.25" eyepiece adapter with 2" filter thread


Customer reviews

Average Rating (2 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Excellent Upgrade
21 August 2022  | 

I bought this focusser for my Stellalyra RC6 to primarily take OAG-L, EFW and 2600mm pro. Really robust and a huge improvement over the scope’s supplied focusser (which I’m sure if fine with a lighter setup hanging out back of it). As ever excellent delivery and service from FLO.

Rating (max 5):  
Very Good
27 January 2022  | 

I think I may jinx focusers.

My two favourite telescopes are a Meade 6000 80mm and a William Optics FLT132. Both are superb telescopes but the focusers died after only a year or two. I replaced them with a big Moonlite which is fine for the 132 but really too big for the 80. The Meade is a sufficiently rare telescope that few focuser specs mention that they are compatible. This one is and has restored the Meade's balance.

I can't say it is silky smooth but it gives the appearance of being well constructed and vastly better than the focuser supplied with most telescopes. I have no doubt that a Starlight if you could both find one and afford it would be better but this appears to be a fine product.


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