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看其网页上是这么介绍的。
Onyx 80EDF - General Features
Premium 80 mm refractor
Celestron's Starbright? XLT high transmission coatings
Celestron combines a Fluorite based, low dispersion glass with high density crown glass for virtually color-free images across the visible spectrum
2" Crayford style focuser minimizes image shift
Rotatable focuser for easy framing of objects for photography
Extendable lens shade reduces glare and protects lens from moisture
Built-in sighting scope to help accurately locate objects
Integrated dovetail compatible with Celestron Computerized "GoTo"
Aluminum case for convenient storage and protection |
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