DV Info Net - Century Optics Achro Powers and Focal Length?

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Jim Lafferty

April 2nd, 2006 10:24 AM

Century Optics Achro Powers and Focal Length?

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?

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