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Re: [Rollei] Why the 6-element lens for 3.5Fs

At 10:25 AM 4/30/03 -0700, Kotsinadelis, Peter (Peter) wrote:
>It was mentioned in a previous post that F&H went to great lengths to
>ensure the quality of the lenses received from Zeiss.
>F&H tested each lens and allegedly rejected up to 50% that did not meet
>their standards.  Could it have been Zeiss who decided on the added 6th
>element for the 3.5 Planar?  After all it was said this element was
>added to ensure the the lenses met the standards of F&H, so if Zeiss did
>this it may have reduced the number of rejected lenses.  Just a thought.
>BTW, those lenses rejected by F&H, where did they go? Back to Zeiss? Or
>were they sold elsewhere?


Franke & Heidecke did NOT reject 50% of Zeiss Planars.  The rejection rate
for both Planar and Xenotar was less than 5% and the lenses were returned,
as appropriate, to Zeiss or Schneider, who destroyed the glass and reused
the mounts, for the most part.

Linhoff found that they rejected around 5% of Zeiss lenses and 3% of
Schneider lenses, but that was when Zeiss was swamped with orders and was
winding up its LF lens operation.


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