Andy, Don't know if this fits with your project requirements, but what about a low-tech, gravety-drop shutter? AZ Build a 120/35mm Lookaround! The Lookaround E-Book 5ed. NOW SHIPPING http://www.panoramacamera.us > -------- Original Message -------- > Subject: [SPAM] Re: Leaf shutter on DSLR, why? > From: ADavidhazy <andpph@xxxxxxx> > Date: Thu, March 19, 2009 9:15 am > To: List for Photo/Imaging Educators - Professionals - Students > <photoforum@xxxxxxxxxxxxxxxxxx> > Apologies to Per, Roger and Karl and all ... > You are correct. I was (am) quite aware of the "standard" possibilities of > a leaf shutter as opposed to a focal plane one. Such as electronic flash sync > at all speeds (allowing for the fact that at very short exp times one might > cut into the output of the flash) and simultaneous exposure of the image as > opposed to the sequential nature of the exposure made with FP shutter leading > to focal plane shutter distortion, etc. > Also, Roger, you are quite correct in that the exposure time on the DSLR could > have been less than 2 seconds but that would make synchronization more difficult. > I first fired the DSLR. Then the model we were photographing started to move when > she hard the DSLRs shutter open which then was an indication to me to fire the > leaf shutter. 2 sec. was just a matter of convenience. > As for eliminating daylight in synchro-sun exposures ... yes, the leaf shutter > did provide an advantage but today even my lowly Canon has "x" capability up to > a 1/200 second and the leaf shutter peaks at 1/500 second ... not much of a > "gain" so to speak. > Anyway, sorry about not being more complete last night. I had just come out of class > and was happy to have used a DSLR instead of doing the demo using Polaroid. This way > the students appreciated that they could do this and possibly appreciate the use > of a leaf shutter for 2nd or rear curtain sync applications. (I doubt it though!) > Further, some time ago I wrote up a little article on "tail flash" sync. I think > I posted the URL here in the past but so here it is again: > http://people.rit.edu/andpph/text-tailflash.html > In any case, if you can think of obscure, obtuse and possibly unthought of (or little > thought of) applications for a leaf shutter attached to a fp shutter equipped camera > I'd be happy to hear about it. Like when Karl mentioned ripping LCD displays apart > to extract their polarizing filters or the use of the LCD as a source of polarized > light. I incorporated both of these "tidbits" into the larger text related to > using the LCD as a viable source of polarized light for related applications. TX! > ok ... back to lurking so to speak! > andy
