When the designers at Explore Scientific set their sights on creating a top-quality apochromatic refractor that anyone would be proud to own, they decided on a traditional air-spaced triplet optical design in a rugged, adjustable lens cell. With a 5" (127mm) aperture, this Explore Scientific "Essentials Series" ES127 ED triplet refractor gathers 55% more light (with nearly 25% higher resolution) than the more common size 102mm (4") doublet and triplet refractors that often cost nearly as much as the ES127. Explore Scientific 127mm Essential Series Refractor OTA. The Explore Scientific 127 mm f/7.5 ED Air-Spaced Triplet Refractor Telescope has Hoya FCD100 optics for beautifully sharp, high contrast images. Explore Scientific ED127 apochromat refractor Refactors such as the Explore Scientific ED127 apochromat make great all-round instruments, suitable for both visual observing and astrophotography. The optical tube assembly is made of carbon fiber and includes an integrated dew shield on one end and a 2.5" HEX, or hexagonal, dual-speed 10:1 Crayford-style focuser on the other. Not all refractors are the same though, and it’s the quality and design of the main objective lens that is key to their success or failure.
explore scientific 127mm triplet ed apo carbon fiber refractor