Jim Lafferty
April 2nd, 2006, 10:24 AM
How are the two numbers related? The Century Optics +7.0 achromat is what equivelant FL?
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View Full Version : Century Optics Achro Powers and Focal Length? Jim Lafferty April 2nd, 2006, 10:24 AM How are the two numbers related? The Century Optics +7.0 achromat is what equivelant FL? Jim Lafferty April 5th, 2006, 12:10 AM So I called CO today and asked them this exact question and got a funny response: we can't tell you that information because then you could make an achromat that works just as well as ours. My only thought was: Exactly! Quyen Le April 5th, 2006, 01:23 AM approx 143mm fl, thanks. Quyen Jim Lafferty April 5th, 2006, 01:36 PM So how does that relate to the GG position, then? Mine is about 55mm away from the Achromat, and focuses fine. What does FL describe, if not the distance of the subject to the lens? |