On Wed, Jun 22, 2011 at 1:02 PM, Larry Colen <[email protected]> wrote:
> I'm sure that someone more proficient at math than I can figure out minimum > shooting distance for each focal length at a particular pixel density were > the parallax difference is less than a pixel. Far. Let's suppose your shooting lens gives a horizontal field of view (HFOV) of 1 radian (57.3 deg). For an APS-C sensor, that corresponds to a ~22mm focal length. With a 1 rad HFOV, a 1 pixel parallax shift (against an infinitely distant background) will occur for an object that's at a distance equal to the separation of the lenses, multiplied by the number of horizontal pixels on the sensor (4928 pixels for the K-5). (*) The body width of the K-5 is ~13 cm, so if you have tightly-packed cameras, objects (13 cm)*(4928) or farther will show less than 1 px parallax shift against a distant background. That's 640 meters, or 0.4 miles. -- 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.
