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

todd wrote,

> Well, at least two of us on this list have 2.8 Zeiss-Opton Tessars on
> Rollei 2.8 A cameras that are stinkers as far as sharpness goes. I have
> a 2.8 A with Jena Tessar that is tack sharp, another 2.8 A with Jena
> Tessar that was replaced with a Zeiss-Opton Tessar that is very soft
> (early serial number on this camera denotes it should have had a Jena
> Tessar and collimator test reveals that the lens is just plain 'ol bad)
> and a late 2.8 A (MX model) with Zeiss-Opton Tessar that is very sharp.
> All cameras are in beautiful condition and have not been tampered with.
> So in my microcosm of 2.8 A cameras, I have exactly what you describe of
> the Zeiss-Opton 2.8/80 Tessar.

Thanks, Todd. Usefull information.

"Very sharp" vs "very soft"... I think i will continue trying to find a way
to clean the insides of my lenses, in the (perhaps idle) hope that mine will
be of the first kind.

Richard's comment about the "burnished or spun-in mounting for the rear
component" isn't encouraging though.
But then, maybe i don't need to remove the rear "group"? Maybe there's
another way in. I thin i'll keep trying (as long as i'm confident i'm not
doing anything irreversible).