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

BH #COSMIII15T • MFR #324005
Coronado
Coronado SolarMax III 70mm f/5.7 H-alpha Solar Telescope (15mm Blocking, OTA Only)
Key Features
  • Single External H-Alpha Etalon
  • Patented RichView Etalon Tuning
  • Reveals Prominences in High Contrast
  • 400mm f/5.7 Solar Viewing Refractor
Redesigned with a new external 60mm solar etalon filter and an upgraded 2-speed 2" rack-and-pinion focuser, Coronado's single-etalon SolarMax III 70mm f/5.7 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 etalon 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.
More on the Way
Expected availability: 2-4 weeks
On Display in Store
$2,102.68

Coronado SolarMax III Overview

  • 1Description
  • 2Optical Tube Assembly
  • 3Solar Filter
  • 4Mounting
  • 5Included Accessories

Redesigned with a new external 60mm solar etalon filter and an upgraded 2-speed 2" rack-and-pinion focuser, Coronado's single-etalon SolarMax III 70mm f/5.7 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 etalon 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 0.7Å bandpass for observing prominences in high contrast against the black backdrop of space, the primary etalon comes equipped with their RichView tuning system to improve contrast and enhance views when atmospheric interference or Doppler-shift require you to bring the etalon back on-band. Directly adjusting the etalon enables it to be tuned up or down from the 6562.8Å H-a wavelength to reveal prominence details and compensate for various factors that can pull the prominences and other features off-band and affect 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 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

  • 60mm aperture solar filter
  • Fully external filter, etalon, and tuning system allows filter to be completely removed
  • Tuned for viewing in the hydrogen-alpha wavelength, at 6562.8Å with a bandpass of less than 0.7Å
  • Reveals solar prominences in high contrast against the black backdrop of space
  • 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 allows the etalon to be tuned for Doppler-shift compensation or to highlight specific zones
  • 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: 7.6 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: 709942998344

Coronado SolarMax III Specs

Optical Tube Assembly
Optical DesignAchromatic Refractor
Aperture70 mm / 2.8"
Focal Length400 mm
Focal Ratiof/5.7
FocuserDual-Speed Rack-and-Pinion
Eyepiece Barrel Diameter1.25", 2"
FinderscopeYes
Mounting SystemVixen Style
Filtration
Filtration WavelengthHydrogen-alpha
Bandpass<0.7 Å
Blocking Filter15 mm (External)
Thermal Stability0.005 Å/°C
General
BatteriesNone
GPSNo
Wi-FiNo
Assembled Dimensions16.3 x 5.9 x 4.9" / 32.9 x 15.0 x 12.5 cm
Weight7.6 lb / 3.4 kg
Packaging Info
Package Weight21 lb
Box Dimensions (LxWxH)31 x 13.5 x 13.5"
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