Sky-Watcher Esprit 120mm ED Triplet Apo Refractor OTA # S11420

Our #: T-SW-S11420
Mfg #: S11420
Sale Price: $3,299.00 Our Price: $4,165.00
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Quick Overview

  • Triplet super-apochromatic design
  • Three-element, air-spaced optical assembly virtually eliminates false color
  • 120mm aperture, 840 focal length, f/7 focal ratio
  • 3.4-inch dual-speed rack-and-pinion, Helinear track focuser
  • Rolled steel optical tube with white, glossy finish
  • Included accessories: field flattener, tube rings, D-style dovetail, 8x50 right-angle finderscope, M48 camera adapter, 2-inch dielectric diagonal, and padded hard case

Product Details

Designed with the discerning astrophotographer in mind, Sky-Watcher’s top-of-the-line Esprit 120ED Triplet Super Apo refractor # S11420 delivers the kind of imaging performance one would expect from telescopes costing thousands of dollars more. With the Esprit’s three-element, air spaced objective lens design, false color is virtually eliminated, yielding exceptional contrast and sharpness. Each element is fully multi-coated with Sky-Watcher’s proprietary Metallic High-Transmission Coatings™ (MHTC)™, producing a transmission rate that rivals any refractor on the market.

In addition to superb optics, all Esprits feature exclusive dual-speed, Helinear track focusers, which provide smooth, rock-solid focusing with zero image shift. Using a captain’s wheel design all focusers can be rotated, giving astrophotographers flexibility when framing their image.

As is customary, Sky-Watcher supplies everything you need to get out under the stars, including a 2-element field corrector, which guarantees a flat field across the entire imaging plane. All Esprit refractors also come with an 8x50 right angle finderscope, 2-inch star diagonal, M48 camera adapter, mounting hardware, and padded case.

Specifications:

Optical Info:

  • Optical Design: ED Triplet Refractor
  • Lens Coatings: Fully Multi-Coated
  • Glass Type: BK7 (2)/FPL-53(ED)
  • Primary Aperture (mm): 120
  • F/Ratio: 7
  • Focal Length (mm): 840

Observational Info:

  • Dawes Limit: 0.97
  • Rayleigh Limit: 1.16
  • Limiting Mag.: 12.9
  • Minimum Magnification: 17
  • Maximum Magnification: 236
  • Light Gathering (compared to next size down): 44%

General Info:

  • Focuser: 3.4" Dual Speed R&P
  • OTA Length (Retract/Ext.): 27.4"/31.5"
  • OTA Outer Diameter: 6.875"
  • OTA Weight (with accessories): 22

Accessories:

  • Included Finder: 8x50 RACI
  • Included Diagonal: 2" Dielectric
  • Mounting Accessories: Rings/D-Rail
  • Included Eyepieces: None
  • Included Case: Yes
  • Corrector: Yes

Other Information

  • Country of Manufacture: China
Links & Downloads
Product Guides / Manuals
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