Altair Lightwave 5mm LER 1.25" Planetary Eyepiece
Altair Lightwave 5mm Long Eye Relief 1.25" Planetary EyepieceThe Altair Lightwave 5mm Planetary Long Eye Relief Eyepiece delivers high power with a short focal length telescope, such as a small refractor, so it's ideal for high power planetary or lunar observing.
The 7-element, 4 group computer optimized design, a very smooth polish, and fully multi-coated optics deliver exceptional contrast and clarity. The 55° apparent field of view is flat, and well corrected.
20mm of Long Eye Relief means you can position your eye 20mm from the eyepiece rear lens, making this is a very comfortable eyepiece for beginners and experienced observers alike, whether or not you're wearing glasses. This helps you spend more time observing fine details on the planets or moon without fatigue.
Altair staff comment: "We have tested this product extensively, and when you consider the long eye relief feature, this is the best value "high power" eyepiece in our range to date. We recommend them for the Starwave and Lightwave, Wave Series and our Newtonians up to 6."
Apparent field of view 55° degrees
Focal Length 5mm
Barrel OD 1.25" with filter thread
Fold-down eyecups & rubber grip
Eye relief 20mm
Design 7 elements in 4 groups
Coatings FMC Fully Multi-Coated
Divide the telescope focal length in mm by the eyepiece focal length in mm to get the magnification.
Here's an example magnification table for popular telescopes:
Telescope type: Focal Length: 3mm LER: 5mm LER: 6mm LER:
Starwave 70ED F6 420mm 140x 84x 70x
AA80mm EDT F6 Refractor 480mm 160x 96x 80x
SW102mm F7 Refractor 714mm 238x 143x 119x
Altair 6" F5 Newtonian 760mm n/a 152x 127x
Altair 6" F6 Newtonian 912mm n/a 182x 152x
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