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The Lanthanum Eyepiece For Eye Relief
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What will help me with good eye relief besides a Barlow lens?
The Lanthanum Eyepiece For Eye Relief
If you need good eye relief, an alternative to using the Barlow lens is the Lanthanum eyepiece. Eye relief is more than just rest for a stargazer's weary eyes. Eye relief is actually the distance your eye needs to be away from the eyepiece in order to see the entire field of view. Lanthanum is a rare element used to change the refractive index of glass, making an improvement to the design of the eyepiece. If you are a stargazer with astigmatism, you'll find a Lanthanum eyepiece helpful.
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