I suppose you mean leaf shutters, aka interlens shutters, aka Synchro-Compur, aka Copal#0 or 1 or 2 etc. That design can't be used at the focal plane because it begins opening from the centre, and finishes closing at the centre, which would cause a huge exposure imbalance between the centre of the frame and the corners. That doesn't matter within the lens where the image is still unresolved.
As, well, the aperture of the fully opened shutter would need to be as big as the format's diagonal measurement, which is many times bigger than it needs to be inside the lens. Regards, Anthony Farr > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > Jostein Øksne > Sent: Tuesday, 7 November 2006 9:53 PM > To: Pentax-Discuss Mail List > 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 > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
