var fDesc=new Array(); fDesc[0] = "Barnack is a program that provides an interactive platform for learning about the intrinsic camera parameters and their effect on the depth of field, the hyperfocal distance, field of view, et cetera.

It is named after Oscar Barnack (1879-1936) who designed the first camera using the 24x36 mm format for German microscope manufacturer Leitz in 1913. This camera was coined the "UR-Leica" and is today widely recognised as the precursor to all 35 mm film cameras."; function tShowHide(id, show) { var s = document.getElementById("desc"); if ((s.innerHTML.length<=212 || show==1) && show!=2) { s.innerHTML = fDesc[id]; if (document.getElementById('m1')) document.getElementById('m1').style.display='none'; if (document.getElementById('m2')) document.getElementById('m2').style.display='none'; if (document.getElementById('more_txt')) document.getElementById('more_txt').style.display='inline'; } else { s.innerHTML = ''; } }