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Re: [Rollei] Why the 6-element lens for 3.5Fs
- Subject: Re: [Rollei] Why the 6-element lens for 3.5Fs
- From: Martin Jangowski <martin
- Date: Wed, 30 Apr 2003 20:27:46 +0200 (CEST)
On Wed, 30 Apr 2003, 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.
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.
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