About this product
Designed with the discerning astrophotographer in mind, Sky-Watcher’s top-of-the-line Esprit refractors deliver the kind of imaging performance one would expect from telescopes costing thousands of dollars more. With 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.
| Optical Info |
|
|
| Optical Design |
ED Triplet Refractor |
| Lens Coatings |
Fully Multi-Coated |
| Glass Type |
BK7 (2)/FPL-53(ED) |
| Primary Aperture (mm) |
100 |
| F/Ratio |
5.5 |
| Focal Length (mm) |
550 |
| Observational Info |
|
|
| Dawes Limit |
1.16 |
| Rayleigh Limit |
1.4 |
| Limiting Mag. |
12.5 |
| Minimum Magnification |
14 |
| Maximum Magnification |
197 |
| Light Gathering (compared to next size down) |
56% |
| General Info |
|
|
| Focuser |
3.4" Dual Speed R&P |
| OTA Length (Retract/Ext.) |
18.3"/24.5" |
| OTA Outer Diameter |
5.75" |
| OTA Weight (with accessories) |
16 |
| Accessories |
|
|
| Included Finder |
8x50 RACI |
| Included Diagonal |
2" Dielectric |
| Mounting Accessories |
Rings/D-Rail |
| Included Eyepieces |
None |
| Included Case |
Yes |
| Corrector |
Yes |
