Sky-Watcher Esprit 120mm ED Triplet Apo Refractor OTA
Availability: Discontinued by vendor. No longer available.
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- 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
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
| Manufacturer | Sky Watcher |
|---|---|
| Product Banner Type | discontinued |
| Free Shipping Graphic | Free Contiguous US Shipping |
| Telescope Focal Length | 801 - 900mm |
| Hide Found a better Shipped Price on Frontend? | No |
- 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
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
| Manufacturer | Sky Watcher |
|---|---|
| Product Banner Type | discontinued |
| Free Shipping Graphic | Free Contiguous US Shipping |
| Telescope Focal Length | 801 - 900mm |
| Hide Found a better Shipped Price on Frontend? | No |