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    Default Next eyepieces



    I am planing on saving up for some more eyepiece (s). Based on what I have already what should I be heading towards next? I am hoping for some ideas so that I know how much I should be putting aside for them so that, I can pick them up down the road. Should I be looking at smaller mm sizes?

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    Default Re: Next eyepieces

    I would suggest a 12mm which could also then be barlowed down to a 6mm which would be a good planetary focal length.
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    Default Re: Next eyepieces

    Yeah, I agree with Gabby, I would be looking at a 12mm EP. Maybe a 20mm down the road to fill a little gap you have.

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    Default Re: Next eyepieces

    I agree with Gabby. ~12mm EP will deliver ~100x and ~2mm exit pupil - great for hunting galaxies and other small to mid range DSOs.

    I would recommend Explorer Scientific 82 degree 11mm or Celestron X-Cel LX 60 degree 12mm.

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    Default Re: Next eyepieces

    Thanks, now I have an idea what to save up for.
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    Default Re: Next eyepieces

    You have: 30 25 15 mm's
    barlowed: 15 12.5 7.5 mm's

    You should get a 6mm next. For planets you don't really want to use a barlow. The extra 2 lenses is gonna degrade the view slightly vs. a 6mm with no barlow. You have the low and medium powers covered already so go for higher powers you need for planets 4, 5 and 6mm's. Start with the 6 and work your way down, your atmospheric conditions is what limits your maximum magnifications.

    Them guys back east usa can rarely go above 200x, a 6mm will not be too much to start with.
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    Default Re: Next eyepieces

    Quote Originally Posted by tomjones View Post
    You have: 30 25 15 mm's
    barlowed: 15 12.5 7.5 mm's

    You should get a 6mm next. For planets you don't really want to use a barlow. The extra 2 lenses is gonna degrade the view slightly vs. a 6mm with no barlow. You have the low and medium powers covered already so go for higher powers you need for planets 4, 5 and 6mm's. Start with the 6 and work your way down, your atmospheric conditions is what limits your maximum magnifications.

    Them guys back east usa can rarely go above 200x, a 6mm will not be too much to start with.
    Yes 6mm (~200x, 1mm exit pupil) is what I would also advise for planets. How you get there is a matter of preference. Cheap barlow will definitely degrade image. However, good quality barlow can actually polish the view a bit. In my hands 11mm EPs barlowed with TeleVue 2x produce similar quality views of planets as 5.5 and 6mm EPs when the seeing is good. When viewing conditions are not as good using 11mm EP + 2x barlow combo often produces steadier image than 6mm EP alone, because 2x barlow doubles F ratio of your scope. I even use 18-20mm EPs with 3x TV barlow to push F ratio even more.
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    Default Re: Next eyepieces

    When viewing conditions are not as good using 11mm EP + 2x barlow combo often produces steadier image than 6mm EP alone, because 2x barlow doubles F ratio of your scope. I even use 18-20mm EPs with 3x TV barlow to push F ratio even more.
    I'm not sure why a barlow would make the image steadier. Can you explain that?
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    Default Re: Next eyepieces

    I'm not exactly sure of the how or why, but this has been my experience as well. I've never been real happy with the views from the 5mm or 4mm EPs I've had before (now they are gone), but have had good results when Barlowing the 11mm, 10mm, 9mm, and 8.8mm EPs I have. It hasn't been a quality issue as the very short EPs were premium EPs. I guess it has come down to the eye of the beholder. It is for this reason the only ES 82 I lack is the 4.7mm.
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    Default Re: Next eyepieces

    Quote Originally Posted by Purdyd View Post
    I'm not sure why a barlow would make the image steadier. Can you explain that?
    I mean visual image, I can't say anything about AP. Barlow increases F ratio of your scope, so F5 scopes becomes F10 with 2x barlow. When air cells pass in front of the planet, planetary image "floats" in and out of focus. Slower scope (with higher F ratio) will retain focus better because it produces long elongated cone of light, while faster scope produces short and squat cone of light.
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