In the glory days of film and turntables, the technique was to photograph the turntable with a chalk mark on it at 33rpm, or 78rpm for the higher shutter speeds. You could then (theoretically) work out the effective exposure from the arc covered by the mark. Tried it a couple of times and decided that either my turntable or my maths ability were crap!
John in Brisbane -----Original Message----- From: PDML [mailto:[email protected]] On Behalf Of steve harley Sent: Friday, 25 March 2016 01:04 To: Pentax-Discuss Mail List <[email protected]> Subject: Re: Pentax Full Frame Review (August 1981) On 2016-03-23 20:38 , Igor PDML-StR wrote: > It got me thinking: how much of the shutter accuracy measurements > matter now? I.e., how accurate the shutter speed of the modern DSLRs is? > I haven't seen those tests done for any of the digital cameras. > > I suspect that DSLRs would not be as easy to disassemble... 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 [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
