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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.
Description The ED80 Essential Series Air-Spaced Triplet Refractor is a true apochromatic telescope that reveals celestial wonders like the desola...
View full detailsDescription The Explore Scientific ED102 Essential Series Air-Spaced Triplet APO Refractor Telescope is a true apochromat refractor that reveals o...
View full detailsDescription The Original Classic Explore Scientific ED127 Air-Spaced Triplet, Retooled for the Astrophotographer: New precision front cell wit...
View full detailsDescription 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 detailsDescription 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 detailsDescription 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 detailsDescription 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 detailsSolar Photography Starter Package This package is also great for starting your nighttime photography -- called astrophotography. Simply remove the...
View full detailsSolar Photography Starter Package This package is also great for starting your nighttime photography -- called astrophotography. Why buy a triplet...
View full detailsDescription Observing with the ED152 Air-Spaced Triplet FCD1 Series Apochromatic Refractor in Carbon Fiber with genuine HOYA FCD1 ED Glass: Seriou...
View full detailsFeatures This is a field flattener for refractor-type telescopes with a focal ratio of f/5 to f/7 Causes no change to the telescope focal length ...
View full detailsThis ED80-FCD100 comes with the Hybrid 2N1 finder base included (but not installed) Description Reveal celestial wonders like the desolate beauty ...
View full detailsCertified Pre-Owned Refurbished These Certified Pre-Owned items -- including telescopes and accessories -- have been thoroughly inspected by the E...
View full detailsDescription Unlock the wonders of the night sky with the Explore Scientific 0.8x focal reducer and the Air-Spaced Triplet 80-mm FCD-1 Refractor. T...
View full detailsDescription The combination of Explore Scientific's 0.8x focal reducer and FCD-100 80 mm Air-Spaced Triplet Refractor creates a 5-element wide-fie...
View full detailsDescription The combination of Explore Scientific's 0.8x focal reducer and FCD-100 80 mm Air-Spaced Triplet Refractor creates a 5-element wide-fie...
View full detailsDescription The ED80 Essential Series Air-Spaced Triplet Refractor is a true apochromatic telescope that reveals celestial wonders like the desola...
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