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Thread: Eyepiece question, high mm, 2 inch, want deep space/wide view

  1. #1
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    Default Eyepiece question, high mm, 2 inch, want deep space/wide view



    Hello, I am looking for advice for an eyepiece. I am looking for a high mm number 35-55mm, and a 2 inch lense.
    I want something with a nice field of view.
    Currently I have a Skywatcer 6" Dobsonian.

    I am considering purchasing a 56 mm Meade Series 4000 2" Super Plossl Eyepiece, will this work with my scope?

    It came with a superwide 25mm 1.25" lens and its our favourite.
    I want something to I can peer deeper, wide field of view, want to try a 2 inch as well.... I like the 56 mm price, and the reviews seem good, but not sure about compatibility

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    Default Re: Eyepiece question, high mm, 2 inch, want deep space/wide view

    I had one and it just didn't perform well for me and I used it in my 8"LX200 SCT which is a pretty forgiving scope at f/10. I wanted it to gain a wider field of view but could only get a clear focus in the very center of the eyepiece making it pretty much useless for me. Now I have an Explore Scientific 30mm 82 degree EP and it works wonderfully in all my scopes that will take 2" EPs including my AD12 Dob at f/4.7 It's a little spendy but it performs extremely well.
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    Default Re: Eyepiece question, high mm, 2 inch, want deep space/wide view

    That's very close to the lowest useable magnification for that scope. The exit pupil will be over 7mm, and unless you're in your early 20's, that will be larger than your fully dilated pupil. Also, the image contrast will not be very good, and there is the possibility of seeing the secondary's shadow. I recommend the GSO SuperView 42mm if you're on a budget. It will give you about 28x with over a 2 degree FOV.

    Scott
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    Default

    With a 2" eyepiece, a 30mm 82° AFOV or a 40mm 68° AFOV eyepiece will give you a similar true field of view to the 56mm - they all max out what you can fit in a 2" barrel, but the shorter focal lengths will give you more magnification and a wider AFOV than the 56mm.

    I tried a 56mm in my SCT, but didn't get on well with it - I preferred the wider AFOV of my old Meade 2" 40mm SWA.

    As Scott points out, I'd be wary of the exit pupil in a dob.
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    Default Re: Eyepiece question, high mm, 2 inch, want deep space/wide view

    When you say you want to view 'deeper' do you mean you want a closer look (=higher magnification) ?

    If so then want you need is a small mm EP than your 25 because the higher the mm the less DSO you will actually see, eg: I often can't view any sign of some of the DSO (galaxies, planetary nebula) in my 30mm that are very obvious in my next one up (an Explore Scientific 82deg 18mm) .. Yet even then for things like this I prefer to jump to an 11 to really get 'in there' ..
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