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cosmoskid
scholastic sledgehammer
Reged: 11/15/08
Posts: 806
Loc: Indiana USA
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Has anyone had any experience with these? Would this eyepiece be to much power for my XT10>
Thanks for your help
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"Educate and inform the whole mass of the people... They are the only sure reliance for the preservation of our liberty." Thomas Jefferson.
"Who are they to judge the life I live? Before you start pointing fingers, make sure your hands are clean.”
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Cliff Hipsher
sage
Reged: 12/31/08
Posts: 260
Loc: Claremont North Carolina
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Just divide the scopes focal length by the EP's 5mm FL. This will give you the magnification power. Bounce that against the manufacturer's listed maximum magnification.
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Cliff Hipsher
ICC USN (Ret.)
'03 883 XLH
Meade LX5 2080 (Big Blue)
Galileo G-102MD2
I.A.M.B.K.
I ride. There fore I am...
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Ricky B.
sage
Reged: 05/20/06
Posts: 327
Loc: Salem, OR USA
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Depends on your skies. It's a rare night when I've been able to get a clean view with anything stronger than 9mm with my 8-inch Zhumell dob. It's likely you won't use it enough to justify it.
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Zhumell 8" dob
Telrad w/dewshield plus
38mm Q70 clone
2" 30mm Russell WA Hybrid
2" 26mm Eclipse Q70 clone
13 & 8mm Baad Hyp
6mm Burgess Planetary
2" GSO ED Barlow
An abundance of clouds
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Luigi
Postmaster
Reged: 07/03/07
Posts: 5272
Loc: MA
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150 to 200x is about the limit most of time so at 240x it will be a bit too high for general use, but for $50 and free shipping at telescopes.com, it's a great deal and something to have in your arsenal for that rare steady night of planetary or lunar observing.
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17.5" f/5 Dob. IM-715 MCT. 120ED. Lunt 60mm Ha.
Zeiss, Leica, Fujinon, Nikon, Pentax, Bushnell bins
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panhard
Mongo
Reged: 01/20/08
Posts: 5378
Loc: Markham Ontario Canada
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There are some nights When my 8 mm ep used as a 6mm is really shaky.
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David E
Post Laureate
Reged: 05/25/06
Posts: 3240
Loc: North Carolina
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I actually use 240x in my 8" Dob quite often, and there's no reason it can't be used often in a 10" Dob. But the air is usually too unsteady for lunar/planetary work at this power. However, even a mildly unsteady sky will give you great high power views of brighter deep space objects like globulars, small open cluster, and planetary nebulae. My issue with any 5mm plossl is the tiny eye relief and tight field of view. This might make it hard to get and keep a target in the field of view with a muscle drive mount. My Vixen 5mm NLV works better because of the great eye relief and ample field of view, keeping a target in the field for more than 30 seconds as it drifts from edge to edge. The price IMHO is worth the image quality (albeit with a smaller true field of view over the much pricier Naglers and Pentaxes.) If you want to stay in the $50-100 bracket, check out the 5mm TMB Planetaries sold at Astronomics, or the SmartAstronomy 5mm Solar System eyepiece.
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David E
"If there was life on other planets, we would have sent them some foreign aid by now." -commedian James Gregory
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