Thread: How to figure prime focus
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Old 15-02-2008, 09:45 AM
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Kirkus (Kirk)
Beginner-ish

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Join Date: Dec 2007
Location: California, USA
Posts: 207
So, going to focal length, just to be sure, if my focal length is 1270 and I'm using a 2x barlow, my focal length is increased to 2540, right? And a 3x barlow would increase it x3, or 3810.
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