General purpose large-format lenses are often designed to yield optimal results when photograping subjects at medium-to-far distances, or within a focal range o f 1:10 to infinity, and sometimes as close as 1:5 to infinity. It seems that it is not too unusual to encounter situations where it is desirable to photograph a person or thing closer than 1:10--for example 1:7--or even closer than 1:5--say 1:4 or 1:3. Is a process or flat-field lens the better or proper lens to use i n such situations? I am not a still-life photographer, but is a process/flat fi eld lens what still-life photographers typically use for such ranges, or do they just use general purpose lenses? And what exactly happens when a lens is used outside of its optimal focus range? For instance, does sharpness and resolution markedly decrease? Do any other problems occur?
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