Coronado 70mm SolarMax III Double Stack Solar Telescope – BF15 – 324006 Coronado

Coronado 70 SolarMax III Double Stack Solar Telescope with RichView Tuning & 15 mm Blocking Filter

Enjoy a bandwidth of <0.5 Angstrom with this double-stack version of the 70 mm SolarMax III Hydrogen-Alpha Solar Telescope from Coronado! The 70mm refractor has a 400mm focal length and an f/ratio of 5.7. It is equipped with two 60mm external hydrogen-alpha etalons, providing higher contrast and sharper features than a double stacked solar scope fitted with an internal and external filter. The external etalons work in conjunction with a 10mm blocking filter situated in a 1.25″ star diagonal. Together, the tunable external etalons and the blocking filter produce a < 0.5 Angstrom passband which yields an optimal balance of prominence and surface detail.

Another great feature of the double-stacked Coronado 70 SolarMax III is the ability to view not only in the <0.5A bandwidth but in the <0.7A bandwidth as well! To accomplish this you would remove the first etalon (the one attached to the telescope OTA) and then replace it with the second etalon for <0.7A viewing. In fact, you can remove both etalons and turn your SolarMax III into a very nice, fast night-time telescope! Only the SolarMax III telescopes can be used in this manner, which makes them very flexible indeed!

Tuning of the first etalon is achieved with Coronado’s patented RichView Tuning and T-Max Tuner. The revolutionary RichView™ tuning method allows you to zero in on the most precise wavelength of light for each area on either side of the hydrogen-alpha (Ha) band, providing the highest contrast views of active regions, flares, filaments and other surface features. With RichView you can also retune the SolarMax III quickly and easily for spectacular images of prominences on the solar limb. No other commercially available Ha telescope provides the tuning range and accuracy of the SolarMax III. A T-Max tuner is included with the second 60mm etalon.

The 70mm SolarMax III is a beautiful instrument, just like all the Coronado SolarMax telescopes. The polished brass and black anodized components complement each other very well, giving the scope a timeless, classy look. The focuser on the SolarMax III is a 2″ rack and pinion model that has dual-speed 10:1 focusing. The ability to make both coarse and fine focus changes will definitely enhance your viewing pleasure.