Archived posting to the Leica Users Group, 1997/07/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Basic stuff, guys. I dont know the specs on the R8, but I assume it has a focal plane shutter of some sort, so the actual time the mirror is up will be a bit more than the X synch speed. In the case of M cameras, this is 1/50 sec (the blitz mark). It is the shortest speed for which the entire shutter is open at once. Shorter speeds: 1/60, 1/125, etc. have the second curtain released shortly after the first, so that at 1/1000 you essentially have the two curtains moving accross the frame a few mm apart. Each bit of emulsion is exposed to light for 1/1000 second, but it taked 1/50 second to exposed the entire frame. On Fri, 25 Jul 1997, "Roger Beamon" <beamon@primenet.com> wrote: >On 25 Jul 97, ted grant wrote: > ><snip> > >>Think about making an exposure of 1/8000 of a second! >> That means the mirror goes up and down in almost the same time frame. To >> the extent you do not think you have lost the image, when in actual fact >> you lost it for 1/8000 of a second! :) > >Doubt this, but I'm a bit confused by your syntax above. I suspect that >the mirror has a finite physical limit on how fast it can go up and return >to rest. Shutter speed beyond this merely means that the mirror does the >best that it can, while the exposure is actually made in less time than >the mirror was operating. > >Technology keeps allowing faster cyclic speeds for the mirror, but I doubt >that it's cyclic rate has reached 1/8000 second yet. Don't have >specfications here that say; does anyone know the minimum mirror cycle >time for the R8? >-- >Roger Beamon > Naturalist & Photographer > Leica Historical Society Of America > mailto:beamon@primenet.com > > Thought for the day: > As always, avoid alliteration. >