Archived posting to the Leica Users Group, 2004/10/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 05:29 PM 10/5/2004, eric wrote: >Nope - I took a look this evening into the lens of my konica KD-500Z. >Definitely a shutter closing and opening. As I said, some have real shutters. but they do not determine the actual exposure. They open and get out of the way, the substrate is pulsed (there MUST be a substrate pulse in order to actually make the sensor collect the light. The length of the pulse determines the window in which the light is collected. There are some odd ball set-ups that pulse the substrate on, use a real shutter to plop the light onto the sensor, and then drop the substrate pulse when the real shutter closes. These can work OK as long as the sensor is the kind that can tolerate a long substrate pulse, longer than the shutter speed. You'll find lots of low and intermediate P&S cameras with the inability to take long exposures. Mainly because the cheap sensors have a max pulse width, which amounts to around 1/30th second. These cameras cannot take silky waterfall pictures. There are lots of goofy combinations in order to get around patents. Bottom line, a sensor exposure is via a substrate pulse. Everything else is ancillary. JB