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Re: [OM] lens quality

Subject: Re: [OM] lens quality
From: Winsor Crosby <wincros@xxxxxxx>
Date: Wed, 9 Sep 1998 17:36:15 -0700
>On Dom, 6 set 1998 16:05, William Sommerwerck <mailto:williams@xxxxxxxxxx>
>wrote:
>>My understanding is that Leica's "normal" lenses are hand-assembled,
>>taking into account the slight variations in surface curvature among
>>elements. This does not necessarily make a "better" lens, but it does
>>greatly reduce sample- to-sample variation.
>>
>
>Every quality lens maker corrects the slight variations of diffraction
>value of the bulks of optical glass they buy with variations of
>curvature/design of the elements. In this way they obtain good uniformity.
>Of course if a highest quality manufacturer also trys to optimize the lens
>by matching the best combos of elements this should lead to an even better
>uniformity of production quality.
>
>Marco
>
A minor point is that Leitz was very proud of the fact that they did not
buy their glass, but made it themselves.

Winsor

Winsor Crosby
Long Beach, California
mailto:wincros@xxxxxxxxxxx





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