Re: PHOTO-3D digest 1296

[P3D Bob Howard <bobh@xxxxxxxxxxxxxxxxxxxx>]

RE: MTF Curves
An anology to this mechanized method of testing (lens test charts were 
subject to eyeball analysis via a microscope and the judgement if 
something was resolved really..with things like false resolution where 
lines show up again after resolution seem to have been reached) is 
perhaps the use of square waves and an oscillosope to test a hifi 
amplifer. The degree of rounding to a sine wave was the faiure to pass 
the test. By the design of the contrast and line spacing of the MTF 
target on gets a similar output showing "roll off". Since perfect amps 
and lenses don't exist hardly ever does one get the square wave 
reproduced. BobH
(While makers hate to publish MTF or resoltion because it doesn't tell 
all about a lens quality..the British Weekly Amateur Photographer used 
to publish MTF curves as did Photography when they tested cameras. These 
courtesey of a London camera shop that had bought a machine. BobH)
The inability to tell much from these curves about the lens is the 
reason they Popular Photography has the color coded scheme which 
includes observer critiques of prints as well as other test data. This I 
think devised by retired Kodak Optical engineer. BobH


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End of PHOTO-3D Digest 1297
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Date: Thu, 25 Apr 1996 13:40:38 -0500
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			    PHOTO-3D Digest 1297

Topics covered in this issue include:

  1) Virtual Boy found
	by P3D Elliott Swanson  <elliott@xxxxxxxxxxxxxxxxxxxx>
  2) scanning, digital
	by P3D Lew Clayman/K Szafran  <kandlew@xxxxxxxxx>
  3) Re: Realist vs. 4"x5"
	by P3D John Bercovitz <bercov@xxxxxxxxxx>
  4) Wollensak f/stop
	by P3D John Bercovitz <bercov@xxxxxxxxxx>
  5) F.J. Haynes
	by P3D Gary Nored <gnored@xxxxxxx>
  6) View Master Mounting
	by P3D  <mzohn@xxxxxxxxxxxxx>
  7) Virtual Boy
	by P3D Bruce Rosenberger  <BR3D@xxxxxxx>
  8) Re: Virtual Boy
	by P3D Marvin Jones  <72657.3276@xxxxxxxxxxxxxx>
  9) Re: "00:00"
	by P3D Wolfie!  <werewolf@xxxxxxxxxxxxxxxxxxxxx>
 10) Quaint old equipment
	by P3D Gavin Stokes  <gstokes@xxxxxxx>
 11) NSA Texas show directions
	by P3D  <LDAEnt@xxxxxxx>
 12) RE: Virtual Boy
	by P3D Peter Eggleston <peter@xxxxxxx>
 13) MTF
	by P3D  <LeRoyDDD@xxxxxxx>
 14) VCR clocks
	by P3D Michael Dabrosca <zephyr@xxxxxxxxx>
 15) 3D for the masses
	by P3D Michael Dabrosca <zephyr@xxxxxxxxx>
 16) Re: Columbia's 3-D movies
	by P3D Derek Gee  <73157.2172@xxxxxxxxxxxxxx>
 17) Re: PHOTO-3D digest 1296
	by P3D Bob Howard  <bobh@xxxxxxxxxxxxxxxxxxxx>
 18) Re: PHOTO-3D digest 1296
	by P3D Bob Howard  <bobh@xxxxxxxxxxxxxxxxxxxx>

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