The Sky-Watcher 100mm Esprit 100ED Triplet APO Refractor is a professional instrument for the most demanding and exacting astro-photographers. The air spaced apochromatic triplet lenses use the remarkable Ohara FPL-53 ED (extra low dispersion) glass, with exceptional colour correction over the entire visible spectrum there is no chromatic aberration even on bright objects! Knife edge baffles reduce internal reflections and increase contrast, helping to bring out faint structure in deep sky objects.
A 2-element field flattener is available separately to iron out the natural off-axis astigmatism and field curvature of the objective lens, leaving a fully corrected 42mm field of view.
In The Box:
| Model | SWESPRIT100 |
| Optical Design | Airspaced Apochromatic Triplet |
| Aperture | 100 |
| Focal Length | 550mm |
| Focal Ratio | f/5.5 |
| Diameter of the corrected field | 40mm |
| Visual Back Focus | 185mm |
| Resolving Power | 1.20″ |
| Stellar Limit Magnitude | 12.0 |
| Highest Practical Magnification | 200X |
| Light gathering power (compared to the unaided eye) | 204 |
| Focuser | 3″ Crayford dual speed with 2″ and 1.25″ adaptor |
| Optical Tube Length | 465mm |
| Optical Tube Weight | 6.15kg |
