Does anybody know where I might find a pair of "shorty" 1.5X barlows to use on a binoviewer? Thanks .....Gary
Where can I find a shorty 1.5X Barlow?
Started by Gary Palmer, 06/12/2002 12:56PM
Posted 06/12/2002 12:56PM
Opening Post
Posted 06/12/2002 05:15PM
#1
Gary,
The Uranoport Barlows are the only ones I know about. Find Uranoport on the Astromart homepage. Haven't tried one.
I've heard that it is better for optical and mechanical reasons to Barlow a binoviewer up-front than use short focal length eyepieces (or equivalent using Barlows) on the back end. At first glance it might seem equivalent, but in fact one setup is more sensitive both to prism defects and collimation errors than the other. Of course it's hard to get 1.5x by Barlowing up front--would have to be a very weak Barlow lens.
--
Mike
The Uranoport Barlows are the only ones I know about. Find Uranoport on the Astromart homepage. Haven't tried one.
I've heard that it is better for optical and mechanical reasons to Barlow a binoviewer up-front than use short focal length eyepieces (or equivalent using Barlows) on the back end. At first glance it might seem equivalent, but in fact one setup is more sensitive both to prism defects and collimation errors than the other. Of course it's hard to get 1.5x by Barlowing up front--would have to be a very weak Barlow lens.
--
Mike
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