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  1. #1
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    Default Eyepieces for Lunar and Planetary Observing



    FYI for everyone, I ran across this intersting article on Cloudy Nights. It is dated (2004) and someone should have proofread it a bit better, but it is still quite an interesting article. I am certain some will have differing opinions than the author, so take it for what it's worth. Thought some might find it useful when trying to find the best eyepieces for lunar and planetary observing.

    http://www.cloudynights.com/document...yeyepieces.pdf

    And here is another one geared specifically towards 6mm eyepieces for planetary observing.

    6mm Lunar/Planetary Eyepiece Comparison - Review
    Last edited by KT4HX; 10-19-2011 at 04:28 PM.
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    ---------------------------------------------------------------------------
    Astro Sky 17.5 f/4.5 Dob || Apertura AD12 f/5 Dob || Zhumell Z10 f/4.9 Dob
    ES AR127 f/6.5 and ES ED80 f/6 on Twilight-II Mount
    ES 82° 24mm, 18mm; Pentax XW 10mm, 7mm, 5mm
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  3. #2
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    Default

    Hello Alan,

    great review and contest. Unfortunately, some of those excellent EPs have been discontinued.

    Thanks for posting

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default

    Thank you for posting the link...

    While I actually only did a quick scan of the article I saw nothing that I would object to...and I agree completely that using a wide field eyepiece to view the moon or planets is of no advantage at all mainly because the object will actually appear smaller in the eyepiece then it would with a narrow fov eyepiece...you are seeing a heck of a lot more "dark space" with a wide field eyepiece...

    The only thing I noticed and disagree with is his comment on Scts and Maks not being his personal choice (he is entitled to that ) but no Sct or Mak owner ever uses his telescope until after it has cooled down anyway... Once cooled down (or heated up) they are just fine...

    Bob G.
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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    Default

    Quote Originally Posted by j.gardavsky View Post
    Hello Alan,

    great review and contest. Unfortunately, some of those excellent EPs have been discontinued.

    Thanks for posting

    JG
    And that is exactly why I said it was dated. Fortunately, a lot of older, excellent EPs are constantly re-cycled in the used market.
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    ---------------------------------------------------------------------------
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    ES 82° 24mm, 18mm; Pentax XW 10mm, 7mm, 5mm
    ---------------------------------------------------------------------------
    Astronomers: We look into the past to see our future.

  6. #5
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    Default

    Quote Originally Posted by Bob327 View Post
    Thank you for posting the link...

    While I actually only did a quick scan of the article I saw nothing that I would object to...and I agree completely that using a wide field eyepiece to view the moon or planets is of no advantage at all mainly because the object will actually appear smaller in the eyepiece then it would with a narrow fov eyepiece...you are seeing a heck of a lot more "dark space" with a wide field eyepiece...

    The only thing I noticed and disagree with is his comment on Scts and Maks not being his personal choice (he is entitled to that ) but no Sct or Mak owner ever uses his telescope until after it has cooled down anyway... Once cooled down (or heated up) they are just fine...

    Bob G.
    I agree with that Bob. While widefield EPs certainly can give you a "pretty" view, for the planets and the moon, you don't want all that empty space around the object. Much better from a clarity of detail standpoint to have a narrower FOV.

    As to the SCT/Mak issue, I suspected that some, if not many, would differ there. I've always thought (and this is coming from a newt guy) that a slow SCT/Mak should be a killer on planets, provided you allow for adequate thermal stabilization.
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    ---------------------------------------------------------------------------
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    ES AR127 f/6.5 and ES ED80 f/6 on Twilight-II Mount
    ES 82° 24mm, 18mm; Pentax XW 10mm, 7mm, 5mm
    ---------------------------------------------------------------------------
    Astronomers: We look into the past to see our future.

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    Default

    Hello Alan,

    thanks for starting this EP discussion.

    We have had a review of short focus EPs in the German journal Interstellarum 2/2009:
    Antares Speers-Waler 7.2mm, 82deg FOV
    Meade UWA 6.7mm 82deg FOV
    Pentax XW 7mm 70deg FOV
    Televue Nagle Type6 7mm 82deg FOV
    Televue Ethos 8mm 100deg FOV
    William Optics UWAN 7mm 82deg FOV

    The test objects have been the planetary nebula Abel 4 (22arcsec) and the edge-on galaxy UGC 3697 with a 15mag foreground star. The testing scopes have been two fast 14" Newtons f/4.3 and f/4.5. Two independent observers have given the best notes to Pentax XW, followed by Televue Ethos.

    In the middle class (around 100 EUR), the following EPs have been tested by another experienced person (Ronald Stoyan):
    Astro-Professional LE (United Optics?) 9mm 55deg FOV
    Baader Hyperion 8mm 68deg FOV
    Meade Plössl Series 5000 9mm 60deg FOV
    Pentax XF 8.5mm 60deg FOV
    Televue Plössl 8mm 50deg FOV
    Vixen NLV 9mm 45deg FOV

    The test objects have been the Moon, Jupiter, Cr399 open cluster, and the Veil Nebula through a high-end 70mm f/8 Fluoride APO refractor. As expected, the champion has been the Televue Plössl, followed by the Pentax XF and Astro-Professional LE. The Astro-Professional is believed to be APO-corrected with an ED element.

    Hoping to have made a small contribution to the EP issue
    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default

    Thanks JG. Some good info there. As we all know, EPs can generate a really lively discussion as they are a very personal thing. People have different requirements, they have different telescopes, they have varying vision traits. You can have two people look through the same scope with the same EP at the same object, and yet see slightly different things. There really is no substitute for looking through an EP before you buy if at all possible.
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    ---------------------------------------------------------------------------
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    ES AR127 f/6.5 and ES ED80 f/6 on Twilight-II Mount
    ES 82° 24mm, 18mm; Pentax XW 10mm, 7mm, 5mm
    ---------------------------------------------------------------------------
    Astronomers: We look into the past to see our future.

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    Default

    I've gone for the wide field of view to cut down the need to nudge, nudge .
    Aging eyes
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