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Lunt Solar 50mm H-Alpha Filter - B1200 for 1.25" Focusers

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Lunt Solar 50mm H-Alpha Filter - B1200 for 1.25" Focusers

Lunt Solar Systems LS50 Hydrogen-Alpha Filter - Front Mount

The new Lunt Solar Systems LS50 Hydrogen-Alpha Filter incorporates a unique design feature which decreases chances of decontaction (breakage) and increases solar filter thermal stability, an important factor since even the slightest temperature change can cause poor h-alpha performance. Since solar prominences tend to fade into the bright background sky at 1.0 angstroms, the Lunt Systems Solar Filter's performance at <0.7 angstroms gives above average contrast and definition. To help achieve greater details than ever before, the Lunt Solar Systems H-Alpha filter can also enhanced by adding a second etalon system (sold separately under "Accessories") to reduce the bandpass of the LS50 H-Alpha to <0.5 angstroms. That's a substantial crisp detail bonus to both photographers and observers! The tighter the bandwidth, the more contrast and details on both prominences and surface features...

Another addition to the Lunt Solar Systems LS50 Hydrogen-Alpha Filter is the supplied B1200 blocking filter. This allows the Lunt H-alpha filter to be attached to any refractor with less than 1200mm of focal length. The Lunt Solar Systems B1200 Blocking Filter houses an additional filter in a 1.25" diagonal. The blocking filter is just as crucial to your safety and the system's performance as the front element of the Lunt LS50 solar package! The secondary blocking filter is based on the focal length of your telescope - because blocking filters shape the spectral output. The Lunt Solar System's B1200 blocking filter will provide a full disk image of the Sun with telescopes which have a maximum of 1200mm of focal length. It is important to chose your Lunt h-alpha filter solar filter carefully, because using a larger blocking filter than necessary to achieve a full disk image in your telescope system may result in image "ghosts" at the edge of the field of view. Because the Lunt 50mm H-Alpha Front Mount Filter is unique, the h-alpha blocking filter is also unique. Lunt will only warranty the safety and/or performance of their solar systems when a Lunt Solar Systems blocking filter is paired with a Lunt Solar Systems Etalon system. Mounting adapter is sold separately.

Lunt Solar Systems LS50 Hydrogen-Alpha Filter Features

  • Included foam-lined protective case.
  • Pearl white finish with black anodized trim.
  • Superior coatings.
  • Lunt Manufacturer Warranty
Lunt Solar Systems Product Number: 50FHA1/B12


Bandwidth<0.7 Angstroms
Blocking Filter Barrel Size1.25"
Emission LineH Alpha
ManufacturerLunt Solar
Optimized For1200mm & Under
Tuner IncludedYes
Warranty5 Year Warranty
Wavelength<0.7 A

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Jim Ferreira

Lunt LS50 Ha Filter

A solid piece of equipment with performance to match. Used exclusively for video viewing and imaging with a 700mm focal length ED refractor, the filter provides excellent resolution, contrasty views of both prominences and the chromospheric features such as filaments and fibrous structure in and active regions. Despite only 50mm aperture, relatively high magnification viewing and imaging is possible in fair to good seeing conditions. Adusting etalon tilt is smooth and repeatable. The blocking filter / diagonal is well built and nicely finished. Resulting images are impressive. Bottom line A first class filter at an entry level price.