Lunt Solar Systems LS100THa 102mm f/7 Refractor Solar Telescope (OTA only)

Lunt Solar Systems LS100THa 102mm f/7 Refractor Solar Telescope (OTA only)

Lunt Solar Systems LS100THa 102mm f/7 Refractor Solar Telescope (OTA only)

Lunt Solar Systems LS100THa 102mm f/7 Refractor Solar Telescope (OTA only)

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Product Highlights

  • 102mm Objective
  • 714mm Focal Length, f/7 Focal Ratio
  • <0.7 Angstrom Bandpass
  • Singlet Chromatic Lens
  • True Doppler Tuning
  • Scope Only - Blocking Filter Required
  • 2" Crayford Focuser
  • Tele Vue Sol-Searcher Finderscope
  • 12" Vixen-Style Dovetail Plate
  • Includes Foam-Lined Aluminum Case
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  • 1Description

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. To use this scope properly and safely, it must be used with a rear eyepiece blocking filter. It is being offered here without a blocking filter for users who already have one..

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.

Optical Performance
  • 102mm aperture
  • f/7 focal ratio
  • 714mm focal length
  • Refractor-style optical path
  • Internal etalon with tune adjustment allows for a <0.7 Angstrom bandpass
  • Singlet chromatic lens reduces the stray light over an achromat by half
  • Fully corrects on-axis coma, astigmatism and de-centering aberrations
  • True Doppler Tuning allows for a shift into and away from the user for enhanced viewing
Blocking Filter
  • Scope only. A blocking filter is required to safely use this telescope
  • Blocking filters are available separately in a variety of apertures
Crayford Focuser
  • 2" diameter
  • Dual speed for fast and precise focusing
  • Crayford focusers use a toothless friction system that allows for super-fine precision focusing without backlash
  • Tele Vue Sol-Searcher solar finderscope
  • Enables safe solar alignment with the Sun
  • Projects the image through a tiny hole onto an opaque screen
  • Aluminum hard carrying case
  • Custom-cut foam insert for secure fit
In the Box
Lunt Solar Systems LS100THa 102mm f/7 Refractor Solar Telescope (OTA only)
  • Tele Vue Sol Searcher Solar Finderscope
  • Aluminum Foam-Lined Carrying Case
  • Limited Five-Year Warranty
  • Table of Contents
    • 1Description
    Objective Diameter 102mm
    Focal Length 714 mm
    Focal Ratio f/7
    Bandwidth <0.7 Angstrom
    Finderscope Tele Vue Sol Searcher projector finderscope
    Mounting 12" / 30.5 cm, Vixen-style dovetail plate
    Length 25.0" / 63.4 cm
    Weight 12.2 lb / 5.5 kg

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