Lunt Solar Systems 4" / 102mm f/6.6 ED Doublet Refractor (OTA Only)

Lunt Solar Systems 4" / 102mm f/6.6 ED Doublet Refractor (OTA Only)

Lunt Solar Systems 4" / 102mm f/6.6 ED Doublet Refractor (OTA Only)

B&H # LU102EDD MFR # LE102 OTA
Lunt Solar Systems 4" / 102mm f/6.6 ED Doublet Refractor (OTA Only)

Lunt Solar Systems 4" / 102mm f/6.6 ED Doublet Refractor (OTA Only)

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Product Highlights

  • 4" / 102mm Aperture
  • 714mm Focal Length, f/6.6 Focal Ratio
  • Doublet Refractor Optical Path
  • Extra-Low Dispersion Glass
  • Anti-Reflection Fully Multicoated Optics
  • 2" Crayford Focuser with 1.25" Adapter
  • Soft Foam-Lined Carrying Case
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  • 1Description

Applying their solar-viewing experience and technologies to a nighttime scope, Lunt Solar Systems created the 4" / 102mm f/6.6 ED Doublet Refractor. It employs extra-low dispersion (ED) glass with a doublet lens system to correct for chromatic aberration to virtually eliminate color fringing and comas. Further enhancing the optical properties of the scope are fully multicoated optics that increase light transmission to create bright and clear images. Its 4" aperture and 714mm focal length produce a respectable f/6.6 focal ratio, making it an ideal scope for observing and imaging near-space objects such as the Moon and planets, and brighter deep-sky objects like nebulae, galaxies, and globular clusters.

To ensure users can achieve tack-sharp images, Lunt outfitted the scope with a 2" Crayford-style focuser. Unlike a traditional rack-and-pinion focuser, the Crayford-style uses a steel rod held tightly against the drawtube to provide a toothless friction system that eliminates backlash and enables ultra-fine precision focusing. It features a larger coarse-focus knob and a smaller micro-focusing knob with a 10:1 reduction for ultra-fine focusing capabilities. To expand the usability of the OTA, a 2"-to-1.25" adapter is included for the focuser allowing for a wider array of eyepieces and accessories.

The scope is offered here without a mount or tripod, but can be easily mounted with the addition of an optional Vixen or Losmandy-style dovetail plate. Holes on the top of the OTA provide a mounting point for a user-supplied finderscope.

Optical Performance
  • 4" / 102mm aperture
  • f/6.6 focal ratio
  • 714mm focal length
  • Doublet refractor optical path
  • Anti-reflection fully multicoated optics
  • Extra-low dispersion (ED) glass
  • Corrects for chromatic aberration by focusing all wavelengths to the same point, eliminating color fringing - especially at high magnifications
Focuser
  • Dual-speed Crayford-style
  • 2" diameter drawtube with 1.25" adapter
  • Coarse-focus knob, 10:1 fine-focus knob
  • Crayford focusers use a toothless friction system that allows for super-fine precision focusing without backlash
  • Brass compression ring to protect eyepieces and accessories
  • Etched focusing scale for precise repeatability
  • 1.65" (4.19cm) focus travel
Mounting
  • Requires user-supplied mount and tripod
  • Mounting holes on bottom for plate
  • Mounting holes on top of OTA for finderscope bracket
UPC: 814393021326
In the Box
Lunt Solar Systems 4" / 102mm f/6.6 ED Doublet Refractor (OTA Only)
  • 2"-to-1.25" Adapter
  • Foam-Lined Carry Case
  • Limited Five-Year Warranty
  • Table of Contents
    • 1Description
    Optical Design Refractor
    Aperture 4" / 102 mm
    Focal Length 714 mm
    Focal Ratio f/6.6
    Eyepiece Barrel Diameter 2" directly to focuser
    1.25" with included adapter
    Diagonal None
    Finderscope None
    Tripod None
    Mount Type None
    Power Source N/A
    Optical Tube Dimensions Not specified by manufacturer
    Weight Not specified by manufacturer
    Packaging Info
    Package Weight 21.3 lb
    Box Dimensions (LxWxH) 27.3 x 12.5 x 9.7"

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