Archived posting to the Leica Users Group, 1996/09/12
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Leica checks each lens visually before shipment. They project a large size
test image while the lens rotates on the projector. This visual check,
performed by an experienced tester, gives a pretty good idea of the quality
of each individual lens.
Gerard Captijn,
Geneva, Switzerland.
>I've recently purchased a new pair of binoculars (Leicas, as it turned
>out), and the thing that struck me was the obvious variations from one
>pair to the next of any particular brand and model. With binoculars the
>subtle and not so subtle quality control problems are obvious. There is
>no intermediate stage of image processing to add variables.
>
>When comparing lens performance I think it would be wise to remember that
>any particular example of one variety of Summicron might outperform any
>particular example of another that varies within the tolerances that
>Leica set at the time of manufacture. Leica sets narrow tolerances, and
>we pay for the lenses that they reject, but that doesn't mean that every
>lens is equal when scrutinized by an eye looking to make distinctions.
>
>In short, take all comparisons with a grain of salt. The methods used
>might be sound, but the items compared might be apples and oranges.
>
>-Charlie
>
>-------------------------------------------
> Charles E. Dunlap
> Earth Sciences Dept.
> University of Calif.
> Santa Cruz, CA 95064
>
> cdunlap@earthsci.ucsc.edu
>408-459-5228 (office) 408-459-3074 (FAX)
>-------------------------------------------
>
>
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