Designed and purpose-built for solar observation, the Lunt Solar Systems LS100THa 102mm f/7 Refractor Solar Telescope features a large 102mm objective lens and an internal etalon with a <0.7 Angstrom bandpass. The scope is offered here with an 18mm blocking filter in a star diagonal configuration. It fits in the focuser and accepts 1.25" eyepieces or accessories for a wider field of view versus smaller aperture filters or for imaging..
Integrating the etalon into the optical path reduces interference and distortion which can occur with externally mounted filters. Its singlet chromatic lens reduces the stray light over an achromat lens by half, and the matched collimation lens set fully corrects on-axis coma, astigmatism and de-centering aberrations, and provides a spherically corrected flat-field view. 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 2" Crayford-style focuser. This type of focuser is generally more precise than the more common rack-and-pinion system with virtually zero focus backlash. To safely find the Sun in preparation for observing, Lunt includes the Tele Vue Sol-Searcher solar finderscope. With the Sol-Searcher, unlike conventional finderscopes, the Sun shines through a small aperture in the front and projects an image on an opaque screen. When the image on the screen is centered, the Sun should be centered in the eyepiece making it a safe and easy way to locate the Sun without having to look at it unprotected. This solar scope is offered here without a mount or tripod and comes equipped with a 12" Vixen/Losmandy-style dovetail plate that enables it to be mounted on any compatible platform. A foam-lined aluminum hard carrying case is included for safe and secure transport and storage.