Coronado® SolarMax III 90 Double Stack

With RichView Tuning System.

Introducing Meade’s new and improved Coronado SolarMax III Double Stack Hydrogen – alpha solar telescopes!

Choice of Blocking Filter

The SolarMax III Double Stack is a 90mm F/8.8 refractor equipped with two 90mm external hydrogen – alpha (H-α) filters. These double-stacked (<0.5Å) bandpass models is available with either 15mm or 30mm blocking filter. What makes the SolarMax III standout?

Two-Speed Focuser

The SolarMax III 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.

“True” H-α Etalon Filters

Additionally, the SolarMax III 90 Double Stack includes only external “True” H-α etalon filters giving higher contrast views and sharper features compared with models using smaller internal H-α etalon designs. Experience darker backgrounds, sharper features, and higher contrast with the new SolarMax III series telescope.

RichView Tuning

The SolarMax III 90 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-α 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 favorite solar features without sacrificing image quality.

Day and Night

These Double Stacked models (<0.5Å bandpass) include two “True” external etalon filters. One etalon filter equipped with our patented RichView tuner and second etalon with tip-tilt tuning using Coronado’s T-Max tuner. 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 both etalon filters are now external to the telescope, you can easily remove both filters 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!

Note: This telescope should NEVER be used to observe the Sun without the Etalon Filter AND Blocking Filter fitted. Otherwise, immediate and irreversible eye damage may result.

Complete Package

The new Coronado 90 SolarMax III Double Stack series telescopes with enhanced rack & pinion focuser and large external etalon(s) are now the perfect way to view the Sun! The SolarMax III 90 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 Aluminum Hard Carry Case.

Models and Prices

SolarMax III 90 Double Stack
15mm Blocking Filter
SolarMax III 90 Double Stack
30mm Blocking Filter
Opticstar Retail Price £6,230.00 £7,250.00
Purchase at
Product Code 324012 324014
Clear Aperture 90mm 90mm
Optical Design Achromatic Refractor Achromatic Refractor
Optical Coatings Fully Multi-Coated Fully Multi-Coated
Double Stacked Solar Filter 90mm External Hydrogen-Alpha Etalon with Patented RichView Tuning &
T-Max Tuner 90mm External Hydrogen-Alpha Etalon with T-Max Tune
Etalon Filter Bandpass <0.5 angstrom hydrogen-alpha (Hα) bandpass
Thermal Stability 0.005 Å / °C 0.005 Å / °C
Blocking Full blocking > 10-5 from EUV to far IR
Focal Length 800mm 800mm
Focal Ratio f/8.8 f/8.8
Etalon Filter Aperture 90mm 90mm
Blocking Filter Aperture 15mm 30mm
Tuning System RichView RichView
Viewfinder Sol Ranger™ Sol Ranger™
Focuser Mechanism 2" Rack and Pinion with 10:1 fine adjustment
Diagonal 90 Degree Diagonal with Solar Filters. 90 Degree Diagonal with Solar Filters.
Can be reconfigured to a straight through design.
This is ideal for imaging and for use with 2" accessories.
Dovetail Vixen-Style Vixen-Style
Eyepieces CEMAX 12mm, 18mm, 25mm eyepieces and CEMAX 2x Barlow
Hard Carry case 5.9 kg; 89 cm x 27 cm x 25.4 cm (12.9 lbs; 35" x 10.6" x 10")
Assembled Product Dimensions 71 cm x 16 cm x 18 cm (27.9" L x 6.2" W x 7") - without the hard case
Assembled Product Weight 8 kg (17.5 lbs) 8 kg (17.5 lbs)
Transit Package Dimensions T.B.C.
Transit Package Weight T.B.C. T.B.C.

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