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3 maj 2024 · Apochromatic refractors are telescopes that are optimized for astrophotography by correcting the chromatic aberration that occurs with regular refractors. Chromatic aberration is where a colored fringe appears around bright objects.
Here in this “Best Apochromatic Refractor Telescope” article we’ve rounded up 9 of the top APO refractors including triplet APOs of various specifications, and budget. All of these refractors are great for astrophotography of planets, stars, nebulae and other deep-space objects.
A compact apochromatic refractor telescope is lightweight and portable, making it an excellent choice for those familiar with camera lenses. The focal lengths, aperture, and lens diameter are often similar to those of a telephoto camera lens.
ED apochromatic triplet refractor optics: 115mm (4.53") aperture, 805mm focal length, f/7 focal ratio. It uses an FK-61 ED (Extra-low Dispersion glass) center element to reduce spurious color halos and fringing to vanishingly low levels.
Apochromatic ED doublet refractor optics: 120mm (4.72") aperture, 900mm focal length, f/7.5 focal ratio. The ED element is precision-polished from high grade ED (Extra-low Dispersion) glass.
Product Description. Tech Details. Reviews. Supplied Accessories. This Sky-Watcher Evostar 120ED apochromatic refractor has: • 120mm f/7.5 apochromatic doublet optics using an ED element. • dual-speed 2" Crayford focuser with 10:1 ratio fine focusing. • 2" dielectric star diagonal with 2" and 1.25" eyepiece holders.
1 lis 2021 · Weighing in at just 9.4 pounds complete with cradle ring, Vixen-style dovetail mounting plate, integrated carrying handle and a Synta-style mounting shoe for a finder, the scope has a retractable dew shield and a beefy dual-speed focuser.
