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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.
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.