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Lunt Solar Systems' LS50THa 50mm f/7 Refractor Solar Telescope is ideally suited for beginner solar observers or as a grab-and-go option for fast sessions. It features a 50mm objective lens and an internal etalon with a <0.75 Angstrom bandpass. The scope is offered here with a 4mm blocking filter in a star diagonal configuration. It fits in the helical focuser and accepts 1.25" eyepieces for visual observation.
Integrating the etalon into the optical path reduces interference and distortion which can occur with externally mounted filters. True Doppler Tuning allows for a shift into and away from the user for a richer depth of field. While looking at a filament at the center of the Sun, the user has the ability to Doppler shift from the base of the filament to the tip, following the filament through its structure toward and away from them, allowing for enhanced visual and imaging capability.
Complementing the optical performance and technologies is a 1.25" helical focuser. This type of focuser has a rotating collar around the filter holder in place of the focusing tube which reduces the overall length of the telescope while maintaining the ability to achieve a fine focus. This solar scope is offered here without a mount or tripod, but is outfitted with a mounting base that has a 1/4"-20 thread for attaching it to most tripods or compatible mounts.
f/7 focal ratio
530mm focal length
Refractor-style optical path
Internal etalon with tune adjustment allows for a <0.75 Angstrom bandpass at 656nm
True Doppler Tuning allows for a shift into and away from the user for enhanced viewing
Use for visual observation only
Fits into focuser and accepts 1.25" eyepieces
Star diagonal configuration
Helical design focuses by turning collar
Reduces obstructions and simplifies use
In the Box
Lunt Solar Systems LS50THa 50mm f/7 Refractor Solar Telescope with 4mm Blocking Filter