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    Will Lyman's Avatar
    Will Lyman is offline White Dwarf
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    Default Review of the University Optics WS 20mm 80 Degree Wide Field EP

    I recently purchased this EP for use in my Orion XT10 Dob. Right out of the box I was impressed with the looks and feels like a quality EP. This was also my first 2" diameter EP, and I was somwhat impressed with the size of the was substantially larger than the 1.25" Plossls I am used to!

    My first observing session began with a little experimentation - I found that the EP would not come to focus unless I used the set screw to hold it in place approximately one-third of the way out. This didn't matter too much, because the EP has a long enough barrel that the assembly was still fairly secure in this configuration. Probably not worth trying to move the mirror up in the cell.

    Once I found focus, I used it to view the Great Orion nebula. I was impressed with the FOV, but there was some distortion at the edges of the field. I'm thinking the XT10 is a fast scope; perhaps the EP would work better in something with a longer focal ratio. In any event, I found I could ignore the issue (the wide field helped) and very much enjoyed the viewing. Overall I recommend the EP to anyone considering purchase.

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    Thank you for the review. Helpful.

    Note that you can get an extension tube for your scope and eyepiece. It doesn't always work out, though. I had the same focus problem with my 14mm ES eyepiece in my XT8. I got a 2 inch extension tube and then I couldn't focus with that - so I just do like you are doing, pull the eyepiece back a bit, secure it, and enjoy.

    But an extension tube might work for you.
    Orion XX12G and XT8; 10 inch LX200GPS;
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    8SE; Tele Vue NP-101is (Petzval apochromat); Meade LS-8; WO GT-71; AVX and Losmandy G-11 mounts.



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