[MF3D.FORUM:604] Re: as reguards to using 43mm or 80mmlenses

["Oleg Vorobyoff" <olegv@xxxxxxxxxxxxx>]

Don Lopp wrote:

>I don't remember whether or not you mentioned how close the nearest
>thing was in your photos was, but with a 6 inch base for the 43mm
>should be about 20 feet and about 36 feet for the 80 mm lenses more

>or less depending on how the verticles are arranged.

Don, what calculation method are you using?  I get much smaller distances: about
8 feet for the 43mm lens and 15 feet for the 80mm lens.  Example for the 43mm
lens, using John B's formula:

Base = 0.0025*(100*2.57/(100-2.57))*(1/.043-1/6) = 0.152m or 6 inches

In the above I adjusted near point by trial and error until I got the 0.152m
base we sought.  Near point came out 2.57m or 8.43 feet.  Other assumptions made
in the calculation were:
  On film deviation: 0.0025m
  Far point: 100m
  Focus point: 6m

Oleg Vorobyoff