The Lunt LS130MT with B3400 straight-through blocking filter is the professional’s choice for high-resolution, full-disk solar imaging with large-format sensors. This configuration pairs Lunt’s largest aperture modular telescope with its largest blocking filter—designed to deliver an unvignetted, high-fidelity hydrogen-alpha light path for advanced imaging setups.
At 130mm aperture and 910mm focal length, the LS130MT provides unmatched resolution and contrast across the entire solar disk. And with the 34mm clear aperture of the B3400 blocking filter, this system accommodates even the largest full-frame sensors without edge falloff, while leaving plenty of room for barlows, telecentrics, and filter wheels in complex imaging trains.
Why Choose the B3400 Blocking Filter?
The B3400 is Lunt’s largest available blocking filter, with a massive 34mm aperture in a straight-through configuration. Unlike diagonal-style filters, the straight-through design is built specifically for imaging—reducing the number of optical interfaces and simplifying alignment in full-frame, multi-element setups. It ensures a flat, wide field of hydrogen-alpha light reaches your camera, with no clipping or vignetting, even when used with large sensors and long back-focus accessories.
For advanced imagers who demand the cleanest possible light path and complete flexibility in configuring their imaging system, the B3400 is the ultimate choice.
Observing Tip:
If you’re working with full-frame sensors or planning to build out a long back-focus imaging train with barlows or filter wheels, the B3400 gives you the headroom you need for a clean, evenly illuminated field. Always allow your scope to thermally stabilize for optimal contrast and resolution in fine solar detail.
130mm of Color-Corrected Power
The LS130MT uses a 130mm f/7 FPL-53 ED triplet objective for outstanding color correction, resolution, and contrast. More aperture means more detail—both on the surface of the Sun and in deep-sky targets after the Sun goes down. Whether you’re imaging active regions in hydrogen-alpha or photographing a globular cluster, the LS130MT delivers sharp, high-contrast performance.
Internal Pressure Tuning for Uniform Illumination
Lunt’s pressure-tuned etalon eliminates the field unevenness often seen with tilt-tuned systems. By adjusting internal air pressure, you can subtly shift the bandpass of the hydrogen-alpha line to bring out different features—like flares, prominences, and filaments—while keeping the image evenly illuminated across the frame. It’s a must-have for professional-level imaging results.
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.
Nighttime Versatility
Once the Sun sets, remove the etalon and blocking filter module and install the included 2" rack and pinion focuser. In minutes, the LS130MT becomes a world-class ED triplet refractor for nighttime astronomy. Its f/7 optical speed and color correction make it a superb performer on planets, the Moon, and deep-sky objects alike.
Mechanical Features
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130mm FPL-53 ED triplet objective
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910mm focal length (f/7)
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Internal pressure-tuned hydrogen-alpha etalon
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B3400 straight-through blocking filter (34mm clear aperture)
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Modular rear assembly for day/night conversion
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Standard 2" rack and pinion focuser included
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Hinged tube rings with Vixen-style dovetail and solar finder handle
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Custom foam-lined hard carry case
What’s Included:
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Lunt LS130MT 130mm FPL-53 ED triplet OTA
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Internal pressure-tuned etalon system
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B3400 straight-through blocking filter
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2" rack and pinion focuser for nighttime use
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Mounting rings, Vixen dovetail bar, and solar finder handle
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Custom hard case with foam insert
