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  1. #1
    FishinMagician's Avatar
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    Default What EP with 80mm refractor?



    I ordered a 32mm to go with it assuming I would get good images at low power. Is 32mm too big for this scope though? I'm mainly interested in the moon and maybe a few planets. I also ordered a 13% filter for lunar viewing. Is that a good choice?

    Thanks in advance,
    Brian
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  2. #2
    KathyNS's Avatar
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    Default

    What is the focal length of the scope?

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    Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on
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    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
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  3. #3
    FishinMagician's Avatar
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    Default

    Sorry, it's a 350mm focal length (f/4.3).
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  4. #4
    KathyNS's Avatar
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    Default

    So a 32mm EP is a little on the wide side. The down side is that the exit pupil is wider than even young eyes can handle, so you will be losing some light. It's not a huge problem.

    For lunar and planetary observing, you will likely want to use more magnification. You could effectively use a 5mm EP, and even that, you could barlow in excellent conditions. With that kind of range, you could effectively use an 8-24mm zoom.

    With that fast focal ratio, you should be looking at mid- to high-end eyepieces, rather than budget eyepieces.

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  6. #5
    Don Kittrell's Avatar
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    Default

    Hi Brian,

    It sounds like you have the same scope as me. The Orion GoScope. I use an 8-24mm zoom lens. Works great. I also use a 2x barlow to get higher magnification.

    With the 32mm ep the magnification will only be 11x which I think is below the scopes's lowest useful mag (12x I think according to the documentation).

    Don
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