April 24, 2024
BST Explorer ED 12mm planetary eyepiece
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- Source eBay UK
BST Explorer ED 12mm 1.25" 60 degree planetary eyepiece This is a really good planetary eyepiece for the money, which anyone who has one will tell you. It's been used just a handful of times and I'm only selling it as I recently got a zoom eyepiece (which covers 12mm). 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.
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