Coronado SolarMax III 90 with RichView Tuning and 15mm Blocking Filter

Features external “True” H-a etalon filter giving higher contrast views.

  • Day and night astronomy
  • <0.7 Angstrom hydrogen-alpha bandpass
  • Blocking filter: 15mm
  • Aperture: 90mm
  • Etalon filter size: 90mm
  • Focal length: 800mm
  • Focal ratio: f/8.9
  • CEMAX eyepieces: 12mm, 18mm, 25mm
  • CEMAX 2x Barlow
  • Hard carry case
  • UK warranty
Coronado SolarMax III 90 BF15
  • Product code: 324011
  • Availability: Out of stock
  • Incoming: to be confirmed
  • Retail Price: £ ---
GBP £ --- (inc VAT)
out of stock
Shipping rates
England & Wales
£ 30.00
Scotland Central & South
£ 30.00
Scotland North
£ 50.00
Northern Ireland
£ 50.00
UK islands (from)
£ 70.00


Caution: This telescope should never be used to observe the Sun without the etalon filter and blocking filter (diagonal) fitted. Otherwise, immediate and irreversible eye damage may result.

The SolarMax III is a 90mm F/8.9 refractor equipped with 90mm external hydrogen – alpha (H-a) filter. This is a single-stacked (<0.7 Angstrom) bandpasses model with a 15mm blocking filter. What makes the SM3 standout?


The SM3 90mm has a new two-speed rack & pinion focuser which creates a more user-friendly interaction with the telescope. The two-speed, 2” focuser has both coarse and fine focus controls allowing the user to get a more precise focus, critical for both solar imaging and visual observing.

External etalon

Additionally, the SM3 90mm includes an external “True” H-a etalon filter giving higher contrast views and sharper features compared with models using smaller internal H-a etalon designs. Experience darker backgrounds, sharper features, and higher contrast with the new SolarMax III series telescope.




▼ read more ▼

RichView tuning

The SM3 90mm also includes Coronado’s patented RichView tuning allowing direct tuning of the primary etalon filter. The patented RichView tuning technology provides additional tuning range and an overall better way of adjusting the filters bandpass. No other commercially available H-a telescope can provide the tuning range and accuracy of the new SolarMax III telescope. Now you can tune for the highest contrast views of your favourite solar features without sacrificing image quality.

Day and night

Whether you are focusing on the solar edge or surface features in the chromosphere, the SolarMax III 90mm is the solar scope for you. Since the etalon filter is now external to the telescope, you can easily remove the etalon filter and rear blocking filter diagonal to use the scope as a normal refractor for night time astronomy. It’s like having two scopes in one!

Bundled accessories

The Coronado 90mm SolarMax III series telescope with enhanced rack & pinion focuser and large external etalon is the perfect way to view the Sun! The SM3 90mm comes with 12mm, 18mm, 25mm CEMAX eyepieces, CEMAX 2x Barlow, Sol Ranger™ Solar Finder, Vixen-style dovetail mounting rail, and an all-new black and gold aluminium hard carry case (Dimensions: 68cm x 22cm x 22cm).

Carries full one year UK warranty by Opticstar Ltd on behalf of Meade Instruments Corp.

Coronado SolarMax III 90 solar telescopes.
▲ read less ▲
▼ show specification ▼
Coronado SolarMax III 90 with RichView Tuning and 15mm Blocking Filter
Attribute Specification
Coronado Product Code (SKU) 324011
Universal Product Code (UPC) 709942998382
Warranty 1 year UK warranty by Opticstar Ltd on behalf of Meade Instruments USA
Series SolarMax III
Experience Level Beginner
Optical Design Achromatic Refractor
Optical Coatings Fully Multi-Coated
Clear Aperture 90mm
Solar Filter <0.7 Angstrom hydrogen-alpha (Ha) bandpass
Etalon Size 90mm, external
Focal Length 800mm
Focal Ratio f/8.9
Optical Elements 1
Blocking Filter 15mm, fitted inside the star diagonal
Viewfinder Sol Ranger™
Focuser Mechanism 2" Rack and Pinion with 7:1 fine adjustment
Diagonal 90 degree diagonal with 15mm solar blocking filters
Dovetail Vixen-style
Eyepieces • Coronado CEMAX 12mm (1.25")
• Coronado CEMAX 18mm (1.25")
• Coronado CEMAX 25mm (1.25")
Barlow Lens Coronado CEMAX 2x Barlow (1.25")
Carry Case Black and Gold Hard Carry Case
Dimensions: 68cm x 22cm x 22cm (26.5" x 8.66" x 8.66")
Tripod Not included
Assembled Product Weight 8 kg (17.47 lbs) - no hard case
Assembled Product Dimensions 71cm x 16cm x 18cm (27.9" L x 6.2" W x 7" H) - no hard case
Transit Weight & Dimensions 20 kg, 102cm x 42cm x 42cm
▲ hide specification ▲
1.5 MB • 05 May 2020
0.1 MB • 12 October 2021
19.3 MB • 05 February 2021
0.2 MB • 12 October 2021
Astro images
06 August 2021

The Sun is a 4.6 billion years old star of hot plasma located at the centre of the Solar System. The Sun spins round itself but being a gas giant, it rotates once every 24 days round the equator where it will take more than 35 days for a full rotation near it poles.

14 July 2021

The Sun is located at the centre of the Solar System and is a star formed around 4.6 billion years ago.

17 June 2021

Whether you are focusing on the solar edge or surface features in the chromosphere, the SolarMax III provides razor sharp detail.

29 June 2020

How to get the most out of these scopes covering them in terms of their components, accessories, observation...

17 January 2019

Eyepieces are the most popular telescope accessories. They are used to adjust the magnification of the telescope...

05 June 2018

Meade Instruments has announced four new Coronado solar telescopes in the latest SolarMax III series.

10 August 2017

Find out why the revolutionary Coronado SolarMax II with RichView™ tuning technology brings solar viewing to a whole new level.

29 June 2017

The Coronado Personal Solar Telescope (PST) is the world’s most popular solar telescope.