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Long Perng Lanthanum eyepieces

Discussion in 'Eyepieces, Barlows, and Filters' started by Gabby76, Aug 16, 2023.

Long Perng Lanthanum eyepieces

Started by Gabby76 on Aug 16, 2023 at 11:54 AM

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  1. Gabby76

    Gabby76 Well-Known Member

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    Gabby76, Aug 16, 2023
    #1
    https://www.longperng.com.tw/goods.php?act=view&no=253

    On a different forum this topic came up and there is very little reported on them in use and the only retailer I know that sells some of them is Altair Astro.
    Sky At Night did a review of them in 2018 which did not inspire confidence in the Othoscopic claim as they reported edge of field colour and aberations 15-20% out from edge of field....

    The 45 mm would need to be used in a telescope above f/7 as the exit pupil is at f/6.5 is over 7 mm!
    With my f/15.3 it would give a exit pupil of 2.95 mm, great for DSO.

    Has anyone tried these? Comments?
     
  2. sojourneyer

    sojourneyer Well-Known Member

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    sojourneyer, Aug 16, 2023
    #2
    My gosh that is a beautiful eyepiece and a monster on top of that.
    Way too heavy for my little scopes to even consider sadly.
     
  3. Gabby76

    Gabby76 Well-Known Member

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    Gabby76, Aug 16, 2023
    #3
    Depending on the telescope you are using the 18 mm to 40 mm should work in most telescopes.
    The 45 mm is just under 1 lb so not overly heavy considering some common eyepieces available.

    I have some doubts about have well they perform as looking at the supplied numbers some things do not seem right.
     
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