Lunt LS60THa 60mm f/8.33 refractor, 6mm blocking filter


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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 . . .
Our Product #: L60T
Lunt Solar Systems Product #: LS60THa/B600C
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Product Description

This Lunt LS60THa/B600C 60mm solar refractor represents an economical new approach to serious high resolution Hydrogen-alpha solar viewing. This Lunt 60mm solar refractor shows 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 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. Best of all, its larger 60mm aperture shows you 50% more solar detail than competitive 40mm solar refractors.

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 6mm 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.

The 6mm clear aperture of the blocking filter portion of the H-alpha system in the star diagonal is ideally matched to the focal length of the telescope for visual observing of the approximately 4.5mm diameter prime focus full disk image of the Sun. While this 6mm blocking filter aperture is well suited for visual observing, DSLR imagers will get better results with the larger 12mm aperture blocking filter used in the Lunt #L60T12, as will those observers using a binoviewer.

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


Review by:
While never cheap, I found this 60mm gave me a consistently better image and more detail than a competing first gen product. Performance wise I don't think you'll be disappointed. I am a strictly visual user so I can not speak to imaging.

I take away one star because the price to me seems a bit high. It does not even come with an eyepiece. The case is fine. But for the price they could throw in a decent 18mm eyepiece and throw in a solar finder.

Still. Recommended. (Posted on 8/23/2019)
Review by:
Since the weekend was coming up and we were supposed to have really good weather, I wanted to give this scope one more try before sending it back. Prior to this I was only getting an orange disk with no proms or detail. It did bother me that I had read reviews online from people saying they were really happy with their tilt-tune 60mm, but I was having the opposite experience (e.g. what the heck was I doing wrong, if anything?).

So, I dug in and read more from members posts regarding the tilt-tune as well as general solar observing. The consensus seemed to be that early morning and late afternoon are the best times to view, while mid-day can tend to be not so good. You also need to shield the daytime light by covering your head with a dark cloth. Somehow in my previous readings I missed these tips and mid-day had been when I was using the 60mm TT. Anyway, I took it out for one last go-around this morning in the hope that it might perform, before packing it up and sending it back and to my astonishment it worked!

It takes a bit more finesse than the PT (which I expected), and you don't get that "doppler" effect (which I can live without), but I was able to see some very nice proms around 4 to 6 o'clock, and was able to see a nice filament just slightly SW of center. There is a definite sweet-spot, but today I could adjust the view to that spot so I could see surface detail across the disk. I've looked through the new Coronado SolarMax III 70mm, and while I think that is a superior solar scope to this, for the price difference you can't go wrong with this one.
(Posted on 7/29/2019)
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Supplied Accessories

  • Dual-speed Crayford focuser
  • Dust cover
  • Carrying case
  • 1.25" star diagonal with integral 6mm blocking filter
  • Clamshell mounting ring