Your comments make some sense for ups Pentax users who can use
just about any lens Pentax ever made.  But, for those other
brands?  However, I would venture if you make your living with
your camera you won''t be using elderly equipment, you could not
afford to.
--Tom


"Provencher, Paul M." wrote:
 
> The mechanical construction makes for a lens that will certainly not last as
> long.  "Pro" zooms will perhaps have a much longer life than non-"Pro"
> zooms, but both will not live as long as a "Pro" prime.  This is a practical
> consideration that will not affect image quality (initially) and so it is
> left to the photographer to decide the importance of this.
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