I have a focal-plane shutter tester app that uses the sound of the shutter curtains to determine when the first and second curtains land, using that plus the size of the format to calculate effective exposure time. It seems pretty accurate.
I haven't used it in some time, I wonder if it runs properly on the latest iOS? G > On Mar 24, 2016, at 8:04 AM, steve harley <p...@paper-ape.com> wrote: > > i think one could test shutter speed by photographing an object moving at a > known (fast) velocity across a grid, the direction of motion chosen so that > the shutter curtain movement doesn't interact with the object; use the grid > to measure the length of the blur and divide by the velocity -- 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.
