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 included to iron out the natural off-axis astigmatism and field curvature of the objective lens, leaving a fully corrected 42mm field of view. The Sky-Watcher exclusive Helinear Track 11:1 dual speed focuser is rock solid with zero image shift and a 3″ barrel to avoid vignetting. Designed with photography in mind, it sits on two tracks above and below the barrel to prevent flexure with a heavy camera attached, and is fully rotatable to perfectly frame a target on the sensor.

Main Features:

• Premium optical materials
• Short focal length and full frame corrected focal plane
• Excellent field flatness
• Precision linear focuser is standard
• Metallic high-transmission lens coatings
• Light-baffled optical systems
• Telescope tube attachment hardware
• Full-frame Corrected Focal Plane
• Zero detectable Colour Fringing even on Bright Objects
• Knife-edge Baffled Optical System

Optical Design:

• Optical Design: Apochromatic Refractor
• Diameter: 100mm
• Focal Length: 550mm
• F/Ratio: f/5.5
• Highest Practical Power: 150x
• Finder Scope: 8×50 right angle erect finder
• Focuser Diameter: 3″ Linear Power Focuser
• Diagonal: 2″ 90 deg. Dielectric Diagonal with 1.25″ adapter
• Tube Weight: 6.3 kg
• Tube Dimensions: 10.5cmx47cm