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  1. #11
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    Depends what skies are like where you are as to how powerful you can go. I have seen posts on US boards where popel run to huge powers. Here in the UK sky conditions rarely permit much over 250.

    I have a Mak with a longer focal length of 2700mm (actually its longer as it has a rear focuser which has the effect of increasing focal length slightly). For me with that scope 9mm is the most I could ever use which would give me x300 but as Joe says I doubnt sky condtions will be good enough to use that kind of power more than once or twice a year. Mostly I plan to use a 13mm to give me around x200.

    With your fcal length of 2350 and a 200mm aperture I'd sugget 9mm is probably the max unless your skies are super clear.

    I have a Burgess manufactured TMB Planetary II in 6mm and a clone in 9mm which looks identical. Theres little difference in performance if any. Sometimes I think the 9mm works a bit better but thats down to sky conditions I suspect rather than any fault in the 6mm.

    I also have some UO Orthos to test out if the clouds ever go away.
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    BABOafrica (09-07-2011),j.gardavsky (09-06-2011),jimt (09-07-2011),Joe Lalumia (09-06-2011)

  3. #12
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    Quote Originally Posted by Astro-Baby View Post
    Depends what skies are like where you are as to how powerful you can go. I have seen posts on US boards where people run to huge powers. Here in the UK sky conditions rarely permit much over 250.

    ...

    With your fcal length of 2350 and a 200mm aperture I'd sugget 9mm is probably the max unless your skies are super clear.

    ...

    I also have some UO Orthos to test out if the clouds ever go away.
    Good luck on your clouds.

    We do gets LOTS of really clear and mostly steady skies during the dry season. Night after night of it. Perhaps I can use higher power after all. I did use a friend's 4mm once and it worked well in my scope.

    Also, just wanted to clarify one thing. You said that my focal length is 2350mm with a 200mm aperture (and concluded: I'd sugget 9mm is probably the max unless your skies are super clear.)

    I think the focal length on my scope is exactly 44 inches. I measured it myself. Now, maybe I did it wrong. But I doubt it, since my scope (which I built myself) wouldn't work if I got that wrong. At least I don't think it would. So that would make my focal length 44" = 1118mm, right?

    Since the aperture is 10", that comes to 254mm (actually it's 260 to be more accurate).

    Then again, there's a lot I don't know and maybe I'm missing something here.

    Please clarify for me.

    Cleers,
    Joe
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  4. #13
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    Ahh think we crossed posts - I was talking to the other poster who had the SCT scope - sorrt bout that
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  5. #14
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    Apology from me as well, I think I may have accidentally hijacked your thread.

    Jim
    Celestron C9.25. Atlas EQG mount. Canon 500D unmodded, Celestron ST80 guide scope, SSAG, Meade 6.3 FR, Thousand Oaks dew control with Dewnot straps. Zhumell 8/24mm Zoom, 2"Gso Superview 42mm, Meade 2"QX wide angle 30MM, Meade 1.25 EP and filter set. Tasco 10x50 Zhumell 20x80 bino and a few other odds and ends.
    Now where did I put that clear sky button!

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  6. #15
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    Joe, I have a Zhumell 8-24m zoom. I find that my target has to be VERY bright for the high magnification to be rewarding to look at. do you feel your planetary EPs will give a brighter image? or sharper.....the shorter the F/L on my zoom, the less rewarding the sharpness of the image is. in other words, the 8-9mm range of the zoom is really not worth using. But, maybe an EP designed for only one short F/L would give more rewarding views. bottom line....in your opinion, will the planetary EP be bumping into the law of diminishing returns or is it really a terrific step up to planetary viewing?

    I've wasted a lot more than the $60.00 buy in trying to improve my viewing experience, so dont feel responsible for any expenditures I might make.
    thx.
    Jack
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  7. #16
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    Yes------ personally I do not like Zoom eyepieces. They do save a beginner some money-- and they are useful at public observing events-- but generally regular quality eyepieces have sharper images and can be purchased with better eye relief-- and fields of view-- albeit a little more money spent.

    The TMB planetary has fewer elements, like an Orthoscopic eyepiece -- on purpose-- which can lead to slightly brighter images with more contrast-- they are optimized for high magnification viewing.

    Anytime you increase the magnification you will dim the image-- that's why we advise people to use HIGH magnification on the moon if they do not have a moon filter-- to dim the moon.

    Good article about planetary eyepieces:
    Shallow-Sky list Planetary Eyepiece FAQ
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  9. #17
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    Great Deals! Always when I'm short on bucks! Awe, poor me!
    Lee

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  10. #18
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    I got the 4mm EP...i finally was able to use it this weekend on the Moon and Jupiter. I was really impressed. The views were great. I am a big fan of these EP's...
    Steve

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  11. #19
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    Thanks for the confidence builder, Joe. I just ordered the 9mm. should I not have ordered it today with new moon arriving about the time the new EP will arrive. I'm planning a trip out of town to a star party on the 23rd??

    Hope someone gets their big scope this week so the clouds will clear by 9/23
    Jack
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