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  1. #1
    dmatch's Avatar
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    Default High power 2 inch ep's?



    Just a quick question.

    Do 2 inch ep(s) come in short focal lengths? Been browsing a couple of sites and only see short focal lengths in the 1.25" format. Or is it just not feasable to use 2"'ers for short focal lengths?


    Thx

  2. #2
    andyp180's Avatar
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    Default

    yes they do.
    as an example.
    also hyperions can be purchased that are 1.25" and 2" format,all in one.
    you use them in whichever one you want to.
    clear skies,

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    andy

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    revelation 20X80 bino's,camlink tp-2500 camera/bino tripod.
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    ARCHAEOLOGISTS WILL DATE ANY OLD THING

  3. #3
    MitchAlsup's Avatar
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    Default

    Quote Originally Posted by dmatch View Post
    Do 2 inch ep(s) come in short focal lengths? Been browsing a couple of sites and only see short focal lengths in the 1.25" format. Or is it just not feasable to use 2"'ers for short focal lengths?
    The Explore Scientific 9mm ONLY comes in 2" format. It could have been made to fit both 2" and 1.25", but

    Horay for dropping 1.25" compatibility! Truely Horay!

    Something another company with 100 degree EPs should do, and make all the EPs of a line parfocal at the same time.

    Look, the guys with big DOBs, and big SCTs, and BIG refractors do not need to have to find 1.25" adapters somewhere in the "kit" just to use high power EPs--because everything else we carry around with these scopes are 2" {Paracorr, 2X PowerMate, 2" Filters, 2" T-rings,...}.

    BUT for ALL practical purposes, there is no advantage in the size of the delivered image for EPs with focal lenghts shorter than 17mm to need to be in 2" format. A 17mm 100dFoV EP admits a field larger than the inner barrel diameter of a 1.25" EP. A 120 dFoV EP at 13mm would require a 2" barrel to admit such a FOoV.

    In my opinion; Any scope 8" and larger should be serviced by 2" focuser/diagonal,...

  4. #4
    cmeg1's Avatar
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    Consider the Powermate also.Depending on how much mag your scope can handle.They preserve the intended exit pupil of the eyepiece your using it with and also keep the comfortable eye relief, if using them with the lower power eyepieces.Really neat.They have like 2x or 4x.You may run into a weight problem though.My scope has tension handles so was not concerned.
    Last edited by cmeg1; 10-09-2011 at 12:57 AM. Reason: add more

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    w/Telrad
    Ep's: Explore Scientific 82*30,24,18 and 100*14,9 and Televue 4X Powermate

 

 

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