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Tessar <==> Biometar ?!?
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PostPosted: Tue Jun 19, 2007 9:29 am    Post subject: Tessar <==> Biometar ?!? Reply with quote
Hi,

I recently stumbled across a K6 Tessar (in contrast to the Biometars you usually find) and was asking myself about the differences in construction,
if any.
Afaik, both (usually) consist of 4 lenses in 3 groups, so where's the clue?
Is is maybe the same as with "Car Zeiss Jena" and "aus Jena", where at
a point in time CZJ wasn't allowed to carry "Zeiss" in the name?
Maybe the same that they couldn't use "Tessar" anylonger and therefore invented the Biometar?

Cheers!


PostPosted: Tue Jun 19, 2007 1:16 pm    Post subject: Re: Tessar <==> Biometar ?!? Reply with quote
Cobalt60 wrote:
Hi,
I recently stumbled across a K6 Tessar (in contrast to the Biometars you usually find) and was asking myself about the differences in construction,
if any.
Afaik, both (usually) consist of 4 lenses in 3 groups, so where's the clue?
Is is maybe the same as with "Car Zeiss Jena" and "aus Jena", where at
a point in time CZJ wasn't allowed to carry "Zeiss" in the name?
Maybe the same that they couldn't use "Tessar" anylonger and therefore invented the Biometar?
Cheers!


As far as I know, the Biometar is the successor of the mythical Biotar (the most popular lens in the Twenties and early Thirties).

I don't know which degree of relation they have with the Tessar.


PostPosted: Tue Jun 19, 2007 7:12 pm    Post subject: Reply with quote
Biometar is a double gauss with 5 elements in four groups (following the planar design), whereas tessar is a triplet with 4 elements.

Links:
http://en.wikipedia.org/wiki/Zeiss_Tessar
http://www.taunusreiter.de/Cameras/Biotar_en.html

Michael


PostPosted: Tue Jun 19, 2007 7:22 pm    Post subject: Reply with quote
GREAT Link! Thanks a lot!!!
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