ED Air-Spaced Triplet APO Refracting Telescopes
Apochromatic (APO) lenses are designed to bring three wavelengths of light (red, green, and blue) into focus in the same plane. In contrast, achromatic lenses are corrected to bring two wavelengths into focus in the same plane.
The classic achromatic doublet made from optical crown and flint glasses bring two colors of light to a common focus. This diagram shows the image forming lens in the front and the correcting lens in the back.
Apochromat optics were first developed by Peter Dolland in 1763. His air-spaced triplet design ushered forth many optical improvements but lacked the use of ED glass that we see in most apochromatic optical designs today. ED glass enhances apochromatic lens design by producing extra-low dispersion of the wavelengths of light passing through it thereby giving an even better apochromatic performance. For more specifications and information on the different types of glass used in Explore Scientific apochromatic triplets, please click here.
Explore Scientific true apochromatic telescopes utilize three air-spaced elements with the ED element in the middle to bring the light of three different frequencies to a common focus, thus mitigating the effects of chromatic aberration.
ED140 FPL53 140mm f/6.5 Air-Spaced Triplet ED APO Refractor Telescope in Carbon Fiber with 3" HEX FocuserExplore Scientific
Description Reveal celestial wonders like the desolate beauty of the lunar terrain, the serene structure of Saturn’s rings or the brightest deep s...View full details$ 5,999.99Sold out
Description Explore Scientific's largest refractor telescope incorporates our true three-element apochromat design the ED165-FPL53 with an apertur...View full details$ 11,999.99
Original Price $ 5,499.99Current Price $ 4,499.99
Description Observing with the ED152 Air-Spaced Triplet FCD1 Series Apochromatic Refractor in Carbon Fiber with genuine HOYA FCD1 ED Glass: Seriou...View full detailsOriginal Price $ 5,499.99Current Price $ 4,499.99Sold out