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Buy Coronado Solar telescope only at, India's largest telescope store.


Coronado 70mm F/5.7 refractor is equipped with a double stacked set of 60mm external hydrogen-alpha (H-α) filters and features a <0.5Ã… bandpass with a 10mm blocking filter included. What makes the SM3 standout? Read on!

Designed and Manufactured in North America.

It has a new two-speed 2" rack & pinion focuser with both coarse and fine focus controls allowing the user to get a more precise focus, critical for both solar imaging and visual observing. Additionally, the SM3 70mm includes 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.

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. Now you can tune for the highest contrast views of your favorite solar features without sacrificing image quality.

This Double Stacked model (<0.5Ã… 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, this 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!

This very high quality 70mm solar telescope features an 400mm focal length, f/5.7 focal ratio, 10mm blocking filter, and 60mm external Hydrogen-alpha Etalon double-stack with T-max Tuner. Includes mounting rings, Cemax 18mm eyepiece, Sol Ranger solar finder and black and silver Aluminum hard carry case (dimensions 27.8" x 10.2" x 10.2").

CAUTION: Never look at the Sun, either directly or through a telescope, without a professionally made protective solar filter installed that completely covers the front of the instrument, or permanent eye damage could result.

Coronado SolarMax III 70 Double Stack Solar Scope with BF10

Sales Tax Included
  • Best for viewing


    User level


    Optical design


    Optical diameter


    Focal length


    Focal ratio



    Cemax 18.0mm (1.25")

    Magnification with included eyepieces


    Resolving power


    Optical quality

    Diffraction limited

    Finder scope

    Sol Ranger


    2" dual-speed Rack-and-pinion

    Diagonal degrees

    1.25" 90° Blocking Filter Blocking Filter

    Mount type

    Optical Tube without Mount

    Tube material


    Length of optical tube

    19.3 in.

    T-max tuner


    Additional included accessories

    Black and gold hard carry case, Vixen dovetail bar, BF10 blocking filter

    Other features

    Double-stacked etalons for 0.5 angstrom bandpass, Dual-speed focuser

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