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  1. #1
    sandy's Avatar
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    Default My Barlow Came In....Have a Question??



    The weather has been terrible for the past week, but Friday I had a quick chance to use my barlow for the first time.
    I ended up purchasing a TeleVue 2x 1.25" barlow. I went out fairly early and set it up to look at Jupiter. It was still low in the sky.

    When I looked through the scope at it, I could not get it to focus a clear sharp image. Now, that being said, I did put back in the 25mm on its own, and the image wasn't nearly as crisp as normal either...

    Does this sound normal to you folks?

    I am not going to have the chance to use it again for at least a week unless we get a break from this hot stormy summer weather. I had slight concerns about what I should be expecting as far as performance.

    I checked collimation on the scope, and that is perfect...

    I appreciate anyones input.
    Skyquest XT8 Classic
    Lat = 39 degrees N, Long = 74 degrees W

  2. #2
    BobDob's Avatar
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    Hey Sandy! My guess is there was just too much atmospheric ca-ca at the time to get good resolution, especially as the effect was common with the ep., barlowed or not. Let us know how it goes next time out, please.

    Cheers, and clear skies!

    Bob
    6 inch F/5 GEM mounted reflector

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  3. #3
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    Default

    I've gotten some decent views of Jupiter in my location. The last night I was able to go out, Tuesday, the view through the scope was very blurry. My guess is that it was warm and relatively humid that night.
    Astromaster 90EQ. Started observing April 2009. Looking to expand.

  4. #4
    sandy's Avatar
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    Default

    Yes, 85-90 degrees with 80-90% humidity. Would that be the culprit? Hopefully cooler weather will arrive soon!
    Skyquest XT8 Classic
    Lat = 39 degrees N, Long = 74 degrees W

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    Default

    Hi sandy ...You said jupiter was low on the horizon ...That is a lot of air to be looking through ...There could have been pollution and humidity in the air .. Televue stuff is top notch stuff so i doubt it is a problem with the barlow ..Your scope is a good one also ...While i was at the beach a couple of weeks ago it was the same thing for me looking at jupiter ...Once it got higher , it became clearer and i could barlow the eyepiece ..Congrats on getting a new accessorie ...
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    I had my scope out last night... briefly... the seeing was terrible down here. I got some decent looks at the Moon, andthat was about all. Even stubbornly bright M13 looked dim and blurry last night. The atmosphere was boiling, and we had a high thin cirrus layer in places that made seeing constellations difficult.

    If there's one thing I've learned owning a 10" telescope, it's that atmospheric conditions make the biggest difference in what you can see. Try another night, maybe after a high pressure area comes in and the air is clear and stable.
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  7. #7
    sandy's Avatar
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    Default

    Thanks for the info everyone! I will be sure to update everyone once I get to use it on a clear day..
    Skyquest XT8 Classic
    Lat = 39 degrees N, Long = 74 degrees W

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  9. #8
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    Default

    Quote Originally Posted by sandy View Post
    Yes, 85-90 degrees with 80-90% humidity. Would that be the culprit? Hopefully cooler weather will arrive soon!
    Hi Sandy,

    Yep humidity is part of the problem, and like Rich and 7 says, the altitude of the object makes a big difference.

    The great news for us Jupiter lovers is that the planet is rising earlier and so that it is pretty high up by midnight.

    With respect to boiling, I have found that even an additional 10 degrees (one outstretched fist length) of elevation can make a huge difference if Jupiter looks wavy or crisp.

    That is a good Barlow and you will enjoy it.
    Location: 30° 19' N; 97° 54' W; elev 248 meters; yellow/green zone; NELM 5.7
    Instruments: Obsession 15" Dob; Orion XT8i; 2" refractor (Galileoscope); Televue EP arsenal; Bushnell 7X50 binos
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    Default

    The atmosphere was unsteady or exhibited poor seeing conditions as astronomers describe it.

  11. #10
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    Default

    Hi sandy.
    I had the same problem looking at jupiter on friday too. Could see the 4 moons but hardly any detail on jupiter itself. I had been thinking that my scope needed collimating but after reading everyones comments it seems that it was atmospheric. How much detail could i expect to see in a 5" scope?

    Clear skies

 

 
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