1.25" Starguider BST Explorer Dual ED 8mm Eyepiece For Astronomical Telescopes

1.25" Starguider BST Explorer Dual ED 8mm Eyepiece For Astronomical Telescopes (image 1/4)
1.25" Starguider BST Explorer Dual ED 8mm Eyepiece For Astronomical Telescopes (image 2/4)
1.25" Starguider BST Explorer Dual ED 8mm Eyepiece For Astronomical Telescopes (image 3/4)
1.25" Starguider BST Explorer Dual ED 8mm Eyepiece For Astronomical Telescopes (image 4/4)
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1.25" Starguider BST Explorer Dual ED 8mm Eyepiece For Astronomical Telescopes. Here's some information. The eyepiece uses two separate ED (Extra-low Dispersion) glass elements of different glass types in its optical system to provide exceptional colour fidelity (with astonishingly low levels of chromatic aberration) so that the true colour differences between binary star pairs and planetary surface details are easily visible. It has a 60° field of view which is very flat and it is particularly recommended with telescopes with a f/5, or greater, focal ratio. It is uniformly sharp edge-to-edge, with markedly low astigmatism. Barrel distortion is essentially non-existent, eliminating the annoying "goldfish bowl" effect of distortion of the image which is often seen in some eyepieces when panning across a star field. Each air-to-glass surface in the Explorer eyepiece is fully multicoated for high light transmission and exceptional contrast. This high contrast makes it a good choice for splitting close binary stars, for examining low contrast lunar and planetary detail, and for finding small and faint planetary nebulae against a truly dark sky background. The lens edges are blackened to eliminate internal reflections and further improve contrast. As you would expect, the chrome barrel is threaded for standard 1.25" filters and has read more
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