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Coronado 40mm f/10 0.5Å H-Alpha Personal Solar Telescope



Coronado's iconic PST 40mm f/10 0.5Å H-Alpha Personal Solar Telescope optical system is tuned to the hydrogen-alpha bandwidth with a 0.5Å (Angstrom) bandpass for viewing details of the Sun's chromosphere (surface) and prominences. A bandpass tuner allows users to compensate for Doppler shift or to highlight specific areas or zones.

It is designed and engineered to be set up quickly and used easily. The 40mm external etalon has an easy-to-use tuning ring, while the 30mm etalon primary blocking filter is set internally, so all users need do is mount the OTA on a stable platform and drop in the included 20mm eyepiece. The PST is offered here without a mount or tripod, but it is equipped with a standard 1/4"-20 tripod mount for using conventional photo/video/field tripods, or it can be mounted on many alt-az, EQ, or motorized astronomical mounts.



Optical Performance
40mm aperture
f/10 focal ratio
400mm focal length
Simple focusing ring with 1.25" eyepiece holder
Eyepiece set at 90° to optical tube puts head in a comfortable viewing position when aimed at or near the zenith
Solar Blocking
40mm external tunable etalon
30mm internal etalon primary blocking filter
0.5Å bandpass
-0.005Å/C thermal stability
Tuning ring for external etalon allows for Doppler compensation to improve contrast and highlight specific areas/zones
Tuned for the hydrogen-alpha bandwidth with improved surface contrast and views of prominences
Included Eyepiecs
1.25" diameter barrel
20mm focal length yields 20x magnification
Fold-down rubber eyecup for use with or without eyewear
Mount and tripod required
1/4"-20 mount for using conventional photo, video, or field tripod

SPECIFICATIONS Aperture: 40 mm Focal Length: 400 mm Focal Ratio: f/10 Bandwidth: Hydrogen-alpha Bandpass: <1.0 Å Etalon Filter: 40 mm, external - tunable Blocking: 30 mm, internal etalon Thermal Stability: -0.005Å/C Eyepiece Barrel Diameter: 1.25" Finderscope: Built-in solar viewfinder Mount: 1/4"-20 tripod mount

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