BST Explorer ED 5mm Eyepiece

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BST Explorer ED 5mm Eyepiece 60 deg 1.25" The spec of the eyepiece is given below. Originally purchased for my old TAL reflector scope but have upgraded to a Celeston Nexstar 6SE. The lens is just too powerful and not usable with the 6SE.Purchased from brand new and in excellent condition. Comes with 2 x protection lens caps and original box. Any questions? No, good, bid on............................ Specification This eyepiece has proved very popular with amatuer astronomers, it is unbeatable for performance as a middle of the range eyepiece. 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 read more

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