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[MF3D.FORUM:516] Re: Exact fl match for paired lenses.

  • From: Paul Talbot <ptww@xxxxxxxxx>
  • Subject: [MF3D.FORUM:516] Re: Exact fl match for paired lenses.
  • Date: Fri, 19 May 2000 22:12:29 -0500
Bill Glickman wrote:
> 
> As per my last post regarding the grid test, the only information I
> possibly left out was the distance in which the camera was from the
> target... the camera was approx. 4.5 feet form the grid target.

I don't think the distance from the target is significant,
but the size (on film) of the grid is.  If your grid was
55mm on film and the size difference was .15mm, I would
interpret that as about 0.27% difference (.15/.55*100).
But I've never done this test before, so that's just a
guess.  :-)

I noticed in some old list messages today that John B. and
Greg E. have also discussed the necessity of comparing the
distortion effects of the lenses, in addition to the focal
lengths.  For example, do the pincushion/barrel distortions,
if any, appear to be about the same?

Paul Talbot