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Thread: 20mm erecting eyepiece

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    Default 20mm erecting eyepiece



    My Celestron scope included a 20mm erecting eyepiece. The advantage is that objects are viewed as seen. Are there any disadvantages to erecting eyepieces?
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    Default Re: 20mm erecting eyepiece

    Generally speaking, there is no such thing as right way up in space. That lens will be OK if you want to use your telescope for terrestrial viewing.
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    Default Re: 20mm erecting eyepiece

    Are erecting eyepieces only used for terrestrial viewing?
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    Default Re: 20mm erecting eyepiece

    As I understand it the more lenses the light passes through the more loss and distortion of the image. Ergo the reason why they do not bother putting another piece of glass in a lens group when clarity is paramount. Most camera lenses actually take the photos upside down as well from my understanding but once printed it is of course not a big deal to turn them back over. So the only erecting lenses you are likely to see in use in Astronomy are those in finders (much like cameras ) so you know when you move up the image goes where you move it.
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    Thumbs down Re: 20mm erecting eyepiece

    I have one leftover from my AstroMaster 114EQ Ron. The disadvantage was it's like looking through a long tube with a very narrow FOV. The other disadvantage was when I switched to the 10mm I had to remember to move the OTA in the opposite direction. If I didn't I lost the target I had worked so hard at acquiring in the first place and had to try to hunt it down again.
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    Default Re: 20mm erecting eyepiece

    I got the same eyepiece with my astromaster 114eq, if you unscrew the bottom ring, you can drop the erecting prism out and use the eyepiece as a normal one with a bit less light loss. It worked for me anyways, although you still can't use screw on filters with it so I was glad when i got the 20mm kelner with my R80 and screwed on a new barrel from my previously seldom used 4.5mm so I could use the moon filter with it.

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