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Re: Matching lenses - distortion

  • From: erker@xxxxxxxxxxxxxx (Greg Erker)
  • Subject: Re: Matching lenses - distortion
  • Date: Thu, 20 Aug 1998 13:57:15 -0600
>I drew and have just started using 4 concentric circles
>(yes, of different diameters 8-) for a test chart.  This
>should give me focal length match and distortion in one
>swell foop.  I'll let y'all know how it comes out.
>
>John B

  How is a circle better than my 8 dot square
idea?

  Don't you reduce your measurement accuracy
by missing the corners, or do you use a cropped
circle for the largest one?

Greg