StellaMira 90mm ED Triplet Refractor Telescope
StellaMira 90mm ED Triplet Refractor TelescopeStellaMira 90mm ED Triplet Refractor TelescopeStellaMira 90mm ED Triplet Refractor Telescope
StellaMira 90mm ED Triplet Refractor TelescopeStellaMira 90mm ED Triplet Refractor TelescopeStellaMira 90mm ED Triplet Refractor Telescope

StellaMira 90mm ED Triplet Refractor Telescope

  (1 Review)
✓ 2 year warranty


36x in stock shipped 1-2 working days

About this product

Model:  stellamira_90mm_ed_triplet

Optical Bench Test

FLO tests all StellaMira refractor telescopes before dispatch. 

You can be confident your telescope will, from the outset, have well figured optics, negligible false colour and spherical aberration, and no astigmatism (the bane of any optical system!).

Star shapes will be round, not triangular, oval or egg-shaped!

NEW! Premium quality 90mm f/6 ED Triplet Refractor

All StellaMira telescopes are QC checked in the UK to ensure they reach their full potential. 

Designed for the discerning astrophotographer or astronomer.

Every 90mm f/6 ED Triplet achieves minimum 0.95 Strehl ratio and includes a test report. 

Fully multicoated triplet optics with an ED lens, equal to FPL-53, for high contrast views with very low chromatic aberration. 

A sturdy 2.5" Rack & Pinion, dual speed focuser with 1:10 fine focusing and integral rotator provides excellent load bearing capacity and precise focus adjustment.  

The beautifully finished Carbon Fibre tube with CNC machined aluminium fittings has excellent strength and thermal properties. 

A matching 0.8x StellaMira Reducer / Field Flattener is also available that enables astrophotography at f/4.8 with an evenly illuminated 43.2mm imaging circle (large enough for full-frame sensors). 

Price includes CNC tube-rings, Vixen-style dovetail mounting bar,  carry handle and aluminium carry case. 




  • 90mm Aperture
  • f/6 focal ratio / 540mm focal length
  • Triplet optics with 1x ED glass element (equal to FPL-53)
  • Fully multi-coated optics for maximum light transmission and high contrast
  • Strong and lightweight Carbon Fibre tube with CNC machined aluminium fittings
  • 2.5" Dual-speed Rack & Pinion focuser
  • 1:10 Fine Focus mechanism
  • 360º Camera Angle Adjuster (CAA)
  • Non-marring brass compression rings (2" clamp and 2" to 1.25" adapter clamp) for strong, secure connection
  • Fitted with a Synta-style finder shoe
  • Supplied with tube rings, carry handle and Vixen-style dovetail
  • Includes a heavy duty Aluminium case with die-cut foam
  • Additional M6 threaded holes on the dovetail, handle and tube rings

Telescope Field of View Simulator


  • Tube length (dew-shield retracted): 45.5cm (17.9")
  • Tube length (dew-shield extended): 49cm (19.3")
  • Tube diameter: 107mm (4.2")
  • Dew-shield external diameter: 123mm (4.8")
  • Focuser adjustment range: 95mm (3.7")
  • Tube weight: 3.3kg (7lb 4oz)
  • Tube weight with rings / dovetail / handle: 4.5kg (9lb 15oz)

What's in the box

  • Telescope OTA
  • Vixen-style Dovetail
  • Tube Rings
  • Handle / Mounting Bracket
  • 2" to 1.25" Adapter
  • Storage Case
  • Test Certificate


Type Refractor
Aperture 90mm
Focal Length 540mm
Focal Ratio f/6
Optical Construction

Air spaced triplet, Includes 1x ED Element (Equivalent to FPL-53)

Lens Coating Fully multi-coated
Tube Material Carbon FIbre & Aluminium
Focuser 2.5" Rack & Pinion Dual Speed
Fine Focuser 1:10
Focuser Thread M63x1 Female with 2" eyepiece holder removed
Accessories Tube Rings, Vixen-Style Dovetail & Handle
Case Aluminium case included with Die-Cut foam


Customer reviews

Average Rating (1 Review):  
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Rating (max 5):  
Worth every penny
Tuesday, 12 October 2021  | 

I received the telesope today and, of course, the weather started to misbehave so this will be more of a first look than a review. It is not only good looking but also pleasing to use, the focuser and rotators have that smooth oily move withouth any hint of play, the dew shield slides with the right amount of friction and stays where you put it, the rings are a tight fit - maybe a bit too tight - and can hold the tube even if the screws are loose. The atention to detail is heartwarming: the rings screws have teflon washers, on the front ring you'll find tyny bumpers that prevents collision with the dew shield, the reducer/flattner brings the mirrorless camera in the right orientation relative to the rotator, there is a spare screw supplyed in a tiny bag just in case...
On inspecting the lens, I was impressed by the coatings - the glass is allmost invisible when you look perpendicular and dark green from aside. I took some pictures with the reducer/flattner with my Fuji xt4 and there was no trace of lateral CA and only a hint of longitudinal CA on some out of center, out of focus and high contrast parts of the image. It might lose some quality on the corners of a full frame sensor but on a crop sensor camera like ASI 2600 it will be a blast.
I'm gonna test its resolving power when the weather will allow but i'm shure it will perform as good as it should. I don't have any previous experience with instruments of similar aperture and price so I can't say where it stand relative to its peers but i can tell you won't see much impovement from a more expensive one.
As for the negative side: is a bit back heavy, with all the photo gear attached you might need to attach a weight to the front of the dovetail or, better, replace it with a longer one. The transport case is doing a good job protecting the instrument but ain't gonna take much punishment; if you travel, buy a decent one.
I will end by thanking all at FLO for the excellent job they are doing providing good products and fast service. Respect!


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