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    Default Eyepieces/Barlow for Celestron 130 SLT



    Hi All, would be very grateful for your kind advice/comments on the choice of eyepieces for my new scope.

    I have recently purchased the Celestron 130 SLT scope (130mm/2.5 inches, 650 focal length). Eyepieces that came with the scope - 25 mm (25x) and 9 mm (72x).

    I am contemplating getting Celestron Omni 4 mm eyepiece or Synta SWA 4mm eyepiece (Synta looks like a better option of these two, right?). And I also want to get the 2X Barlow - Celestron Omni. Primary purpose - viewing the planets and the Moon, as well as nebulae.

    These eyepieces would provide magnifications of 162 and 324 (w/o and with the Barlow).

    Would you recommend some eyeieces instead of the ones I mentioned or maybe some in addition to the ones I mentioned?

    Magnification of 324 is slightly higher than the maximum useful magnification of the scope (which is 307, according to Celestron website) - would this cause me some problems?

    Many thanx for your kind help, Alex

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    Default

    It comes with the standard 1-1/4 inch focuser right? Personally, I wouldnt do the 4mm lens. The reason being, it will really only be useful in nights of INCREDIBLE seeing. Not great, INCREDIBLE.

    Take a look at the Zhumell Planetary Z lenses. If it were me, I would start out with the 14.5mm Z and a good Barlow such as the GSO barlows. That gives you a good arsenal of starter lenses along with 1 good quality lens with a good field of view and comfortable eye relief, and a barlow that effectively turns your 3 lenses into 6. Later you will probably want a higher quality lower power eyepiece in the 32mm range to complement your set, and you wont break your bankroll doing so.
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    Default

    Hi, thanx for your helpful advice!

    Just to check on the magnification though - if I do not buy a higher power eyepiece, the maximum magnification I will achieve will be 144 (650/4.5, with 4.5 being 9mm eyepiece with 2X Barlow). I appreciate that 300 magnification may be too much, but would not 144 be too little? Esp for viewing Jupiter (since you do want to have a good look at this planet these days ). Regarding observiceg conditions - I occasionally have a chance to observe in a village where there are no direct sources of light, but where the halo of light from a nearby town is still noticeable.

    GSO Barlow - don't see it on offer here in Ukraine, but the Celestron Omni Barlow seems to be more expensive, while offering superior/equal qualities (I'm not that experienced in Barlows, though). Are there any special reasons in favor of the GSO one, or would Celestron do fine as well? Have never owned a Barlow, so just want to make sure that I understand all issues involved.

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    Default

    Hi Alex, welcome to the forum!
    The Omni 4mm eyepiece (EP) is the same as the one that comes from the Celestron kit, which I had, and would not recommend it, the eye relief (ER) is too tight for comfort - you have to put the eye very close to the lens that you will tire of using it easily and probably would just set it aside after using it once or twice - I still have my 4mm but I don't use it.
    The barlow is a better idea, use it on your 9mm to get a rough equivalent of the 4mm EP. The 9mm that you now have is a good EP, I've read from a review, so use that now as you gain more log time using your scope. I have the Omni 2x barlow and the quality is just so-so, useable but not the best, although its cost is low and that makes it attractive. One thing that's good about it is that you can unscrew the bottom lens (black part) and screw it on the filter thread of your 9mm and it will give you a 1.5x equivalent, so it serves double purpose of 1.5x and 2x when used as a whole piece. If you want a good barlow, the Celestron Ultima 2x has a very good reputation for quality, although it costs more than the Omni barlow. If you want the best, the Televue 2x barlow is very good, it's my favorite to use but costs more at around a hundred $'s. You have to decide on balancing cost vs. performance which is the same thing you do when choosing other EP's. Other options are the GSO plossls, or the Sterling plossls or as mentioned above the Zhumell Z planetaries. But for now, just get a barlow and test it with your existing 9 and 25mm's. In the future, you might want to get widefield EP's which will show more than the plossls but if you're ok with the size of the view that you have now then it's just fine. Just post if you have more questions, the good folks here are always eager to help. Clear skies!

    Best,

    Hernando

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