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

[Martin Jangowski <martin]

On Wed, 30 Apr 2003, Kotsinadelis, Peter (Peter) wrote:

> 
> 
> All,
> 
> 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.

This is very much possible. After all, new lens formulas are often created
to enlarge manufacturing tolerances while getting the same quality.
You can steer the development a new optic to better quality or
larger tolerances, but usually not both.

Martin

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