//8.47 & 6.35 les valeurs sur les docs sony : respectivement : 6 et 4.5 mm

				//=2*ATAN((B3/2)/C3)

				//=( 180 * D3) / PI



				function  jeCalcul() {

						var PI = 3.14159;

						if (document.calcul.ccd1.checked) {

								var capteur ="1/3";

								var angle = Math.atan(3/(document.calcul.focale.value));
                                var angleH = Math.atan(2.4/(document.calcul.focale.value));
								var angleV = Math.atan(1.8/(document.calcul.focale.value));
								var angle = 2* angle;
								var angleH = 2* angleH;
								var angleV = 2* angleV;

								var angle = (180/ PI)* angle;
								var angleH = (180/ PI)* angleH;
								var angleV = (180/ PI)* angleV;

						}

						else {

								var capteur ="1/4";

								var angle = Math.atan(2.25/(document.calcul.focale.value));
                                var angleH = Math.atan(1.8/(document.calcul.focale.value));
								var angleV = Math.atan(1.35/(document.calcul.focale.value));
								var angle = 2* angle;
								var angleH = 2* angleH;
								var angleV = 2* angleV;

								var angle = (180/ PI)* angle;
								var angleH = (180/ PI)* angleH;
								var angleV = (180/ PI)* angleV;

						}

						//alert ('ccd : '+ capteur+ ' focale ' + document.calcul.focale.value+ ' mm >> '+ angle + ' °')

						document.calcul.resultat.value = angle;
						document.calcul.resultatH.value = angleH;
						document.calcul.resultatV.value = angleV;
						document.calcul.ccdSize.value = capteur;


						var Xangle= 0.5* angleH;
						var Xangle= (PI/180)* Xangle;
						var champ=2*(Math.tan(Xangle))*(document.calcul.distance.value);

                        //alert ('champ' + Xangle + ' ' + champ)
						document.calcul.champ.value = champ;

					}

				 function  CheckCCD(ccd) {

						if (ccd == 1) {

								document.calcul.ccd1.checked= true;

								document.calcul.ccd2.checked=false;

						}



						 if (ccd == 2) {

								document.calcul.ccd2.checked= true;

								document.calcul.ccd1.checked=false;

						}





				}