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    DUCE202's Avatar
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    Question Best focal lenght eyepiece for observing saturn or jupiter



    Hi guys, just got a good used etx 125 pe. I`m looking for the best eyepiece or focal length i can use for saturn or jupiter. Many people have said they can use a 2x barlow with a 15mm for 253x and have no problem..something tells me this is stretching it 40x or 50x..with no loss of detail? I was thinking of a tmb planetary,orien edge on or even a astro tec par. Probably 7mm-9mm.. Not sure..also i need some one to tell me, it is not better to barlow an 18mm rather than just use a good 9mm that would have less lenses then 2-3 in a barlow plus another 4-5 in the eyepiece? The eyepieces i mentioned all have good eye relief.. Ok all you etx 125 people please advise..thanks........

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    Default

    I'm no expert but I know I can push the power n the planets if conditions are OK.
    While the barlow does add more glass, for me I don't see much degrading when viewing the planets.
    Clear Skies

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    BigJack

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    Default

    Hi there DUCE,

    I might not be qualified, as I don't own that scope or have any experience with those EP's, BUT, I figured I'd toss in a small bit of my own personal experience, in the hopes that maybe it will help you a little?

    I always try to get the best views I can, without the use of a barlow....but, that's just me. I have a barlow, I just (RARELY) ever use it. I find that using the barlow is sometimes overkill, and not necessary. Not to mention, too much magnification for my liking. One heavy breath near the telescope, or the slightest "nudge" on the scope, and the object in view is constantly shaking all over the place! For me, that's really annoying.

    I try to keep my high-powered planetary viewing to maybe using my 12.5mm EP...or MAYBE my 10mm, or 9mm EP...For me, that's as high as I'll usually push my scope for most objects....

    Now, I happen to own an Orion Edge-On 3mm.....This EP has WAY too much power for the likes of me. I bought it on a whim, and thought "maybe" it would be a great EP for planetary viewing....and it might be.... just wasn't my cup of tea.

    Of course, all this is purely a personal preference. You might find that using a barlow works well for you? Everyone's eyes are different, our scopes are different, etc etc... and everyone seems to have their own favorite "goto" EP's in their gear bag.

    Also, it's a lot of time behind the scope, as well as trial & error. And, just seeing what works best for you, and your scope. I think, with some good quality observing time, you'll learn the limits of what your scope can actually handle, and just how far you can push it, while getting the best possible views.
    Chris
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