FOCAL PLANE SHUTTER AND DIGITAL BACK

jotloob

MFF-Patron
Hi
As far as i understand IMACONS webpages , a digital back can be attached to any HASSELBLAD Model (adapters required) but a a lens with central shutter is required .
Can anyone please tell me , why a central shutter is needed when using a digital back .
Regards Jürgen
 
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