JavaScript Source Code 2002: Calculators: Field Depth Calculator

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Field Depth Calculator

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.

JavaScript Source Code 2002: Calculators: Field Depth Calculator
Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s). The script is yours!!!

  <HEAD> <SCRIPT LANGUAGE="JavaScript">   <! > <! >  </script> </HEAD>  <BODY> <center> <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>

Depth of Field Calculator
Negative Format
Lens focal length
Selected aperture
Subject distance (Meters)
Hyperfocal distance for this lens/aperture combination. Near limit of acceptable sharpness. Far limit of acceptable sharpness. Total depth of field.