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    Flexie's Avatar
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    Question Viewing the Ring Nebula?



    Hi all,
    Just popping the question,
    upon viewing the Ring Nebula in Lyra last night with the 8" dob,
    caught the sight of it but it was pretty small using the 25mm.
    If i were to use say a 10mm or to barlow the 25mm, will it increase the size of the object?

    Cheers,

    Steve,..

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    KathyNS's Avatar
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    Default Re: Viewing the Ring Nebula?

    Yes it will. That's what the shorter focal length eyepieces and barlow lenses are for. However, the price you pay for magnification is a dimmer image. You have the same number of photons entering the scope, but now you are spreading them out over 4 times as many cells in your retina. Each cell gets 1/4 the number of photons.

    It is worth a try if the object is bright enough. The other night, I used a 3x barlow on an 8mm eyepiece to view the Ring. It was pretty dim, but it was impressively big. That was in my f/4 scope, and the seeing was uncommonly good. You wouldn't be able to get away with that particular combination in your scope. However, the point is that it can be fun to give it a try.

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    Default Re: Viewing the Ring Nebula?

    I agree with Keith. In my light polluted skies (red/orange), I've found that the ring is one of the few DSO's that is bright enough to give it some decent magnification. I got it up to 200x about a week ago using a 15mm + 2x barlow and it was still bright enough to see details. I tried other EP combinations, and found 200x to be about the right amount of magnification for my eyes and my skies. I view most other DSOs between 47x (32mm) and 100x (15mm), but mostly the 32mm.
    I'm always learning, so PLEASE correct me if I sound misinformed. I will not be offended if you tell me I'm wrong. Thanks for your patience!
    Celestron 15x70 Binos w/ tripod, Celestron 6SE + 9x50 finder, EP/Filter Kit, Solar filter, f/6.3 reducer, OIII, LP, and UHC filters, NexImage, 8-24mm Zoom EP, Canon T3i
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