Toralf Lund wrote: >>> as has been pointed out many times there are perhaps 40,000 photons >>> available to be counted >> >> Wouldn't the number of photons vary considerably with exposure time >> (shutter speed)? >> >It's also a question of the number of electrons available. When a photon >hits the sensor, its energy will be used to move an electron from one >place to another, thus building up a charge (in an ideal senor - I think >a practical one will sometimes require more than one photon.) There is, >however, a limit to the number of electrons that may "jump" and/or be >held as a charge (no, not "held in charge"...). This limit is believed >to be approximately 40000 per pixel or photosite for the 10MP sensor.
This limit "is believed to be" 40000 per pixel? Who believes this and why? -- Mark Roberts Photography & Multimedia www.robertstech.com 412-687-2835 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
