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Lunt LS60THa 60mm f/8.33 solar refractor with 12mm blocking filter

Regular Price: $1,595.00

Special Price $1,195.00

Availability: More on the way

This Lunt 60mm solar telescope provides economical high resolution Hydrogen-alpha images of explosive solar flares and prominences as well as sunspot and surface features in exquisite detail for both visual observing and imaging . . .
Our Product #: L60T12
Lunt Solar Systems Product #: LS60THa/B1200C
 

Product Description

This Lunt LS60THa/B1200C 60mm solar refractor represents an economical new approach to serious high resolution Hydrogen-alpha solar viewing and imaging. This Lunt 60mm solar refractor reveals to you much more of the living Sun than ordinary glass or Mylar white light solar filters that show only sunspots. With this Lunt LS60THa you see and image the violent ever-changing tapestry of multiple prominences leaping off the edges of the solar disk and the explosive upheavals of flares and filaments on the face of the Sun. All of this is visible in addition to sunspots in exquisite detail.

This Lunt LS60THa 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 tuning mechanism built into the system lets you center the passband precisely on the H-alpha line for maximum contrast, as well as perform off-band observations of Doppler-shifted disk features to determine whether they are moving towards you or away from you.

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 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 #L60T will provide identical visual results at a lower cost.

This Lunt LS60THa 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 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 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:
I have had white light filters on SC8 scopes, and owned a Coronado PST for may years. It is great to satisfy the Astro urge during the day when it seems more likely to be clear. It is also amazing to see how fast things can change on the sun, as opposed to deep sky objects. I liked the PST as it was the first Ha scope I had used. Particularly during solar max, it was an amazing experience using it. However, there were several things that made me upgrade to the Lunt LS60THA. Most important is that the PST is a visual scope, the back focus is extremely limited to the point that I could only use certain eyepieces, and any photography was virtually impossible without a barlow or other tricks to extend the back focus point. Second, the focuser (at least on my PST) had a large amount of backlash and was otherwise troublesome. The views thru the PST were good, but the field of view and the small "sweet" spot also made me start looking for an upgrade. I received the Lunt LS60THA about a month ago and have used it about a dozen times. I ordered a 12 mm blocking filter, the stock focuser, but couldn't afford the pressure tuning. I don't know what I am missing without pressure tuning.
I am quite happy with the Lunt. The field of view is large as well as the "sweet" spot. I have already imaged using the scope and it works fine and I find the stock focuser good enough for me. I am not yet an expert on tuning it as compared to the PST (which always needed tuning) it seems the optimal etalon tuning is more gradual than on the PST. I might change my mind on this, but I found it easiest to tune on the prominences and the solar limb rather than on disk features. On the PST, it seemed to need different tuning for the solar disk as compared to the prominences. I'm not sure that is the case for the Lunt, but with more experience we will see. As far as image quality, it is sharp and the Ha features are better than the PST. The prominences are very easy to see (or at least focus on) as compared to the PST. Photography is easy. After a couple of weeks I ordered a the Lunt zoom and found it very worthwhile., it makes experience much better and is worth it. The case that came with the scope is good. You definitely need to buy a sol searcher to find the sun. It is very difficult to center the sun without it. Although some other means could be improvised rather than the sol searcher, the sol searcher is rugged , small, and simple. Overall I highly recommend the scope. The main problem now is that it is solar minimum, so I'm mainly overserving prominences. I find that it is easy to spot even the small prominences that are shown on online sites like GONG (recommended). (Posted on 8/23/2019)
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Supplied Accessories

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