Coronado® SolarMax III 70 Double Stack

With RichView Tuning System.

Introducing Meade’s new and improved Coronado SolarMax III (SM3) Hydrogen – alpha solar telescopes!

Choice of Blocking Filter

The SolarMax III is a 70mm F/5.7 refractor equipped with 60mm external hydrogen – alpha (H-α) filters. Available in both single-stacked (<0.7Å) and double-stacked (<0.5Å) bandpasses and either 10mm or 15mm blocking filters. What makes the SM3 standout?

Two-Speed Focuser

The SM3 70mm 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 SM3 70mm 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 SM3 70mm 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 favourite 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 70mm 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 70mm SolarMax III series telescope with enhanced rack & pinion focuser and large external etalon(s) are now the perfect way to view the Sun! The SM3 70mm comes with an included 18mm CEMAX eyepiece, Sol Ranger™ Solar Finder, Vixen-style dovetail mounting rail, and an all-new black and gold Aluminium Hard Carry Case.

This very high quality 70mm solar telescope features an 400mm focal length, f/5.7 focal ratio, and a choice of 10mm or 15mm blocking filter. Includes mounting rings, Cemax 18mm eyepiece, Sol Ranger solar finder and black & gold aluminium hard carry case.

Models and Prices

SolarMax III 70 Double Stack
10mm Blocking Filter
SolarMax III 70 Double Stack
15mm Blocking Filter
Opticstar Retail Price £3,295.00 £3,495.00
Purchase at
Product Code 324004 324006
Clear Aperture 70mm 70mm
Optical Design Achromatic Refractor Achromatic Refractor
Optical Coatings Fully Multi-Coated Fully Multi-Coated
Focal Length 400mm 400mm
Focal Ratio f/5.7 f/5.7
Etalon Filters Aperture 60mm (both Etalons) 60mm (both Etalons)
Etalon Filters Bandpass <0.5 angstrom hydrogen-alpha (Hα) bandpass
Blocking Filter Aperture 10mm 15mm
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
Dovetail Vixen-Style Vixen-Style
Eyepiece CEMAX 18mm CEMAX 18mm
Carry case hard case hard case
Assembled Product Dimensions 49.02cm x 15 cm x 14 cm (19.3" L x 5.9" W x 5.5") - without hard case
Assembled Product Weight 4.22 kg (9.3 lbs) 4.22 kg (9.3 lbs)
Transit Package Dimensions 80 cm x 35 cm x 34 cm
Transit Package Weight 11 kg 11 kg

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