![]() And with their 2" Focusers, these telescopes can interchange accessories with larger telescopes which one may take out only on the steadier and more transparent nights.ĮD Glass the air spaced doublet objective lens of the 100 mm ED is designed to provide precise optical color correction, and it is multicoated to improve contrast and transmission across the visual spectrum. Moderate aperture Apos provide a wider span of Field of View than any Reflecting or Catadioptric design with an aperture that can show similar detail, while they can reach the critical 200x threshold of planet and lunar observing that reveals details and changing features from night to night. They can deliver the light gathering and high contrast resolving power necessary to reveal many celestial objects with a very natural almost three dimensional appearance. These Apos get used more often than larger alternatives because they are readily managed, even useful on simple Alt-Azimuth mounts. The 3 inch (75-80mm) Apo refractor is regarded as a highly desirable multipurpose compact telescope - an excellent start into the hobby and a good lightweight alternate for those who own larger telescopes. ![]()
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