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  1. #1
    msraps's Avatar
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    Default Different Eyepieces



    Hi there,
    Another "silly" question from a Greenhorn.
    With my 8" Dob. 1200 I got several eye pieces Super 10, Super 25 long Eye Relief, A Barlow 2 x adapter and an 2 " Eyepiece Adaptor.
    Can anyone try to explain me the benefits and drawback of the differen asessories pls.
    Clear skies,
    Per.

  2. #2
    Bob327's Avatar
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    Default

    Sounds like normal stuff to me... the barlow will double the magnification you get from any eyepiece so your 10 mm eyepiece will give you 1200x by itself but 240 with the barlow inserted..the 25 mm will give you 48x by itself and 96 with the barlow.. so you have 4 different magnifications available with just 2 eyepieces... Long eye relief (like 17-20) sure helps IF you wear glasses..as you do not have to plant your eyeball onthe eyepiece...

    The 2 inch adapter allows you to use 2 inch eyepieces...which are usually low powered eyepieces ... BTW...I'm betting that you use the 25 more then the 10 as most of us soon discover we use low powers much more then high powered eyepieces...

    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
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    2. make a heck of a lot of sawdust in my wood shop.

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    Cygnus2112 (09-24-2011),Joe Lalumia (09-24-2011),msraps (09-24-2011)

  4. #3
    Jon_Doh's Avatar
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    Default

    The Barlow will convert your 10mm into a 5mm. 5-10mm eyepieces are good for viewing distant planets like Jupiter and Saturn and your 25mm is more useful for viewing the galaxies and nebulas.

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  6. #4
    msraps's Avatar
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    Default

    Hi there,
    Thanks for the info. So, there is no benefit in buying some 2" eyepieces ?

  7. #5
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    Default

    Quote Originally Posted by msraps View Post
    So, there is no benefit in buying some 2" eyepieces ?
    The fact that an eyepiece has a 2" barrel doesn't give it any advantage over a similar eyepiece in a 1.25" barrel.

    However, if you are looking for a wide-angle eyepiece with a wide AFOV, it will probably come in a 2" barrel. That's when you would buy a 2" eyepiece - when it's the one you need.

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  8. #6
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    Default

    ALL...of my higher powered eyepieces (those under 25 mm) are in 1.25 inch format BUT every single one of my lower Powered eyepieces (those 26 mm and higher are in fact 2 inch eyepieces..

    I want a wide FOV when viewing under low power ..whereas I do not need a wide field of view when using high powered eyepieces..BUT MY SCOPES ALL TRACK...

    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.

  9. #7
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    Default

    I want a wide FOV when viewing under low power ..whereas I do not need a wide field of view when using high powered eyepieces..BUT MY SCOPES ALL TRACK...

    Bob G.[/QUOTE]


    Could you explain this a bit, Bob G? Why do you not need a wide field of view when using higher powered eyepieces, and what is the significance of the fact that your scopes have tracking capability?
    Thanks.

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    Default

    Higher powered eyepieces are typically used for viewing small objects, particularly planets. Even with the magnification, the planet only occupies a small portion of the centre of the field of view. Being able to see a lot of empty sky around the planet is not very valuable if you have a tracking mount.

    Without tracking, a wider field of view is useful, because the object will remain visible longer as it moves across the field of view. With tracking, the object stays in the centre, so the wider field is not necessary.

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