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- 100 mm apochromatic 3-element refractor
- 550 mm (f/5.5)
- Fully multi-coated
- Thread-on field flattener
- 3.4″ focuser w/micro focus
- 2″ Diagonal with dielectric coatings
- 8×50 RA erect-image finderscope
- Canon camera adapter
- Tube rings with CGE style dovetail bar
- Aluminum foam lined case
- 40mm image circle
- OTA Weight: 16.3lbs.
- OTA Length: 24.5″ Extended and 17.3125″ Retracted
- Back focus: 68.819mm
Designed with the discerning astrophotographer in mind, Sky-Watcher USA’s top-of-the-line Esprit refractors deliver the kind of imaging performance one would expect from telescopes costing thousands of dollars more.
With their three-element air spaced objective lens design, false color is completely eliminated, yielding exceptional contrast and sharpness. The included 2-element field corrector guarantees a flat field across the entire imaging plane. The Sky-Watcher exclusive Helinear Track focusing system provides a smooth, rock-solid focuser with zero image shift.
All Sky-Watcher USA Esprit refractors come with a 8 x 50 right angle finderscope, 2-inch Star diagonal, 2-element field flattener*, camera adapter, D-style dovetail and padded case. Everything you need to get out under the stars.
Specifications
| Optical Design |
ED Triplet |
|---|---|
| Primary Aperture (mm) |
100mm (4″) |
| Focal Ratio |
5.5 |
| Focal Length (mm) |
550mm |
| Glass Type |
Schott/Ohara ED |
| Lens Coatings |
Fully Multi-Coated |
| OTA Length |
Dew Shield Retracted: 18.3″ Dew Shield Extended: 24.5″ |
| OTA Outer Diameter |
5.75″ |
| OTA Weight (with accessories) |
16 lbs. |
| Focuser |
3.4″ Dual Speed R&P |
| Included Eyepieces |
None |
| Included Diagonal |
2″ Dielectric |
| Included Finder |
8×50 Right Angle Correct Image |
| Includes Case |
Yes |
| Mounting Accessories |
Rings/D-Rail |
| Corrector |
Yes, included field flattener. |
| Image Circle (w/ Flattener) |
40mm |
| Other Included Items |
Canon 48mm camera adapter with spacers |
| Dawes Limit |
1.16 |
| Rayleigh Limit |
1.4 |
| Limiting Magnitude |
12.5 |