Coronado Solarmax III 70mm- BF10 Double Stack

Brand: Coronado

SKU : CI-324004

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  • Aperture: 70mm
  • Focal Ratio: F/5.7
  • Focal Length: 400mm 
  • Blocking Filter Aperture: 10mm
  • Wavelength: H-Alpha
  • Solar Filter: 60mm External H-Alpha Etalon

Product Details

  • The SolarMax III (SMIII) 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 SMIII standout?

    The SMIII 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.

    Additionally, the SMIII 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 SMIII 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 favorite solar features without sacrificing image quality.

    Double-Stack Option

    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!”


  • specifications

    Aperture70 mm (2.75")
    Bandwidth0.5 angstrom
    Blocking/ERF Aperture10mm
    Emission LineH Alpha
    Focal Length400 mm
    Focal Ratiof/5.7
    Free ShippingYes
    Optical DesignSolar
    Warranty5 Year Warranty
  • included items

    • Solarmax III 70mm OTA
    • Solarmax III 60mm External Etalon X 2
    • Solarmax III 10mm Blocking Filter
    • Sol Ranger Solar Finder
    • CEMAX 18mm Eyepiece- 1.25"
    • Vixen Style Dovetail Rail
    • 2" Rack & Pinion Focuser - Dual Speed
    • T-Max Tuner
    • Hard Carrying Case

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