Re: Realist Light Fall off in lenses

[P3D Mike Sherer <mikesher@xxxxxxxxxxxxx>]

Dr. T writes:
> Most people are aware that the Realists 3.5 vignette at small
> apertures, maily f11 and f16.  To see this sometimes you must
> have considerable sky in the picture.  Try a picture of only
> a uniform blue sky at f22 and then conclude about vignetting.
> It is one of those things that some people do not "see" until 
> their attention is directed to it.  Once you notice it, it tends
> to bother you.  It is very possible that some Realist 3.5 lenses 
> vignette more than others.
> 
> Mike told me in Detroit that he is using f16 and f22 for most of
> his pictures.  When I first started, I was doing the same thinking
> that I was maximizing my depth of field.  Now I consider this a
> mistake for two reasons:  There is plenty of depth of field at f11
> and f8 (if you need all the f16/f22 DOF then you must have too much
> depth in your pictures.)  To use small apertures with camera hand-
> held you must either use fast films or slow shutter speeds.  Fast
> films give you grain, slow shutter speeds give you unsharp pictures
> (hand-held).  Now I mostly use f11 or f8 on a sunny/cloudy day
> and will go below 1/50 s only very carefully. 
 
Hey, Hey, Hey. I think a difference of opinion to the point about
aperture preference is fine but what must be pointed out is that
that if a scene in its entirety is sharp at f8 or f11, than it will be
sharper at f16 and f22 (especially objects away from the focal plane).
Granted that the f16 or f22 are not always needed but if you have a 
static scene with enough film speed, why not use a tripod and f22?
Also Ansel Adams (a member of the f45 club) said that he could
tell the difference in quality of his handheld and tripod mounted
shots up to 1/250th of a second shutter.  George is right about
using slower film and less grain, but this is something I did not
notice until I looked at my sky (still no vignetting) Kodachrome 200
photos thru a red-button.

Mike Sherer       Alto, MI
mikesher@xxxxxxxxxxxxx



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