Lunt Solar Systems LS100THa 102mm f/7 Refractor Solar Telescope with 12mm Blocking Filter (OTA only)

Lunt Solar Systems LS100THa 102mm f/7 Refractor Solar Telescope with 12mm Blocking Filter (OTA only)

Lunt Solar Systems LS100THa 102mm f/7 Refractor Solar Telescope with 12mm Blocking Filter (OTA only)

B&H # LU100HAT1200 MFR # LS100THA/B1200
Special Order
Expected availability: 7-10 business days

Product Highlights

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

Scope Only

Special Order

Scope and 12mm Blocking Filter Scope and 18mm Blocking Filter

Special Order

Scope and 34mm Blocking Filter

Special Order

SAFETY FIRST: Observing the Sun without the proper protection may result in serious personal injury, including permanent eye damage and blindness, and/or damage to equipment. Never point an optic at the sun without an approved solar filter on the front of the optic. For direct solar viewing, viewing the sun through an optic, or when using cameras with an optical viewfinder, ensure your filter is ISO 12312-2 (also written as ISO 12312-2:2015) certified. Never use photographic neutral density filters for direct solar viewing, viewing the sun through an optic, or when using cameras with an optical viewfinder.

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Lunt Solar Systems LS100THa overview

  • 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. The scope is offered here with a 12mm blocking filter in a star diagonal configuration. It fits in the 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. 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 patented StarLight Instruments 2" FeatherTouch reverse-Crayford dual-speed focuser. This innovative design improves on the standard Crayford through the use of a bearing system to increase the focusing mechanism's contact points to increase load capacities, improve precision, eliminate focus backlash and vibrations. The bearings also require much less torque to move the drawtube forward and back, needing only a feather-light touch.

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
  • Use for visual observation only
  • 12mm aperture
  • Fits into focuser and accepts 1.25" eyepieces
  • Star diagonal configuration
  • 2" diameter drawtube reduces vignetting with wide-field eyepieces or large imaging sensors
  • Dual speed for fast and precise focusing
  • Patented reverse-Crayford design utilizes four bearings instead of the single bar common in conventional Crayfords
  • Bearing system increases contact with the drawtube to virtually eliminate vibration while increasing load capacity
  • 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 with 12mm Blocking Filter (OTA only)
  • 12mm Blocking Eyepiece Filter (2" Star Diagonal)
  • Tele Vue Sol Searcher Solar Finderscope
  • Aluminum Foam-Lined Carrying Case
  • Limited Five-Year Warranty
  • Table of Contents
    • 1Description

    Lunt Solar Systems LS100THa specs

    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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