Re: Realist Light Fall off in lenses

[P3D Dr. George A. Themelis <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

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. 

>someone connected with the factory pointed out that some of the f3.5 
>camera's were prone to vignetting.  That's why the Realist aluminum 
>slide mounts have such rounded corners. 

I have noticed the round corners of the Realist aluminum mounts.
I think they are attractive and some times I have wished that the
Albion mounts were like that too.

George Themelis


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