Coronado 90 SolarMax III Double Stack Solar Telescope
with RichView Tuning & 30 mm Blocking Filter
The 90 mm SolarMax III Double Stack Hydrogen-Alpha Solar Telescope has been designed by Coronado with high-performance solar optics. This 90mm double stack refractor has a focal ratio of f/8.9 and an 800mm focal length. It is equipped with two 90mm 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 30mm 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 90 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!
The 90mm 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.
You can mount the 90mm SolarMax III Solar Telescope on any sturdy mount that accepts a Vixen-Style dovetail. If you plan to do solar photography we recommend a more substantial mount. Give us a shout if you'd like help choosing a mount, imaging camera, or anything else that you might need to make this the perfect solar set-up!
- Coronado 90 SolarMax III Double Stack Solar Telescope w/ 30 mm Blocking Filter
- CEMAX 12 mm Eyepiece
- CEMAX 18 mm Eyepiece
- CEMAX 25 mm Eyepiece
- CEMAX 2X Barlow
- Sol Ranger Finder
- Vixen-Style Dovetail Rail
- 2" Dual Speed Rack & Pinion Focuser
- Black & Gold Hard Carry Case
Dimensions & Specifications
Optical Tube: 90mm Achromatic Refractor
Focal Length: 800mm
Focal Ratio: 8.9
Optical Coatings: Fully Multi-Coated
Solar Filter: 90mm External H-Alpha Etalon
Tuning: RichView Tuning
Thermal Stability: 0.005 A/Cº
Blocking Filter Diagonal: 30mm
Blocking: Full blocking >10-5 from EUV to far IR
Eyepieces: 18mm / 12mm / 25mm Cemax Eyepieces- 1.25"
Solar Viewfinder: Sol Ranger
Focuser: 2" Dual Speed Rack & Pinion with 10:1 Fine Focus
Dovetail Rail: Vixen-style
Hard Carry Case: Included
Dimensions: 31.2" L x 6.2" W x 7" H
Weight: 21.6 lb.
We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.
Return & Exchange Policy
At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.
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