Re: Allan Carrano comment on color slide film (digest 1514)

[P3D Bob Howard <bobh@xxxxxxxxxxxxxxxxxxxx>]

RE: Allen bemoans the loss of 'true color slide film' versus the current
crop of poster colors and "snap". These film as not suited very well to
viewing in a viewer. Projection is less critical about like small
prints. Modern contrast lenses are not the end all either if they have
no resolving power and fall apart on blowups. About 25 years ago Zeiss
decided it was folly to design beyond 40 lpm in 35mm as most people
never made more than album sized prints and designing for constast gave
everyone the impression of more sharpness. This means an airy disc that
is larger with few flare rings (but less resoving power) than a tiny
airy disc dot with flarey rings, which the high resolution prewar lenses
had. This was why Schade found TV worked better with "poor tested" lenes
than the ones that fared best in charts. BobH
As I said before the new glass available after WW2 made Tessar type
lenses the equal of any and six and seven element fast lenses do no
better, just have degree of freedom to reach f/2 or larger. The computer
was used to make exotic zoom lenees not the simple ones. BobH


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