Coronado SolarMax III 70mm f/5.7 Double-Stacked H-alpha Solar Telescope (15mm Blocking, OTA Only)

Coronado SolarMax III 70mm f/5.7 Double-Stacked H-alpha Solar Telescope (15mm Blocking, OTA Only)

Coronado SolarMax III 70mm f/5.7 Double-Stacked H-alpha Solar Telescope (15mm Blocking, OTA Only)

B&H # COSMIIIDS15T MFR # 324006
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Expected availability: 7-14 business days

Product Highlights

  • Double-Stacked External H-Alpha Etalon
  • RichView and T-Max Etalon Tuning Systems
  • For Prominence and Chromosphere Viewing
  • 400mm f/5.7 Solar Viewing Refractor
  • 15mm Rear Diagonal Blocking Filter
  • <0.5Å Hydrogen-Alpha Wavelength
  • 2-Speed 2" Rack-and-Pinion Focuser
  • Vixen-Style Dovetail Mounting Plate
  • Solar Finder, 18mm 22x Eyepiece
  • Easily Convert for Nighttime Use
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  • 1Description

Redesigned with external dual 60mm solar etalon filters and an upgraded 2-speed 2" rack-and-pinion focuser, Coronado's SolarMax III 70mm f/5.7 Double-Stacked H-alpha Solar Telescope builds on the success of their earlier iterations to provide users with a compact yet capable solar viewing optic. With the primary etalons now positioned externally, users can simply and easily remove the front solar and rear blocking filters to convert the SolarMax III into a competent nighttime viewing telescope - greatly increasing the scope's versatility.

Specifically calibrated to isolate the hydrogen-alpha wavelength with a less than 0.5Å bandpass, the SM3's two etalons reduce the bandpass to refine the observation experience to see prominences in high-contrast against the black backdrop of space while revealing surface granulation and texture that broader bandpasses are unable to resolve. Each etalon has an independent tuning system that gives users the ability to precisely and easily bring them on-band to improve contrast and enhance views when atmospheric interference or Doppler-shift cause the optical system to come off-band. The primary etalon comes equipped with Coronado's rotating RichView tuning system, while the T-max tilt-tuner is employed on the secondary etalon. These two tuning methods ensure that interference between the two light paths is minimized, to further improve views.

The SolarMax III gets an updated focusing system, versus the earlier iteration, with a 2" 10:1 dual-speed rack-and-pinion system from the previous 1.25" helical one. When used as a conventional scope, larger 2" conventional eyepieces and accessories can be used, or the more common 1.25" size with the addition of the included 1.25" reducer adapter. The more precise focuser is complemented by a rear 90° 15mm blocking filter to provide a wider field of view and allows for full-disk viewing even with higher magnification eyepieces. This secondary blocking filter is used to further isolate the H-alpha wavelength for improved contrast on surface granulation, and prominence detail. A larger blocking filter also enables the use of eyepieces with greater field-stop diameters to be used without vignetting occurring, as might occur with smaller-aperture blocking filters.

To get users started, Coronado includes a 2"-to-1.25" reducer adapter and an 18mm 1.25" CEMAX eyepiece that produces a 22x power. The eyepiece holder and blocking filter will accept any 2" solar eyepiece or accessory, and with the reducer adapter any 1.25" eyepiece can also be used — further increasing the scope's versatility. The optical tube assembly is offered here without a mount or tripod, but comes with a Vixen-style dovetail plate for users who already have a reliable and stable mount and support system. To protect the OTA and accessories during transport and storage, Coronado includes a hard carrying case with custom-cut foam lining, that is color-matched to the OTA in their elegant Black and Gold color scheme.

Optical Tube Assembly
  • Use for daytime solar observation; or, with the solar and blocking filters removed, as a conventional nighttime scope
  • 70mm aperture
  • f/5.7 focal ratio
  • 400mm focal length
  • Achromatic refractor-style lens configuration
  • Fully multi-coated optics improve light transmission, color rendition, contrast, and sharpness
  • 10:1 dual speed rack-and-pinion focuser allows for fast coarse and precise fine focusing to achieve tack-sharp images
  • 2" drawtube enables the use of larger eyepieces and accessories for full-disk viewing without vignetting
Solar Filter
  • Double-stacked 60mm aperture solar filter system reduces the bandpass for improved contrast and views
  • Fully external filters, etalons, and tuning systems allow filter to be completely removed
  • Tuned for viewing in the hydrogen-alpha wavelength, at 6562.8Å with a bandpass if less than 0.5Å
  • Reveals prominences in high contrast against the black backdrop of space
  • Observe surface granulation and texture with high-contrast
  • Rear 1.25" 15mm diagonal secondary blocking filter improves contrast, and shows more space around the sun to allow for higher magnification-eyepieces to be used while maintaining full solar-disk viewing
  • Proprietary RichView tuning system on the primary etalon, and the T-max tilt tuner on the secondary, allow the etalons to be independently tuned for Doppler-shift compensation or to highlight specific zones without having the two tuned light-paths interfere with each other
  • Thermal stability: 0.005Å/°C
Mounting
  • Optical tube assembly only — mount and tripod required for proper use
  • Mounting ring assembly allows the relative position of the OTA to the mount to be adjusted for proper balance and limit obstruction
  • Vixen-style dovetail plate available for use with conventional telescope mounts
  • Weight: 9.3 pounds
Included Accessories
    CEMAX eyepiece:
  • 1.25" diameter barrel
  • 18mm focal length yields 22x
  • 52° field of view
  • Fold-down rubber eyecup for use with or without eyewear
  • Designed specifically for use at H-alpha wavelengths to improve contrast and minimize glare
  • Long and comfortable 20mm eye relief
    Sol Ranger viewfinder:
  • Solar finder enables safe aiming of the OTA at the sun
    Carrying case:
  • Protects OTA and accessories during transport and storage
  • Hard aluminum exterior with reinforced corners and edges
  • Dual snap-lock latches with hinged handle
  • Custom-cut interior foam lining
UPC: 709942998351
In the Box
Coronado SolarMax III 70mm f/5.7 Double-Stacked H-alpha Solar Telescope (15mm Blocking, OTA Only)
  • CEMAX 18mm H-Alpha Solar Eyepiece (1.25")
  • Sol Ranger Solar Viewfinder
  • 90° 15mm H-Alpha Blocking Filter (1.25")
  • 1.25" Eyepiece Reducer Adapter
  • Cradle Ring Assembly with Dovetail
  • Hard Carrying Case
  • Limited 5-Year Warranty
  • Table of Contents
    • 1Description
    Aperture 70mm
    Focal Length 400mm
    Focal Ratio f/5.7
    Bandwidth Hydrogen-alpha, 6562.8 Å
    Bandpass <0.5Å
    Thermal Stability 0.005 Å/°C
    Blocking 15 mm, external
    Eyepiece Barrel Diameter 2" from focuser drawtube
    1.25" with blocking filter
    Finderscope Sol Ranger
    Mount Vixen-style dovetail plate
    Dimensions 19.3 x 5.9 x 5.5" / 49.0 x 15.0 x 14.0 cm
    Weight 9.3 lb / 4.2 kg
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