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Thread: Looking for a 20mm eyepiece

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    Default Looking for a 20mm eyepiece



    Hi all, what is a good 20mm eyepiece to use with my 70mm scope. I have the 20mm that came with the scope but I dropped in on the cement tonight while viewing and when i put it back in the focuser I couldn't get it to focus as good.

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    Default Re: Looking for a 20mm eyepiece

    You didn't really say what kind of budget you are working with, so I recommend you take a look at Agena Astro. They have a ton of 1.25 eyepieces of varying focal lengths as well as many, many 20mm. They will range in price from around $32 to well over $100. So there should be something in there to suit your wallet. One thing you might consider too, is a zoom eyepiece. It will give you 8mm to 24mm in one unit, which will give you a wide range of magnification. The one from Zhumell is reasonably priced and well thought of. Hope this helps:

    1.25" Telescope Eyepieces | AgenaAstro.com

    Zhumell 1.25 Inch 8-24mm Zoom Telescope Eyepiece - Telescope Eyepieces at Telescopes
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    Default Re: Looking for a 20mm eyepiece

    Quote Originally Posted by KT4HX View Post
    You didn't really say what kind of budget you are working with, so I recommend you take a look at Agena Astro. They have a ton of 1.25 eyepieces of varying focal lengths as well as many, many 20mm. They will range in price from around $32 to well over $100. So there should be something in there to suit your wallet. One thing you might consider too, is a zoom eyepiece. It will give you 8mm to 24mm in one unit, which will give you a wide range of magnification. The one from Zhumell is reasonably priced and well thought of. Hope this helps:
    Alan is right on. I think I showed you a pic of my little 70mm refractor with a phone attached. When the phone is removed, a Zhummel 8-24mm zoom gets semi-permanently installed. Quite frankly, the views through that zoom will far surpass those you currently get with the two eyepieces that came with your scope.

    Besides, as your scope collection grows (it will), an 8-24 zoom is very handy to have in the eyepiece case.

    (If you decide to buy the zoom, you'll find that you'll only be completely satisfied with the focus down to 10mm. That's because your scope has a focal ratio of f/10.)

    Clear Skies

    BTW: Another alternative to the Zhummel is the Meade 4000 series 8-24 zoom eyepiece. I have one and reviewed it side-by-side with the Zhummel here: 8-24mm Zoom Eyepiece Comparison… Meade 4000 vs Zhummel
    Last edited by Lowjiber; 03-02-2014 at 01:49 PM. Reason: Added BTW
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    Default Re: Looking for a 20mm eyepiece

    Thanks guys! The first eyepiece kit I bought was the Poweseeker Accessory kit which has a 9mm and 15mm plus the planetary filters and then I bought the Astromaster accessory kit which has the 6mm and a 15mm along with the 2x Barlow. i think they are pretty much crap eyepieces but the were affordable kits to begin with.

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    Default Re: Looking for a 20mm eyepiece

    how is the Meade 07174-02 20mm Super Plossl Series 4000?

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    Default Re: Looking for a 20mm eyepiece

    The meade "4000 super Plossl" is a decent quality (but not premium) Plossl eyepiece. As far as I know the "super" is mostly a marketing term and they are similar when compared with other Plossl's of similar price. Plossl is a classic design pattern for how the lenses in the eyepiece are laid out.

    The Plossl's are fairly simple 4-element eyepieces, but much nicer than the Kellner's that came with your scope. Most of the ones in those kits are also Kellner types (although one of the Astromaster EP's is a plossl). Plossl's are both better corrected, and offer a wider apparent field of view (52 degrees, general) than the Kellners (45 degrees). Plossl's are, in general, a staple of beginner eyepieces. The "bang for buck" on them is really hard to beat. They are also much lighter than some of the more recent designs with 6 or more elements in them.

    The only drawback of Plossl's (beyond costing a bit more) is that the eye relief (how close your eye needs to be to the lens) gets shorter as the focal length of the eyepiece does. Really short focal length Plossl's are pretty much unusable unless you enjoy the feeling of your eyelashes being pushed back by the eyepiece, but just how short varies with personal preference. I do not wear glasses and find my 10mm Plossl (6.3mm of eye relief) usable but mildly annoying, and cannot imagine using a smaller one..

    A 20mm Plossl has 13mm of eye relief, more than enough if you don't wear glasses, and possibly enough if you wear thin-ish lenses (or if you don't have astigmatism, you can just take your glasses off and adjust the focus).
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