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  1. #1
    weesasuzi's Avatar
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    Default Problem (?) with 10mm eyepiece



    Hi all -- I'm sure this post would feel equally at home in the "Newbies" section but I'll start here. I recently got my Orion XT6i dob, which came with two Plossl eyepieces, a 10mm and a 25mm. The question I have is this...when I use the 10mm eyepiece, I have a lot of trouble getting the object centered and sometimes the view is "chopped off" -- like blurry letterboxes on the sides of the image. This doesn't happen with the 25mm. Not sure if I need to look into purchasing a higher-quality 10mm eyepiece, or if it is operator error. Any advice?

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    Bowling: Something to do while waiting for it to get dark outside.
    Equipment: Kojak (get it, my "Telly-scope") is an Orion XT6i // 10mm and 25mm Plossl EP's // 6x30 RA finder scope
    Proud owner of: star atlas, planisphere, red flashlight, and perpetually confused look on my face!

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    Default

    I think it's just the lack of experience. With your telescope 10mm has 120X power. It's a lot. But if you want an immediate improvement - so called "planetary" wide-field eyepieces are much easier to operate. Available from many makes. Znumell for example.

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    ibase's Avatar
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    Default

    Hi, have you already tried collimating your scope and was it properly cooled down when you used the 10mm? Inadequacy in any or both can cause the blurry object. At a focal ratio of F/8, your scope is a relatively "slow" scope compared to the 8 or 10" versions and should work well with budget-priced eyepieces and the stock 10mm you have should be good with it, don't give up on it just yet, until you've isolated/determined what's causing it to not perform well.

    Best,

    Hernando
    Last edited by ibase; 10-07-2010 at 04:29 PM.

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    Bob327's Avatar
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    Default

    Google "Star testing" and do it on your telescope...I
    'm betting it is pretty much out of collimation ... also good Andys Shot Glass and watch his collimation video ...

    The eyepiece that came with your scope is NOT the greatest BUT it definitely is NOT JUNK... since the 25 works and the 10 does not I have to say collimation, or dew on the primary mirror

    Like ibase noted you scope is pretty darn easy (or less demanding of eyepieces) then the bigger Dobs...

    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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    weesasuzi's Avatar
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    Smile

    Thanks all -- I had some good skies last night so I was out for a while and tried the 10mm again. I had better luck with it last night; in fact, I got an absolutely *glorious* view of Jupiter for a few minutes. I've checked the collimation on my scope several times since I received it and, to my untrained eye, it looks absolutely spot-on. I was able to split Albireo the first time I saw it a couple of weeks ago using the 10mm, so I'm (mostly) confident it isn't the collimation.

    We are supposed to have great clear skies here for the next couple of days so I will keep practicing. Thanks for the reassuring comments...I'm still just thrilled with the scope and I'm glad to know the EP's are "good enough"!

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    Bowling: Something to do while waiting for it to get dark outside.
    Equipment: Kojak (get it, my "Telly-scope") is an Orion XT6i // 10mm and 25mm Plossl EP's // 6x30 RA finder scope
    Proud owner of: star atlas, planisphere, red flashlight, and perpetually confused look on my face!

 

 

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