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Orthoscopic eyepiece question
I was browsing around the WWW tonight and encountered the University Optics
site and their Orthoscopic eyepieces. So, what's an Orthoscopic eyepiece versus Plossl, Radian, Nagler, etc. Ooooohhhhh nooooo -- I just asked the wrong question - - - here goes the Great Eyepiece Debate again. Forgive me for I am a novice and I have sinned. -- ---- Joe S. |
#2
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Orthoscopic eyepiece question
Joe S. wrote:
So, what's an Orthoscopic eyepiece versus Plossl, Radian, Nagler, etc See: http://www.astronomydaily.com/atm/ep.asp (you may need to register) For specific eyepiece specs, see: http://www.klhess.com/telespec.htm Best, Stephen -- + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + Stephen Tonkin | ATM Resources; Astro-Tutorials; Astro Books + + (N51.162 E0.995) | http://www.astunit.com + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + |
#3
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Orthoscopic eyepiece question
On Wed, 23 Jul 2003 21:34:00 -0400, "Joe S."
wrote: I was browsing around the WWW tonight and encountered the University Optics site and their Orthoscopic eyepieces. So, what's an Orthoscopic eyepiece versus Plossl, Radian, Nagler, etc. Ooooohhhhh nooooo -- I just asked the wrong question - - - here goes the Great Eyepiece Debate again. Forgive me for I am a novice and I have sinned. Performance on planets, the Moon. Also, generally neutral colouration of those objects relative to some other eyepieces, and affordable, even in expensive brands like Taks. When you realize ultra wide field eyepieces serve well for wide field objects, you buy another eyepiece for ultimate contrast, FOV not being that important. But, having said that, the new TMB Monocentrics might be worth comparing, even if they cost nearly as much as Radians. -Rich |
#4
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Orthoscopic eyepiece question
(If you are lucky), you get what you pay for...
"Joe S." wrote in message I was browsing around the WWW tonight and encountered the University Optics site and their Orthoscopic eyepieces. So, what's an Orthoscopic eyepiece versus Plossl, Radian, Nagler, etc. Joe S. |
#5
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Orthoscopic eyepiece question
(If you are lucky), you get what you pay for...
Always. But knowing what we're paying for is another matter. UO orthos I have used are sharp, affordable, lightweight. The field of view is _not_ wide field at all. The eye relief is close, in mm, to the focal length. So the short focal length ones have tight eye relief. Therefore you are not paying for a wide field, nor a standardized 20mm eye relief. Just a sharp image. john |
#6
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Orthoscopic eyepiece question
"Joe S." wrote in message ...
I was browsing around the WWW tonight and encountered the University Optics site and their Orthoscopic eyepieces. So, what's an Orthoscopic eyepiece versus Plossl, Radian, Nagler, etc. Ooooohhhhh nooooo -- I just asked the wrong question - - - here goes the Great Eyepiece Debate again. Forgive me for I am a novice and I have sinned. For image sharpness and contrast Orthos virtually can't be beat. On the other hand, they have the smallest field of view (even smaller than Plossls) and short eye-relief at high powers. Radians, Naglers and the like aim towards similar image quality but with superior eye-relief and a generous field-of-view. If you are on a budget, and are mostly into planetary viewing Orthos should be sufficient. Some may want a larger fov for lunar observing though. |
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Orthoscopic eyepiece question
wrote in message
... But, having said that, the new TMB Monocentrics might be worth comparing, even if they cost nearly as much as Radians. -Rich Has anyone had a look through the TMBs yet? Brian A |
#8
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Orthoscopic eyepiece question
On
the other hand, they have the smallest field of view (even smaller than Plossls) and short eye-relief at high powers. However, they have slightly longer eye relief than Plossls. Typically, an Ortho would be used for lunar or planetary observing, and in many cases a wide field would be a distraction. Clear, Dark, Steady Skies! (And considerate neighbors!!!) |
#9
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Orthoscopic eyepiece question
Even if you decide that wide field EPs are for you (alt/az mount, strong
interest in DSO’s etc.) Buy one Ortho that will give you about 150x with your scope. It will be a useful frame of reference, for evaluating other EPs as well as atmospheric conditions. All the best, Dave Werner |
#10
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Orthoscopic eyepiece question
I have a suspicion most eyepieces are pretty darn
comparable on-axis, but I certainly do not know that for sure. For long focal lengths, you are very right. As the focal length gets shorter, for instance in Dobs, then certain eyepieces will add small amounts of spherical aberration. Off-axis, that is another whole ball of wax. Roland Christen |
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