Op Wed, 04 Jun 2008 18:52:43 +0200 schreef P. J. Alling  
<[EMAIL PROTECTED]>:

> Interesting, the lens contains not one but two composite, aspherical
> elements, the composite aspherical element was the achillies heel of the
> smcp FA 28-70mm f4.0 an otherwise exemplary little lens.
>
> Dario Bonazza wrote:
>> http://www.dpreview.com/news/0806/08060301pentax17-70sdm.asp

Are you sure it was the composite AL element that comes loose on some  
28-70's? There seem to be two groups of two cemented elements in this  
lens: http://bdimitrov.de/kmp/lenses/zooms/_optics/28-70f4.gif. It could  
be one of those...

-- 
Ciao, Lucas

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