JavaScript: Calculator Script - Field Depth Calculator

Main Calculator Script Field Depth Calculator

<!-- TWO STEPS TO INSTALL FIELD DEPTH CALCULATOR:

1.  Copy this part of code inside your HTML HEAD

2.  Add the last code into the BODY of your HTML document  -->

<HEAD><title>JavaScript, java script, javascripts, script, javascript free code!</title>

<!-- Begin

// alistair@silverlight.co.uk

// http://www.silverlight.co.uk

function doField(form) {

distance = (form.distance.value)*1000;

CoC = (document.form.format.options[document.form.format.selectedIndex].value);

aperture = (document.form.aperture.options[document.form.aperture.selectedIndex].value);

focal = (document.form.focal.options[document.form.focal.selectedIndex].value);

if (isNaN(distance))  {

alert('Please enter a numerical value for subject distance.');

document.form.distance.focus();

document.form.distance.select();

}

else {

hyperFocal = (focal * focal) / (aperture * CoC);

form.hyperFocal.value  = Math.round(hyperFocal) / 1000 + " m";

dofNear = (hyperFocal * distance) / (hyperFocal + (distance - focal));

form.dofNear.value = Math.round(dofNear) / 1000 + " m";

dofFar = (hyperFocal * distance) / (hyperFocal - (distance - focal));

if (dofFar < 0) {

form.dofFar.value  = "Infinity.";

}

else {

form.dofFar.value  = Math.round(dofFar)/1000+" m";

}

dofTotal = Math.round(dofFar - dofNear);

if (dofTotal < 0) {

form.dofTotal.value  = "Infinite.";

}

else {

if (dofTotal >= 0 && dofTotal < 0.001) {

form.dofTotal.value  = ">1 mm ";

}

else {

form.dofTotal.value = dofTotal / 1000 + " m";

}

//  End -->

</script>

</HEAD>

<BODY>

<tr>

Depth of Field Calculator

</td>

</tr>

<tr>

Negative Format

</td>

<option value=0.033>35 mm

<option value=0.025>APS

<option value=0.05>6x45 cm

<option value=0.06>6x6 cm

<option value=0.065>6x7 cm

<option value=0.15>5x4 inch

<option value=0.3>10x8 inch

</select>

</td>

</tr>

<tr>

Lens focal length

</td>

<option value=17>17 mm

<option value=20>20 mm

<option value=24>24 mm

<option value=28>28 mm

<option value=35>35 mm

<option value=50>50 mm

<option value=70>70 mm

<option value=80>80 mm

<option value=100>100 mm

<option value=135>135 mm

<option value=150>150 mm

<option value=200>200 mm

<option value=210>210 mm

<option value=300>300 mm

<option value=350>350 mm

<option value=400>400 mm

</select>

</td>

</tr>

<tr>

Selected aperture

</td>

<option value=1.4>F 1.4

<option value=1.8>F 1.8

<option value=2>F 2

<option value=2.8>F 2.8

<option value=4>F 4

<option value=5.6>F 5.6

<option value=8> F 8

<option value=11>F 11

<option value=16>F 16

<option value=22>F 22

<option value=32>F 32

<option value=45>F 45

<option value=64>F 64

<option value=90>F 90

</select>

</td>

</tr>

<tr>

Subject distance (Meters)

</td>

</td>

</tr>

<tr>

<br>

<p>

<input name=hyperFocal type=text value="" size=6> Hyperfocal distance for this lens/aperture combination.

<BR>

<input name=dofNear type=text value="" size=6> Near limit of acceptable sharpness.

<BR>

<input name=dofFar type=text value="" size=6> Far limit of acceptable sharpness.

<BR>

<input name=dofTotal type=text value="" size=6> Total depth of field.

<BR>

<br>

</td></tr>

</table>

</form>

</table>

</center>

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</center><p>

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