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.
-
Original price $ 1,099.99 - Original price $ 1,099.99Original price$ 1,099.99$ 1,099.99 - $ 1,099.99Current price $ 1,099.99| /
Explore Scientific ED102 Essential Series Air-Spaced Triplet APO Refractor Telescope - ES-ED10207-02
Explore ScientificDescription The Explore Scientific ED102 Essential Series Air-Spaced Triplet APO Refractor Telescope is a true apochromat refractor that reveals o...
View full detailsOriginal price $ 1,099.99 - Original price $ 1,099.99Original price$ 1,099.99$ 1,099.99 - $ 1,099.99Current price $ 1,099.99| /Save $ 0.00 Save $ 0.00 -
Original price $ 1,799.99 - Original price $ 1,799.99Original price$ 1,799.99$ 1,799.99 - $ 1,799.99Current price $ 1,799.99| /
Explore Scientific ED127 Essential Series Air-Spaced Triplet Refractor Telescope - ES-ED127075-04
Explore ScientificDescription The Original Classic Explore Scientific ED127 Air-Spaced Triplet, Retooled for the Astrophotographer: New precision front cell wit...
View full detailsOriginal price $ 1,799.99 - Original price $ 1,799.99Original price$ 1,799.99$ 1,799.99 - $ 1,799.99Current price $ 1,799.99| /Save $ 0.00 Save $ 0.00