Personal Solar Telescope With built-in double-stack <0.5 Ångstrom H-alpha filter

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The Coronado PST double-stack consists of a 400mm focal length 40mm aperture f/10 refractor with a very narrow passband “double-stack” hydrogen-alpha solar filter. The filter uses dual etalons in a double stack configuration (40mm external and 20mm internal) to provide a very narrow <0.5 Ångstrom passband, centered on the 6562.8 Ångstrom H-Alpha line. The narrow passband width provides maximum contrast and visibility of active regions on the solar disk, although with some loss of faint detail in the prominences when compared to the standard single etalon PST.

The filter is thermally stable, so there is no drifting off the H-Alpha line as the filter heats up during use. The 5mm clear aperture of the blocking filter portion of H-alpha system (built into the diagonal housing) is ideally matched to the focal length of the telescope to give full disk views of the Sun. The scope’s achromatic doublet objective lens is fully multicoated. A thread-in metal lens cover protects the objective lens of the PST.

The scope uses proprietary internal optical focusing (operated by the external focusing knob shown in the product feature image). The scope and focuser are a completely integrated unit, with no external moving or extending parts (focuser drawtubes, etc.) to gather dust or grit during windy daytime observing sessions.

A rotary collar on the optical tube allows you to fine-tune the internal etalon for the sharpest and highest contrast image. Do not confuse this collar with the focusing knob on the rear of the right angle filter housing. The fine-tuning collar has a limited range of motion and can be damaged if you try to force it to turn in a vain attempt to focus the scope.

You can use most 1.25” eyepieces with the PST. To get you started observing, a 20mm (20x) 1.25” Kellner comes as standard equipment. While optically acceptable, most observers eventually will want to replace this economy eyepiece with one of better quality. Either a 12mm (33x), 18mm (22x), or 25mm (16x) Coronado CEMAX eyepiece would be an excellent choice for observing, as they are optimized for high contrast solar viewing of subtle prominence and surface detail.

The PST includes an internal modified Coronado Sol Ranger Sun Finder to make it easy to center the Sun’s image in the eyepiece. You can see the Sol Ranger screen in the product feature image. An optional hard case is available to carry and store the PST. The case uses the snug-fitting die-cut foam that the PST ships in to hold the PST securely. A 1/4”-20 thread tripod adapter socket is built into the base of the filter/diagonal housing of the PST to allow mounting the 15” long x 2.1” wide x 3” high telescope on a photo tripod. You can also install the lightweight (3 lb.) scope onto a piggyback camera adapter that’s mounted on a larger scope for motorized tracking.

Focal Length:
This is the length of the effective optical path of a telescopeor eyepiece (the distance from the main mirror or lens where the lightis gathered to the point where the prime focus image is formed). Focallength is typically expressed in millimeters.

The longer the focallength, the higher the magnification and the narrower the field of viewwith any given eyepiece. The shorter the focal length, the lower themagnification and the wider the field of view with the same eyepiece.

Focal Ratio:
This is the ‘speed’ of a telescope’s optics, found by dividing the focal length by the aperture. The smaller the f/number, the lower the magnification, the wider the field, and the brighter the image with any given eyepiece or camera.

Fast f/4 to f/5 focal ratios are generally best for lower power wide field observing and deep space photography. Slow f/11 to f/15 focal ratios are usually better suited to higher power lunar, planetary, and binary star observing and high power photography. Medium f/6 to f/10 focal ratios work well with either.

An f/5 system can photograph a nebula or other faint extended deep space object in one-fourth the time of an f/10 system, but the image will be only one-half as large. Point sources, such as stars, are recorded based on the aperture, however, rather than the focal ratio – so that the larger the aperture, the fainter the star you can see or photograph, no matter what the focal ratio.

This is the ability of a telescope to separate closely-spaced binary stars into two distinct objects, measured in seconds of arc. One arc second equals 1/3600th of a degree and is about the width of a 25-cent coin at a distance of three miles! In essence, resolution is a measure of how much detail a telescope can reveal. The resolution values on our website are derived using the Dawes’ limit formula.

Dawes’ limit only applies to point sources of light (stars). Smaller separations can be resolved in extended objects, such as the planets. For example, Cassini’s Division in the rings of Saturn (0.5 arc seconds across), was discovered using a 2.5” telescope – which has a Dawes’ limit of 1.8 arc seconds!

The ability of a telescope to resolve to Dawes’ limit is usually much more affected by seeing conditions, by the difference in brightness between the binary star components, and by the observer’s visual acuity, than it is by the optical quality of the telescope.

2.9 arc seconds
This is the diameter of the light-gathering main mirror or objective lens of a telescope. In general, the larger the aperture, the better the resolution and the fainter the objects you can see.
The weight of this product.
3.5 lbs.
Telescope Type:
The optical design of a telescope.  Telescope type is classified by three primary optical designs (refractor, reflector, or catadioptric), by sub-designs of these types, or by the task they perform.
5 years
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General Accessories
Altazimuth Mounts (1)
DS Mount For solar observing with Coronado solar scopes
by Coronado Instruments
Telescope Carrying Cases (1)
Carrying Case for PST (Personal Solar Telescope)
by Coronado Instruments
Visual Accessories
Eyepieces (3)
18mm CEMAX 1.25" enhanced for solar viewing
by Coronado Instruments
12mm CEMAX 1.25" enhanced for solar viewing
by Coronado Instruments
25mm CEMAX 1.25" enhanced for solar viewing
by Coronado Instruments
  • Dust cover
  • Built-in solar finder
  • 20mm 1.25" Kellner eyepiece
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Coronado Instruments - Personal Solar Telescope With built-in double-stack <0.5 Ångstrom H-alpha filter

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Coronado Instruments - Personal Solar Telescope With built-in double-stack <0.5 Ångstrom H-alpha filterA closeup of the PST, showing the focus knob at the lower left, the round screen of the built-in sun finder, the rotary collar for fine-tuning the filter performance, and the thread-in lens cap.
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Our Product #: PST5
Manufacturer Product #: 0.5PST
Price: $1,199.00  FREE ground shipping - Click for more info
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MSRP: $1359.00

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Clear skies,

The Coronado Personal Solar Telescope double-stack is a complete solar observing system – telescope, eyepiece, and a very narrow <0.5 Ångstrom passband H-alpha solar filter for enhanced viewing of solar disk detail . . .

. . . our 38th year