Hi,

there are leaf schutters for LF that are mounted behind the lens, they 
are big, and lightning fast:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180047904417

Pancho


mike wilson schrieb:
>> From: "Jostein Øksne" <[EMAIL PROTECTED]>
>> Date: 2006/11/07 Tue AM 11:53:10 GMT
>> To: "Pentax-Discuss Mail List" <[email protected]>
>> Subject: Stupid Q. about central vs. curtain shutter
>>
>> If it was possible to make a focal-plane shutter like the central
>> shutters in eg. hasselblad lenses, I suppose someone would have done
>> it a long time ago.
>>
>> Does anyone know why this is not a good idea?
>>
>> Jostein
> 
> If I understand the concept correctly, the leaf shutter in a lens works at a 
> node, where all the light rays cross.  Or, at least, as close to that as they 
> can.  This allows them to be quite small and responsive.  If they were at 
> focal plane, they would have to be much, much bigger and more complicated.  
> This would make them less responsive.  I suspect that there would have to be 
> some innovative design to make exposure consistent across the frame, also.  
> What brought this on?

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