[OM] Re: Telecentricity

[Chuck Norcutt]

Moose wrote:

> Do we have any source which allows us to really know what the image 
> circle of the DiZeta lenses is? We know the diagonal of the sensors, and 
> generally assume that is the limit of lens coverage. In theory, Oly 
> could have designed them all for a slightly larger diagonal for future 
> flexibility. The current sensor is a 22.5 mm diagonal. A 4/3 ratio, 
> 15x20 mm sensor would have a 25 mm diagonal.
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Based on the amount of vignetting visible in dpreview's test of the 
14-54 at 14/2.8 <http://www.dpreview.com/reviews/olympuse1/page17.asp>
I would say the usable image circle can't be much bigger than the 4/3 
sensor.

I wouldn't be surprised but what Oly's 4/3 partners have been testing 
Oly lenses for this very situation.  If Oly was actually designing for a 
25mm image circle and telling their partners the standard is 22.5 the 
other guys could be rightfully PO'd if they suddenly release a larger 
sensor or we were to discover they've allowed extra on the image circle 
to accommodate Minolta style anti-shake.

Chuck Norcutt


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