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  1. #1
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    Default Need some help with eyepieces/barlow



    Hello, I'm backyard observing with my Celestron NexStar 5SE, and I have the Zhumell Eyepiece and filter eyepiece kit. I am observing with the eyepiece it came with, but when I put the barlow in before the eyepiece, I cannot see anything. I can also not use any of the eyepieces that came in the kit. Whenever i look through them, barlow or not, i see nothing through it. What is the order I put things in, (star diagonal, barlow, eypiece, filters) in my telescope 'socket'? A quick answer would be helpful. Thanks,

    Galactica
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    Barlows and a big set of eyepieces.

  2. #2
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    Default

    Quote Originally Posted by Galactica View Post
    Hello, I'm backyard observing with my Celestron NexStar 5SE, and I have the Zhumell Eyepiece and filter eyepiece kit. I am observing with the eyepiece it came with, but when I put the barlow in before the eyepiece, I cannot see anything. I can also not use any of the eyepieces that came in the kit. Whenever i look through them, barlow or not, i see nothing through it. What is the order I put things in, (star diagonal, barlow, eypiece, filters) in my telescope 'socket'? A quick answer would be helpful. Thanks,

    Galactica
    Yeah Diagnal, barlow, eyepeice, filter on back of eyepeice. Hmm There is no caps on any of the peices are there?
    Post a pic of what you have if you can......

  3. #3
    WWPierre's Avatar
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    Default

    Perhaps the target is just out of the view because the barlow makes your field of view half as big.
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  4. #4
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    Default

    If your getting results with just the ep in then your good. When you put in the barlow..drop in a lower power ep cause pierre (post above) is spot on.
    Declan.
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  5. #5
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    Try starting with your widest angle eyepiece first, without the Barlow in the mix. Get your target centered and focused in that eyepiece (EP), then you can move down to higher magnification.

    If you're not familiar with EP magnification, the higher the number, the lower the magnification, and the lower the number the higher. So if you have for example a 32mm EP, that is the one you would want to start with, not your 6mm EP. Once you have the target centered in the 32mm EP, then you can move to progressively higher magnifications, adjusting the centering each time until you can get it dialed in at the higher magnifications.

    Another thing to consider if you choose to use a Barlow, most Barlow's are 2x, which means they double the magnification of the eyepiece you are using. If you are using a 12mm EP, in conjunction with your Nexstar 5SE, which has a focal length of 1250mm, you are at 104x magnification. (Focal length divided by EP magnification gives you your total magnification). Your telescope has a highest effective magnification limit of 295x, with a realistic useful magnification limit probably more in the order of 230x. With a Barlow and a 12mm EP, you are sitting at 208x magnification, very near your useful magnification limit. Chances are at those magnification levels though a Barlow, you are going to find you actually lose detail and clarity. You would actually probably get much better detail and clarity from a 6mm EP and no Barlow, which would also put you at 208x magnification, but with fewer lenses between you and the light from the object.

    Try different combination's to see what gives you the best detail, but your best bet is to start with the lowest magnification, and work your way in to higher magnifications until you start losing clarity, then back up to the last EP where you still had good clarity.

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    Default

    Are you refocusing after using the barlow? It could be that the scope is just grossly out of focus...that can make the FOV look "empty". Try testing it out in the daytime and you will learn about how much refocusing is required with the barlow...they vary depending upon the make and style of the barlow (some require little to no refoucusing, others quite a bit).
    Craig

  7. #7
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    I'll try refocusing it, but as it seems when I think my object is out of view, I move the scope all around but I'm still not able to see any star at all. Thanks for the tips though, you guys.
    Celestron NexStar 5SE 4.92" f/10
    Barlows and a big set of eyepieces.

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    Don't give up!
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    I have a meade goto 90mm that only came with a 9 and 25, but I also have a celestron power seeker 50 and I can only use the 3x barlow in daylight with no diagonal or I see nothing at all, not quite sure why but seems the diagonal magnifies the image even more so I can only see like the difference from ground to sky no detail at all with my lowest 20mm ep. Is this just because it is poor low quality optics and small aperature issue?

 

 

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