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[photo-3d] Centerline Definition

  • From: siggyblue@xxxxxxxxx
  • Subject: [photo-3d] Centerline Definition
  • Date: Fri, 12 Jan 2001 03:40:32 -0000

Alan Lewis in taking about Holmes viewer focal lengths says:
"Note that when you focus your eyes through any scope that the 
distance from
the card to the lens will be less (by 1 to 2") than the actual focal 
length of the lens, and that this focus distance will change 
slightly relative to the centerline distance of the views." 
Could someone define "centerline" for me?
Thanks 
David