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The Sky-Watcher Evostar 100ED (100mm/900mm, f/9) is a highly regarded 4-inch doublet apochromatic refractor featuring FPL-53 extra-low dispersion (ED) glass. It offers excellent, color-free, high-contrast images, making it superb for lunar, planetary, and double-star observation, as well as decent deep-sky astrophotography, at a competitive price point.

Key Features & Specifications:

• Optics: 100mm (3.94") aperture, 900mm focal length (f/9) air-spaced doublet using FPL-53 glass.
• Performance: Almost entirely eliminates false color (chromatic aberration).
• Focuser: 2-inch dual-speed (10:1) Crayford-style focuser, generally smooth, though it may require tension adjustment for heavy imaging loads.
• Build: Aluminum tube (often available in black diamond or white-and-black livery) with fixed dew shield.
• Accessories: 2-inch dielectric diagonal, 8x50 finderscope, tube rings, Vixen-style dovetail, and a metal transport case.
• Ideal Use: High-resolution visual observing of the solar system and, with an optional 0.85x reducer/flattener, capable of deep-sky imaging.

Scope Views +6

Pros & Cons:

• Pros: Outstanding optical quality excellent contrast, lightweight for its size, fast cooldown time.
• Cons: Relatively long focal length (f/9) limits wide-field imaging without a reducer; the non-retractable dew shield makes the tube quite long.
• shipping not included.