</span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (Ed Sukach @ Apr 9 2003, 10:50 PM)</td></tr><tr><td id='QUOTE'>A "Dichroic" filter is better described as a "heat glass", ... an Infrared filter for *really invisible* infrared radiation, otherwise known as "heat".</td></tr></table><span class='postcolor'>
A Dichroic Filter is based on light inference instead of dyes. This is the reason why the don&#39;t wear out (except from getting dirty). Whether a Dichroic Filter absorbs, reflects or passes IR light, depends on the characteristics/specifications of the filter. Not all Dichroic Filters cancel IR nor are all "hot mirrors". Even if they would be, the effect would be dependent on the amount of filtration dialed in.