If you’ve been waiting for an affordable, grab-and-go solar telescope that doesn’t compromise on safety or performance, the Lunt LS40THa/B500 is your ticket to the Sun.
Small in size but big on detail, this dedicated hydrogen-alpha solar telescope opens a whole new world of observing—right in your own backyard, and during the day. With its 40mm aperture, tilt-tuned etalon, and integrated B500 blocking filter, the LS40THa reveals solar prominences, filaments, surface granulation, and active regions in stunning hydrogen-alpha light.
A True Dedicated Solar Telescope
This isn't a converted night scope or a hybrid platform—this is a purpose-built, daylight-only hydrogen-alpha telescope designed from the ground up for safe and detailed solar observing. No switching out parts or guessing if things are installed correctly. If it’s a clear day and the Sun is out, you're ready to observe.
Observing Tip:
Use simple eyepieces with minimal glass elements to increase contrast in solar features. Red and green filters may help accentuate surface granulation or limb detail. Viewing is best during morning hours when the atmosphere is more stable and seeing is steadier.
The Right Blocking Filter for the Right Scope
The B500 blocking filter is an integral part of the LS40’s safe solar system. The "500" stands for a 5mm clear aperture, perfectly matched to the telescope’s 400mm focal length and f/10 optical speed. It gives you a sharp, full-disc view of the Sun that’s perfect for low- to moderate-power observing with standard 1.25" eyepieces.
Tuning the Sun
An internal tilt-tuned etalon allows you to tweak the bandpass to bring out different solar features. Want to enhance prominences on the limb? Or bring more contrast to surface detail and filaments? A simple adjustment lets you dial in the view. And unlike some bulky or clumsy tuning systems, this one is intuitive and compact.
Portable Powerhouse
At just 2.6 pounds and under 15 inches long, the LS40THa is built for grab-and-go observing. Whether you’re setting up on the patio or traveling to a star party, it fits easily in a backpack or small padded case. It’s a favorite for educators, outreach programs, and anyone who wants to experience the Sun without hauling a large, heavy setup.
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.
A Great First Solar Scope — Or a Great Second One
The LS40THa is an outstanding choice for beginners, but don’t let its size fool you. It also makes an excellent secondary solar scope for experienced observers who want something light, fast, and easy to set up. It’s also a great way to monitor the Sun while your larger scope is set up for imaging.
Mechanical Features
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40mm clear aperture hydrogen-alpha telescope
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400mm focal length (f/10)
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Internal tilt-tuned etalon
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B500 blocking filter in 1.25" diagonal
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Rear helical focuser
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Compact, lightweight aluminum optical tube
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Mount not included
What’s Included:
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Lunt LS40THa 40mm H-alpha optical tube
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B500 blocking filter in 1.25" star diagonal
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Rear helical focuser
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Thread-on objective cover
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Foam-lined box
