I hope no one minds me contributing to a dead thread. My wife had her gall bladder removed last week so my priorities have been elsewhere. Perhaps by the end of the evening I can get my PDML backlog under the one thousand mark :)
This caught my eye: ----- Original Message ----- From: "Bolo" <[EMAIL PROTECTED]> (snip) > -- but there is already uneven > exposure center to edges caused by the leaf shutter. > (snip) If you stop and think about it this can't be true. A leaf shutter opens from the centre then closes back to the centre. This means that the first and last moments of an exposure are at minimum aperture, quickly enlarging to the working aperture where the bulk of an exposure is made. Most of an exposure produces no difference in fall-off of illumination compared to an exposure by a perfect focal plane shutter. The very small portion of exposure that occurs during the opening and closing of a leaf shutter can only reduce light fall-off, not increase it, because lenses have more even light distribution at smaller apertures. OTOH leaf shutters theoretically give an increase in depth of field for any given aperture due to the part of exposure made at less than the working aperture, but again this would be practically undetectable. Regards, Anthony Farr - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
