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

Description

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

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

Specifications

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"

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")
CEMAX 18mm H-Alpha Solar Eyepiece (1.25")
Sol Ranger Solar Viewfinder
Clamshell Mounting Rings
Travel Case
Limited One-Year Warranty

SAFETY FIRST: Observing the Sun without the proper protection may result in serious personal injury, including permanent eye damage and blindness, and/or damage to equipment. Never point an optic at the sun without an approved solar filter on the front of the optic. For direct solar viewing, viewing the sun through an optic, or when using cameras with an optical viewfinder, ensure your filter is ISO 12312-2 (also written as ISO 12312-2:2015) certified. Never use photographic neutral density filters for direct solar viewing, viewing the sun through an optic, or when using cameras with an optical viewfinder.

Meade Series 5000 Mega Wide Angle Eyepieces (MWA) (Fully Multi-Coated, 100 Degree AFOV)

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

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