Looking for a portable hydrogen-alpha solar telescope with just a little more room to grow? The Lunt LS40THa/B600 takes everything that makes the LS40 platform popular—light weight, ease of use, and stunning solar detail—and adds a larger blocking filter to unlock more visual flexibility.
Whether you're stepping into solar observing for the first time or adding a compact solar scope to your collection, the LS40THa/B600 gives you performance that punches well above its size.
A Complete Dedicated Solar Telescope
The LS40THa isn’t a converted night scope or a compromise. It’s a purpose-built hydrogen-alpha telescope designed specifically for safe, full-disk solar viewing. From its tilt-tuned internal etalon to its integrated blocking filter and smooth helical focuser, everything about the LS40 is optimized for one thing: delivering jaw-dropping views of our closest star.
Why Choose the B600 Over the B500?
The blocking filter is a critical part of any hydrogen-alpha system—it ensures only the safe, narrow slice of the Sun’s light passes through to your eye. The B600 offers a 6mm clear aperture (versus 5mm in the B500), which provides a wider usable field at the focal plane. That means a bit more flexibility if you’re using eyepieces with larger field stops, planning to add a binoviewer, or simply want edge-to-edge brightness at slightly higher magnifications. If you want just a little more headroom in your visual setup, the B600 version is worth the upgrade.
Tuning Your View of the Sun
The LS40THa uses a tilt-tuned etalon to let you adjust the hydrogen-alpha bandpass. With a simple tilt of the tuning assembly, you can move through different layers of the Sun’s chromosphere to bring out filaments, prominences, or active region structure in finer contrast. Tuning is fast, intuitive, and easy for beginners to grasp.
Portable by Design, Powerful by Nature
With a 40mm aperture and 400mm focal length, the LS40 delivers bright, full-disk views of the Sun—complete with crisp limb detail, dark filaments, and glowing solar prominences arcing high off the edge. And at just 2.6 pounds and under 15 inches long, it’s incredibly easy to take anywhere. Backyard, sidewalk outreach, or national park—it’s ready to go.
Important Safety Warning:
Never look at the Sun through this telescope—or any telescope—without the hydrogen-alpha etalon and blocking filter properly installed. Permanent eye damage or blindness will result. The telescope must be used exactly as designed for safe solar observing.
Simple. Safe. Stunning.
The LS40THa/B600 is a perfect introduction to hydrogen-alpha astronomy that doesn’t cut corners. It’s also an outstanding second scope for solar veterans who want a more portable companion to their larger systems. With rock-solid engineering and sharp, contrast-rich optics, it’s a scope you’ll keep using long after your first solar session.
What’s Included:
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Lunt LS40THa 40mm hydrogen-alpha telescope
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Internal tilt-tuned etalon
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B600 blocking filter in 1.25" diagonal
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Helical 1.25" rear focuser
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Threaded objective cover
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Foam-lined storage box
