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measuring the focal length of a lens

  • From: Jook Leung <jook@xxxxxxxx>
  • Subject: measuring the focal length of a lens
  • Date: Thu, 29 Apr 1999 14:47:00 -0400
That is good to know that Nikon markings are reliable.

How do you measure the focal length of a lens?
Is there any way for the layperson to do it without an optical bench?

Thanks,
Jook

>46.5mm is the correct flange focal distance for Nikon Lenses.  Make sure
>that in your mounting that the lens mount is parallel to the focal plane.
>We use tolerances of +.0000" -.0005" for our systems, and require
>parallelism to be within .0002".
>
>I have measured focal length on a great many Nikon Lenses and find that
>the focal length marked is usually pretty accurate.
>
>Dan Irvin
>Century Optics.
>dirvin@xxxxxxxxxxxxxxxxx
>
>----------


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Jook Leung    jook@xxxxxxxxx    http://360vr.com    201.894.5881
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