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Skywatcher AP 100/550 ESPRIT-100ED Professional OTA
A 100mm triplet refractor with dedicated field correction defines Skywatcher AP 100/550 ESPRIT-100ED Professional OTA, combining 550mm focal length, f/5.5 optics, a 3-inch focuser, full-frame coverage, rings, flattener, diagonal, finder, adapter, and hard case.
- 100mm apochromatic triplet refractor
- 550mm focal length, f/5.5 optics
- Dedicated two-element field flattener
- 3-inch dual-speed focuser
- Includes diagonal, finder, adapter, case
In Stock
Description
Capture flat-field full-frame deep-sky images with the Skywatcher AP 100/550 ESPRIT-100ED Professional OTA apochromatic triplet refractor telescope. Designed with a fast f/5.5 focal ratio, this 100mm (3.94 in) aperture astrograph features a 550mm focal length, delivering 1.16 arcseconds Dawes resolving power and reaching magnitude 12.7 for professional astrophotography.
The Skywatcher AP 100/550 ESPRIT-100ED Professional OTA incorporates an air-spaced triplet objective featuring an Ohara FPL-53 Super ED center element paired with Schott glass and 99.5% Metallic High-Transmission Coatings (MHTC). Bundled with a dedicated two-element field flattener, its CNC-machined aluminum body features a 3-inch rotatable Linear Power rack-and-pinion focuser with 1:11 micro-reduction. Weighing 7.40 kg (16.31 lbs), this 100mm triplet refractor delivers a corrected 40mm full-frame image circle.
Key Features of Skywatcher AP 100/550 ESPRIT-100ED Professional OTA
Engineered for professional deep-sky astrophotography and critical apochromatic visual observation, this 100mm Sky-Watcher ESPRIT Super APO refractor pairs FPL-53 triplet optics with a dedicated field flattener. Its 3-inch rotatable focuser and 63mm backfocus ensure pinpoint star profiles across full-frame sensors.
- 100mm (3.94 in) aperture with 550mm focal length and fast f/5.5 optical speed
- Air-spaced triplet objective featuring Ohara FPL-53 Super ED and Schott glass
- Metallic High-Transmission Coatings (MHTC) achieving 99.5% transmission levels
- Dedicated 2-element optical field flattener delivering a 40mm full-frame image circle
- Standard 63mm back focus from dedicated M48 field flattener thread
- 3-inch Linear Power CNC dual-speed rack-and-pinion focuser with 1:11 micro-drive
- 360-degree field rotator, Losmandy 75mm dovetail bar, and heavy-duty tube rings
- 2-inch dielectric diagonal, 9×50 right-angle finderscope, and padded aluminum hard case included
Ohara FPL-53 Super ED Triplet Optics & Dedicated Flattener
The triplet optical prescription combines an Ohara FPL-53 center element with Schott glass to eliminate chromatic aberration completely. Paired with the dedicated two-element field flattener, this professional Sky-Watcher ESPRIT astrograph supports magnifications from 14.3x up to 200x.
3-Inch Linear Power Focuser & 360° Field Rotator
Heavy camera trains require an unyielding, zero-flexure mechanical drawtube. The Sky-Watcher ESPRIT-100ED features a 3-inch CNC-machined rack-and-pinion focuser with 1:11 micro-reduction that supports heavy CCD arrays without slippage. Its integrated 360-degree rotator allows effortless photographic framing, while the Losmandy-style 75mm dovetail bar ensures rock-solid mount integration.
- 3-inch Linear Power CNC dual-speed rack-and-pinion focuser with 1:11 planetary reduction
- Built-in 360-degree mechanical camera field rotator for precise framing composition
- Padded aluminum hard storage case and 2-inch 99% dielectric star diagonal included
Sky-Watcher ESPRIT Series Warranty
The Skywatcher AP 100/550 ESPRIT-100ED Professional OTA is backed by a 2-year limited warranty against material and manufacturing defects. The complete factory package contains the 100ED OTA, dedicated 2-element field flattener, 2-inch dielectric diagonal, 9×50 right-angle finderscope, 28mm LET eyepiece, M48 Canon adapter, and padded aluminum hard case.
Sky-Watcher AP 100/550 ESPRIT-100ED Professional OTA Specs
| Parameter | Specification |
|---|---|
| Brand | Sky-Watcher |
| Full Model Code / SKU / MPN | 10146 (SW-ESPRIT-100) |
| Country of Origin | China |
| Series / Product Line | ESPRIT Professional Super APO Triplet |
| Optical Design | Apochromatic Triplet Refractor (Air-Spaced with 2-Element Field Flattener) |
| Clear Aperture | 100 mm (3.94 in) |
| Focal Length | 550 mm |
| Focal Ratio | f/5.5 |
| Optical Coatings / Substrate Treatment | Metallic High-Transmission Coatings (MHTC 99.5%) |
| Central Obstruction | 0% - Unobstructed Refractor |
| Glass Substrate / ED Element Spec | Ohara FPL-53 Super ED Center Element paired with Schott Glass |
| Corrected Image Circle / Sensor Coverage | 40 mm (Full-Frame Capable with Dedicated Flattener) |
| Standard Back Focus / Flange Focal Distance | 63 mm from dedicated M48 Field Flattener thread |
| Diffraction-Limited Theoretical Resolving Power | 1.16 arcseconds |
| Limiting Visual Stellar Magnitude | 12.7 mag |
| Highest Useful Magnification | 200x |
| Lowest Practical Magnification | 14.3x |
| Focuser Architecture & Reduction Ratio | 3-inch Linear Power CNC Dual-Speed Rack-and-Pinion Focuser 1:11 (360-degree Rotatable) |
| Optical Tube Assembly (OTA) Dry Weight | 7.40 kg (16.31 lbs) |
| OTA Physical Dimensions | 470 mm retracted / 540 mm extended length, 145 mm dew shield diameter |
| Included Mechanical Mounting Interface | Losmandy-style 75mm Dovetail Bar with Heavy-Duty Tube Rings |
| Mount & Drive Type Included | OTA Only (Mount Not Included) |
| Verified Factory In-Box Inclusions | 100ED OTA, Dedicated 2-Element Field Flattener, 2-inch Dielectric 99% Star Diagonal, 9x50 Right-Angle Finderscope, 28mm 2-inch LET Eyepiece, M48 Canon Adapter, Padded Aluminum Hard Case |
| Factory Warranty Coverage | 2-Year Limited Warranty |
| Primary Optical Application & Astronomical Target Profile | Professional Deep-Sky Astrophotography, Flat-Field Wide-Field Astrography, Critical Apochromatic Visual Observation |
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