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  1. #1
    barnstorm's Avatar
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    Question Explore Scientific 8.8mm 82 deg or 9mm 100 Degree for 16" f4.5 Dob?



    Explore Scientific 8.8mm 82 deg or 9mm 100 Degree for 16" f4.5 Dob?

    Looking to buy a high power eyepiece for my Dob.

    Currently using :

    Explore Scientific 30mm

    Speers Waler 12mm


    Should I hold out for 100 degrees?

    Will my coma just bugger the 100 up anyway?

    Are there other EP's I should consider?


    Thanks!

  2. #2
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    FWIW I have looked through the more expensive one's on the market via a star party and they were very impressive but for my budget the 82*'s, including the 8.8, were just right. Even with the 8.8 I still feel like I am swimming in space and the price was too good to pass up. I would think the 100's would be nice but not really worth the extra dosh unless you really really wanted that 100* view...
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  4. #3
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    Quote Originally Posted by cbrucker View Post
    FWIW I have looked through the more expensive one's on the market via a star party and they were very impressive but for my budget the 82*'s, including the 8.8, were just right. Even with the 8.8 I still feel like I am swimming in space and the price was too good to pass up. I would think the 100's would be nice but not really worth the extra dosh unless you really really wanted that 100* view...
    Thank you!

    Would a 4.7 or 6.7mm even be usefull in a 16" f4.5 Dob?

    I was thinking the 100d would keep things in view long enough to get a look.

    Since ES's are so popular right now, I suppose I could always sell it used when I am ready to go 100D.

    .

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    You would need to have VERY good viewing conditions with anything under 8.8mm. Even with the 8.8 you can drive yourself to distraction trying to get focus. I just take a Zen approach to it when I run into that problem and enjoy the view after getting it as close to clear as I can verses sending myself round the twist messing about with fine focusing.
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  7. #5
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    Never looked through the 100s but the 82 gives you alot of sky and is alot cheaper.

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  8. #6
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    I've looked through an ES100 in an f/5 12" dob and the view was surreal. Definitely better than my ES82s.

    I, myself, am holding out for an ES100 9mm for my 10" f/4.7 scope, as that is the sweet spot for DSO hunting (~2mm exit pupil). So I figure if that's where I'm going to do the most hunting, I might as well pull in the biggest chunk of sky that I can while doing it.

    The ES100 is also a clone (see the x-ray) of the Ethos, so it has (I believe) better spherical correction than ES82/Nagler.

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  10. #7
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    Quote Originally Posted by barnstorm View Post
    Thank you!

    Would a 4.7 or 6.7mm even be usefull in a 16" f4.5 Dob?
    The 4.7 would be overkill on most nights, but the 6.7mm would probably be useful for planetary observation on average nights, as the magnification would still be under 300x. I routinely use 240x on planets in my 10" scope and usually get great views.

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  12. #8
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    I'm not the smartest kid on the block... and I do not use a Dob where I have to nudge the scope along to keep an object in the FOV...

    BUT

    I see a great value in ultra wide FOV low powered eyepieces for DSO's etc

    HOWEVER I see no NEED and have no desire for a ultra wide angle view of all the surrounding sky around a planets or the moon....can't figure out why anyone would want one for planetary or lunar observing UNLESS they had trouble keeping the object in the FOV by manually moving the scope...Personally I never had much of a problem when I owned a dob...even under high power..

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  13. #9
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    Quote Originally Posted by Bob327 View Post
    I'm not the smartest kid on the block... and I do not use a Dob where I have to nudge the scope along to keep an object in the FOV...

    BUT

    I see a great value in ultra wide FOV low powered eyepieces for DSO's etc

    HOWEVER I see no NEED and have no desire for a ultra wide angle view of all the surrounding sky around a planets or the moon....can't figure out why anyone would want one for planetary or lunar observing UNLESS they had trouble keeping the object in the FOV by manually moving the scope...Personally I never had much of a problem when I owned a dob...even under high power..

    BobG.
    I agree -- I tend to use my 5mm orthoscopic eyepiece for planetary observation (when conditions allow). With my eye a comfortable distance from the eyepiece I only get about a 20 degree AFOV. But since my scope tracks, that's not a big deal. I have a feeling it would be a huge pain in the rear trying to nudge a dob in increments of a few arcminutes at a time, just to keep a planet in the field.

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    Go with the 100 if you've got the cash. Especially if the 100 gives better results than the 82 (which is great).If you've got tracking (which I dont) having some room around the planet might be considered a waste. But I wouldnt want to try to keep a planet manually centered in my scope with a 20 to 40 degree FOV. I like for my sessions to be relaxing. I had a good time viewing Saturn the other night with my 5.5 Plossl with 60 degree FOV. But even with 60 degrees FOV, at that magnification if you turn your head your target is gone. That EP is probably about as low as I can go and still enjoy things. So, if you have a manual scope that extra sky is not a waste but a blessing. Having said that, if I had a tracking scope I would definitely have a couple of Orthroscopics for planetary use.

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