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Steven Aggas
sage
Reged: 04/15/08
Posts: 289
Loc: Arizona
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Eyepiece v. Eyepiece/Barlow and PN cs's
07/08/08 06:28 PM
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Several of my friends have commented at different times that at a similar magnification an eyepiece and barlow combo will show some Planetary's central stars much more clearly than an eyepiece by itself. I've seen this myself too a couple of years back, switching back and forth enough to say it was not atmospheric.
What makes this apparently work, does the barlow, by making an effectively longer FL system, reduce coma and therefore produce tighter star images, or what? Have others seen this?
Steven
--------------------
Mr. Wizard
Elements in Harmony I, an 8"f6 German Equatorial - Stellafane Winner,
II a 20"f4.2 Newt-Dob - Astrofest Winner,
III a 6"f3.5 Finder/Newt-Dob, and
IV a 36"f4.5 Newt-Dob - "If it's up there, it's in here."
www.DarkSkyObserving.com
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