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Thread: 7mm EP choice

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    Default 7mm EP choice



    I'm looking for a 7mm EP for planets and splitting double stars.

    I got tired of being sniped on ebay and decided I would just order what I want. I want to order it today, and am trying to decide betwen a Celestron XCel-LX and a TMB Planetary.

    The TMB is used, and the owner of the shop said she didn't know who it was made by, but she felt it was a good EP and had a wider FOV than she normally expects from a planetary. I got to visit the shop once in person, and trust her opinion very much.
    It seems like the reviews on Xcels are pretty mixed (though I don't know if most of them refer tot he Xcel or Xcel-LX).

    Thoughts?
    Last edited by GunMonkeyINTL; 09-30-2011 at 11:07 AM.

  2. #2
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    Default

    It was designed by Thomas M Back.

    Specifications:
    60 degree fov
    16mm of Eye Relief
    16mm Field stop

    The TMB is a better eyepiece than the Celestron XCel series
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    Default

    Quote Originally Posted by Johann von Hesse View Post
    It was designed by Thomas M Back.

    Specifications:
    60 degree fov
    16mm of Eye Relief
    16mm Field stop
    Got that part. Apparently, though, there are multiple manufacturers of the TMB design- some licensed and some not. I don't understand fully, but there is apparently some serious controversy about the "copies".

    I think I am going to buy the TMB, though. I really like the shop in question and would prefer to order from them whenever I can, and it just so happens that they have an EP that's about exactly what I'm looking for. The EP is pretty cheap ($45, used) and I just want to make sure I'm not going to be dissapointed and end up having to start over looking for another 7mm EP.

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    Default

    I concur with Johann...

    Given the choice the TMB would be my choice mainly because TMB have a very good reputation as well as it being used...better and cheaper is a hared combination to beat...

    That said my 7 mm is a Pentax XW and I love the darn thing...but it sure was not a bargain when I purchased it ...

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    Default

    The TMB Planetary's I've looked thru were very good eyepieces have not used a Celestron so cant comment. As far as being a copy I have not heard of that and not sure how one would tell. Just inspect the glass well for scratches. I've also used a 6.7mm Meade UWA and like it very much and has a wider AFOV , good if your using a dob with no tracking. Good luck
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    Default

    Ordered the 7mm TMB, as well as a 26mm Meade 5000. Free shipping, both for less than $110.

    Thanks for the quick feed-back.

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    Oh well I guess its to late but I have heard some good things on those Expanse wide field eye pieces over at Orion. 66 field of view eye relief 13mm to 17mm
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    Default

    Those will both be good eyepieces-- I own a 9mm TMB and a 6mm TMB and they are both good for planetary viewing.
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    The shop also has a 9mm TMB for the same price, but I already have a 10mm Orion Ultrascopic, so I passed on it.
    If I really like the 7mm, I may call her back and order the 9mm anyway.

    I still don't get the differences between all the different EP designs, or how their strengths/weaknesses factor in my f4 scope, so I'll probably collect them through the hunt-and-peck method that so many others seem to build their collection on.

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    The shop also has a 9mm TMB for the same price, but I already have a 10mm Orion Ultrascopic, so I passed on it.
    If I really like the 7mm, I may call her back and order the 9mm anyway.

    I still don't get the differences between all the different EP designs, or how their strengths/weaknesses factor in my f4 scope, so I'll probably collect them through the hunt-and-peck method that so many others seem to build their collection on

 

 
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