Coronado SolarMax III 70 2.4" F/5.7 solar telescope with 15mm blocking filter

Be the first to review this product


Availability: In stock

The Coronado SolarMax III 70mm solar telescope has a sub-Ångstrom H-Alpha solar filter with unique RichView tuning and a 15mm blocking filter to provide you with first-class views, binoviews, and imaging of solar flares, prominences, and more . . .
Our Product #: SM7015
Coronado Product #: 324005
Recommended Accessories

Product Description

This Coronado SolarMax III solar telescope by Meade consists of a 16.3" long brass and black 400mm focal length 70mm aperture f/5.7 refractor that has been custom-built to optimize the performance of Coronado's unique RichView tuning Hydrogen-Alpha solar filter for visual observing, binoviewing, and imaging.

The Coronado SolarMax III 70 is designed to do much more than merely show you sunspots, as an ordinary white light solar filter can. The SolarMax III 70 will reveal in gorgeous detail the ever-changing tapestry of prominences leaping off the edges of the solar disk, the explosive upheavals of flares on the face of the Sun, and the subtle mottling of granulation across the face of this nearest of stars.

The two-piece solar filter consists of a tunable 60mm etalon and a 10mm clear aperture blocking filter in the scope's 1.25" star diagonal. The solar filter has a <0.7 Ångstrom passband, centered on the 6562.8 Ångstrom H-Alpha line. The sub-Ångstrom passband width gives you an ideal balance of prominence and surface detail alike. The filter is thermally stable, so there is no drifting off the H-Alpha line as the filter heats up during use.

The 15mm clear aperture of the blocking filter built into the star diagonal is designed to provide full disk views of the Sun for visual use and imaging. It also is well suited for binoviewer use and for imagers who need a wider illuminated field for use with larger chip CCD cameras needing a long back focus.

No other commercially available H-Alpha telescope can provide the tuning range and accuracy of the SolarMax III. Now you can tune for the highest contrast views of active regions, flares, filaments, and other surface detail, or quickly and easily re-tune for prominences on the solar limb.

The SolarMax III 70 has a 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.

A Coronado Cemax 18mm 1.25" eyepiece is standard equipment. You can use most 1.25" eyepieces with the Coronado SolarMax III 70, as well. Any good quality 50° field Plössls will work well, as their contrast is generally good and their fields are wide and flat. For optimum solar detail, however, consider adding a 12mm or 25mm (22x) Coronado Cemax eyepiece to your system. Like the supplied 18mm, these Coronado eyepieces use an anti-reflection multicoatings formula that has been optimized for the highest possible contrast during solar viewing of subtle prominence and surface detail. For still higher power views, consider adding the Coronado Cemax 2x Barlow to your system. Like the Cemax eyepieces, its performance and coatings are optimized for solar observing.

A hard carrying case is standard equipment to transport and store the 70mm Coronado SolarMax III. A 1/4"-20 thread tripod adapter socket is built into the scope's split ring system to allow using the 6 lb. SolarMax III telescope on a suitably-sturdy photo tripod, as well as on most astronomical mounts by adding an optional dovetail mounting plate. The supplied Coronado Sol Ranger Sun Finder makes it easy to center the Sun's image in the eyepiece. The Sol Ranger connects to the supplied SolarMax III mounting ring as can be seen in the image above.

A "double stack" version of the SolarMax III 70 is also available that adds a second SolarMax III filter to the front of the scope. Double-stacking the filters improves the scope's already outstanding resolution and contrast by cutting the passband from <0.7 Ångstrom to a very narrow <0.5 Ångstrom. This improves the contrast and visibility of subtle disk features, although it slightly reduces the brightness of prominences.

Tech Details

Aperture 70mm
Binary and Star Cluster Observation No
Focal Length 400mm
Focal Ratio f/5.7
Galaxy and Nebula Observation No
Lunar Observation No
Weight 6 lbs.
Planetary Observation No
Resolution 1.93 arc seconds
Warranty 5 years


How do you rate this product? *

Supplied Accessories

  • 70mm f/5.7 optical tube, <0.7 Ångstrom SolarMax II filter, combined 10mm aperture BF15 blocking filter and 1.25" star diagonal, 18mm Cemax 1.25" eyepiece, lens cover, mounting ring, Sol Ranger finder, hard case.