Field Depth

Description
For all you photography enthusiasts out there, this script makes it a breeze to determine the field depth and amount that will be in focus in a photograph. Includes other measurements such as nearest and furthest points of focus, too....View A Script Demo

Do you find it confusing setting up these script?
Java Scripts Magic can do all the hard work for you all At The Touch Of A Button.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">

<HTML>

<HEAD>

<META NAME="Generator" CONTENT="TextPad 4.4">

<LINK href="general.css" rel="stylesheet" type="text/css">

<SCRIPT LANGUAGE="JavaScript">

<!-- Original:  alistair@silverlight.co.uk -->

<!-- Web Site:  http://www.silverlight.co.uk -->

<!-- Begin

// 
  This e-mail address is being protected from spambots. You need JavaScript enabled to view it
 
// 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 Background=../graphics/grayback.jpg>

<center><BR><BR><BR>

<form method=post name=form>

<table border=3 cellpadding=10 cellspacing=0 width=500>

<tr>

<td align=center colspan=2>

Depth of Field Calculator

</td>

</tr>

<tr>

<td align=left>

Negative Format

</td>

<td align=left>

<select name=format>

<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>

<td align=left>

Lens focal length

</td>

<td align=left>

<select name=focal>

<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>

<td align=left>

Selected aperture

</td>

<td align=left>

<select name=aperture>

<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>

<td align=left>

Subject distance (Meters)

</td>

<td align=left>

<input type=text name=distance value="" size=6>

</td>

</tr>

<tr>

<td colspan=2 align=left>

<br>

<center><input type=button value="Calculate." onclick="doField(this.form)"></center>

<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>

</BODY>

</HTML>

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