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Lunt LS60THa 60mm f/8.33 refractor, 12mm blocking filter, Pressure Tuning

Regular Price: $1,795.00

Special Price $1,495.00

Availability: More on the way

This Lunt 60mm solar telescope with Pressure Tuning and a 12mm blocking filter for both visual observing and high resolution Hydrogen-alpha imaging of explosive solar flares and prominences as well as sunspot and surface features on our nearest star . . .
Our Product #: L60T12P
Lunt Solar Systems Product #: LS60THa/B1200CPT
 

Product Description

This Lunt LS60THa/B1200CPT 60mm solar refractor with 12mm blocking filter represents an economical new approach to serious high resolution Hydrogen-alpha solar viewing and imaging. It has a True Doppler Tuning (Pressure Tuning) system that allows you to shift the scope's passband to either side of the H-Alpha band. This emphasizes features that are moving either towards or away from you, adding a 3D-like component to your viewing.

Pressure tuning has a minimal effect on prominences, due to their being at the edge of the disk, but it clearly improves your view of filaments and active regions on the surface. While looking at a filament at the center of the Sun, for example, you have the ability to Doppler shift from the base of the filament to the tip. You can follow the filament thru its structure toward you and away from you. This allows for enhanced visual and imaging capability for the observer as well as a research tool for the avid hobbyist.

This Lunt LS60THa/B1200CPT consists of a 500mm focal length 60mm aperture f/8.33 refractor with an integrated Hydrogen-alpha solar filter. The two-part filter uses an internal etalon behind the objective lens and a 12mm blocking filter built into the standard equipment 1.25" star diagonal. There is also an infrared reflecting window (Energy Reflecting Filter or ERF) in the optical path to remove unwanted heat from the system. A turn or two of the Pressure Tuning mechanism built into side of the system lets you center the passband precisely on the H-alpha line for maximum contrast, as well as quickly perform off-band observations of Doppler-shifted disk features.

The scope's singlet objective lens is fully multicoated. It is not necessary to use an achromatic doublet in a small solar scope to correct for chromatic aberration in the violet end of the visible spectrum. Solar scopes are designed to observe only a single wavelength of red light at the opposite end of the spectrum and all other portions of the visible spectrum are filtered out. Why pay for two lenses to cure a problem in violet light that a solar scope is incapable of showing you in the first place? In addition, the front singlet lens design reduces the stray light of a two-lens achromat by half. With the matched collimation lens set built into the scope, it also fully corrects for on-axis coma, astigmatism, and de-centering aberrations and provides a spherically corrected flat-field image.

The filter has a <0.75 Ångstrom passband, centered on the 6562.8 Ångstrom H-alpha line. The sub-Ångstrom passband width gives you balanced views of feathery prominences and low-contrast surface detail alike. The filter is thermally stable, so there is no drifting off the H-alpha line as the filter heats up during use.

In addition to superb visual observing, the 12mm clear aperture of the blocking filter portion of the H-alpha system in the star diagonal is ideally suited to DSLR imaging of the approximately 4.5mm diameter prime focus image of the Sun. This 12mm diameter blocking filter is also well suited for binoviewer use. However, for those who are interested primarily in visual observing, with little or no imaging, the smaller 6mm aperture blocking filter used in the Lunt #L60TP will provide identical visual results at a lower cost.

This Lunt LS60THa/B1200CPT uses a dual-speed Crayford focuser with a 10:1 reduction ratio for precision focusing on the smallest of solar details. Large ribbed focusing knobs make it easy for you to reach a precise focus, even if you are observing in the dead of winter while wearing gloves or mittens.

You can use virtually any 1.25" eyepieces with this 60mm Lunt solar refractor. A typical 20mm 1.25" Plössl will give you a magnification of 25x and a little over a 2° field of view compared with the 0.5° diameter disk of the Sun. A 15mm Plössl will give you 33.3x and about a 1.5° field, giving you plenty of dark sky background around the solar disk to show off the prominences.

This Lunt LS60THa/B1200CPT comes with a clamshell-type mounting ring with 1/4"-20 thread holes that will let you mount the scope directly on a photo tripod for a quick peek at the Sun. You can also mount the clamshell ring on a dovetail plate and install it on an altazimuth or equatorial mount with slow motion controls for easier extended observing and tracking of the Sun. A foam-lined hard case is standard equipment for transporting and storing your Lunt scope.

Tech Details

Aperture 2.4"
Binary and Star Cluster Observation No
Focal Length 500mm
Focal Ratio f/8.33
Galaxy and Nebula Observation No
Lunar Observation No
Planetary Observation No
Resolution 1.93 arc seconds
Telescope Type Refractor
Warranty 1 year

Reviews

Review by:
If you are interested in solar observing or imaging the Lunt is simply the best instrument for the job. The craftsmanship is superb and it performs flawlessly. The option to double-stack it is there and definitely suggested. (Posted on 10/4/2019)
Review by:
Ok, this review will be a long one cause there's lots to say about this scope and Lunt, i bought a used LS60 tilt tuned a couple of years ago, then shipped it off to Lunt for a pressure tune retrofit which they did so well and timely. This scope is a dream to use in every way, it is beautifully built and finished, weighs like it means business, is made in the USA which is all i really need to say but i need to elaborate a bit. It is so darn well constructed, i held it like it was a newborn, a beautiful scope and you feel it in its weight, the views through it are fantastic, seeing a solar flare (among other amazing features) with your own eyes is indescribable the first time you see it. Another very important feature is Lunt's customer service, i have had such a great experience with their people, rarely does a company show the level of care they showed while my scope was away getting retrofitted, i can't say enough about their customer service. (Posted on 12/18/2018)
Review by:
I believe the Lunt 60 Pressure-tune is the way to go with an all-around solar scope. The Crayford focuser, once its tension knob is adjusted just right, is a good enough choice to use both visually and for imaging. And so is the scope! (Posted on 10/7/2018)
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Supplied Accessories

  • Dual-speed Crayford focuser
  • Dust cover
  • Carrying case
  • Pressure Tuning system
  • 1.25" star diagonal with integral 12mm blocking filter
  • Clamshell mounting ring