Mirror, shutter, and aperture control are not mechanically linked in modern dSLRs. They are separately actuated using servos.
They are most likely setup that way because the timing chain is already setup and it's much easier to tell the camera to actuate 3 times, than to reprogram the timing chain to lift the mirror, close the aperture, and open-close the shutter x times. On Wed, May 12, 2010 at 12:13 PM, Godfrey DiGiorgi <gdigio...@gmail.com> wrote: > Of course it needs to operate the shutter ... all electronic shutters > as yet do not have the control and resolution possible with a > mechanical shutter. And like with most SLRs, the shutter regulation, > aperture control and mirror are a linked mechanical operation so > there's no good way to cycle the shutter without also cycling the > others. > > On Olympus bodies, the auto-bracket feature and the "capture three on > one shutter press" are implemented separately: you have to turn on > auto-bracket AND drive mode to achieve this automation. I find this > very useful in some situations (say when using a flash unit to allow > time for recycling). > > If a camera has independently, electronically controlled shutter, > mirror and aperture operation, then an option to do auto-bracketing on > one press cycling only the shutter as quickly as possible would be a > nice feature for use when appropriate. I don't believe it's possible > with the design of today's Pentax (or any other) SLR bodies. > > On Wed, May 12, 2010 at 8:10 AM, Larry Colen <l...@red4est.com> wrote: >> On Monday night I was photographing a dance and was having a really rough >> time with exposure. I was shooting in manual mode, I'd take a picture, then >> the next time I shot, the exposure was way off. Or it would change. It >> took me a while to realize that I had left the shutter in "bracket". >> >> There is no reason that pressing the shutter once in bracket mode shouldn't >> take all three exposures. >> >> For that matter, it should be designed so that the mirror doesn't flop and >> bounce after every exposure. I'm not even sure that it should need to fire >> the mechanical shutter between each exposure. >> >> >> -- >> Larry Colen l...@red4est.com sent from i4est >> >> >> >> >> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > > > > -- > Godfrey > godfreydigiorgi.posterous.com > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Aloha Photographer Photoblog http://alohaphotog.blogspot.com/ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
