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[OM] RE : Re: RE : Re: RE : Re: RE : Re: Battery question

Subject: [OM] RE : Re: RE : Re: RE : Re: RE : Re: Battery question
From: "stephan Van den Zegel" <stephan@xxxxxxxxxxxxxx>
Date: Sun, 15 Apr 2007 13:54:09 +0200
Tessar was indeed slower, cheaper but usually sharper... It's a very
sharp design... when you use the middle range of the f scale

Sorry for my words about the 40/2... but the very rare 40/2,8 in LTM is
definitvly a tessar design.



-----Message d'origine-----
De : olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] De la
part de Andrew Fildes
Envoyé : dimanche 15 avril 2007 03:18
À : olympus@xxxxxxxxxx
Objet : [OM] Re: RE : Re: RE : Re: RE : Re: Battery question


Looks similar to me - they all seem to have a basic, symmetrical hole- 
in-the-middle, six-in-five design - the 1.4 and 1.2 have an  
additional rear element. Other manufacturers' standard lens diagrams  
I've seen look very similar. Isn't this what's referred to as a  
'double-gauss' design?
The Tessar was Zeiss's slower, cheaper option - for fast and pricey  
you bought a Planar. Or a Sonnar in the little compacts.
Andrew Fildes
afildes@xxxxxxxxxxxxx



On 15/04/2007, at 9:56 AM, Chris Crawford wrote:

> The zuiko 40 is not a Tessar. A tessar is a four element in 3 group  
> design,
> while the Zuiko 40mm f2 is a six element in six group design. Seen  
> here:
>
> http://olympus.dementia.org/eSIF/om-sif/lensgroup/40mmf2.htm
>
> It's actually a pretty unique design, the cross section doesn't  
> look like
> any of the standard designs used for 50mm lenses.



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