Coronado SolarMax II 90 90mm f/8.8 H-Alpha Double-Stacked Solar Telescope (15mm Blocking, OTA Only)

Coronado SolarMax II 90 90mm f/8.8 H-Alpha Double-Stacked Solar Telescope (15mm Blocking, OTA Only)

Coronado SolarMax II 90 90mm f/8.8 H-Alpha Double-Stacked Solar Telescope (15mm Blocking, OTA Only)

B&H # COS290BF15DS MFR # SMT90DS-15
Coronado SolarMax II 90 90mm f/8.8 H-Alpha Double-Stacked Solar Telescope (15mm Blocking, OTA Only)

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Expected availability: 7-14 business days

Product Highlights

  • Double-Stacked H-Alpha Etalons
  • Patented RichView Tuning
  • Improves Surface and Prominence Contrast
  • 800mm f/8.8 Solar Viewing Refractor
  • 15mm Secondary Rear Blocking Filter
  • 0.7-0.5Å Hydrogen-Alpha Wavelength
  • Sol Ranger Solar Finder
  • 1.25" Helical Focuser / Three Eyepieces
  • Clamshell Mounting Ring
  • OTA Only: Mount and Tripod Required
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Coronado SMT90DS-15 overview

  • 1Description

Coronado's versatile SolarMax II 90 90mm f/8.8 H-alpha Double-Stacked Solar Telescope represents the largest aperture and longest focal length in the SolarMax II series. It offers the highest magnification potential and clearest views by comparison to smaller iterations.

This scope is calibrated for the Hydrogen-alpha wavelength, and comes equipped with Coronado's RichView tuning system. This system allows direct adjustment of each of its etalon filters, enabling it to be tuned up or down from the 6562.8Å wavelength for highlighting specific zones of the chromosphere and to compensate for Doppler shift that can pull prominences and other features off-band and affect views. Tuning areas of concentration back on-band allows for higher-contrast views of prominences on the solar limb.

Its primary internal etalon provides a bandpass of 0.7Å which will reveal prominences in high contrast. Prominences generally appear larger with this size filter than in narrower bandwidths. This version of the SolarMax II comes with a secondary etalon that fits on the front of the OTA and narrows the bandpass to 0.5 Angstroms. At this bandpass, surface contrast is improved versus wider bandpasses. This ability to change the bandpass allows users to see more areas of the Sun than with a single-etalon solar scope. Complementing the etalon filters is a rear 90° 15mm blocking filter. This secondary filter further isolates the H-alpha wavelength for better views. While a smaller blocking filter would suffice, Coronado includes this larger option to allow the use of eyepieces with larger field-stop diameters to be used without vignetting occurrences, as might be seen with smaller filters, which would interfere with the field of view.

The SolarMax II is offered here without a mount or tripod, but comes with a wide clamshell mounting ring that is outfitted with a 1/4"-20 socket for attachment onto many photo/video/field tripods or on piggyback rigs, or an optional Vixen-style dovetail plate is available for use with conventional alt-az, EQ, or motorized telescope mounts.

Optics
  • 90mm aperture
  • f/8.8 focal ratio
  • 800mm focal length
  • Refractor-style lens configuration
Solar Filter
  • Designed for viewing in the hydrogen-alpha wavelength (6562.8Å)
  • Versatile etalon configurations enables easy viewing of both surface detail and prominences
  • Internal primary etalon blocking filter provides a 0.7Å bandpass
  • Narrower 0.5Å bandpass when using included front secondary etalon
  • Rear external 15mm diagonal secondary blocking filter allows for the use of eyepieces with larger field stop diameters without vignetting in the field of view
  • Proprietary RichView tuning system allows the internal etalon to be tuned for Doppler compensation or to highlight specific zones
  • Thermal Stability: 0.005Å/°C
Included Cemax Eyepiece
  • 1.25" diameter barrel
  • 25mm focal length yields 32x
  • Field of view: 52°
  • Fold-down rubber eyecup for use with or without eyewear
  • Designed specifically for use at H-alpha wavelengths
  • 20mm eye relief
Use and Handling
  • 1.25" diameter drawtube
  • Helical focuser with easy-to-use focus collar
  • Sol Range solar viewfinder enables safe aiming of the OTA at the Sun
  • Included carrying case keeps OTA safe during transportation and storage
Mounting
  • Mount and tripod required
  • Mounting ring allows the relative position of the OTA to the mount to be adjusted for comfort and limit obstruction
  • Clamshell mounting ring with 1/4"-20 mount for using photo/video/field tripods or piggyback rigs
  • Optional Vixen-style dovetail plate available for use with conventional telescope mounts
UPC: 709942996326
In the Box
Coronado SolarMax II 90 90mm f/8.8 H-Alpha Double-Stacked Solar Telescope (15mm Blocking, OTA Only)
  • T-Max 60 - Doppler Tuning Unit
  • SolarMax 90 Filter
  • 90mm Secondary H-alpha Etalon
  • Cemax 25mm Eyepiece
  • 90° 15mm H-Alpha Blocking Filter (1.25") vdatveawarqxtyebvwvyafvca
  • CEMAX 18mm H-Alpha Solar Eyepiece (1.25")
  • Sol Ranger Solar Viewfinder
  • Clamshell Mounting Rings
  • Travel Case
  • Limited One-Year Warranty
  • Table of Contents
    • 1Description

    Coronado SMT90DS-15 specs

    Aperture 90 mm
    Focal Length 800mm
    Focal Ratio f/8.8
    Bandwidth Hydrogen-alpha
    Single-etalon: <0.7 Å
    Double-stacked etalons: <0.5 Å
    Thermal Stability 0.005 Å/°C
    Blocking 15 mm
    Finderscope Sol Ranger
    Mount Clamshell ring with 1/4"-20 mount
    Length 30.0" / 76.2 cm
    Weight 23.0 lb/ 10.4 kg
    Packaging Info
    Package Weight 34.34 lb
    Box Dimensions (LxWxH) 41.0 x 13.0 x 12.5"

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