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Old Oct 29, 2003, 11:19 AM   #1
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Default Infrared Filter Question

What is the difference between an "Infrared" filter (like Hoya IR72) and a "red" filter (like SunPak Red 25)? :?:

(besides the price)

Thank you
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Old Oct 29, 2003, 4:13 PM   #2
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The R72 pass far less visible light. Go to the link below and pan down about 2/3's the way (or just search for R72). You'll find a chart comparing the transmission specs of various filters.

http://www.cocam.co.uk/CoCamWS/Infrared/INFRARED.HTM

FYI, visible light lies roughly between 400 to 700 nanometers with IR above (>700) and UV below (<400).
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Old Oct 29, 2003, 5:36 PM   #3
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a red 25 is not an IR filter at all. it is a very popular in shooting black and white photographs. it is used for contrast.
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Old Oct 30, 2003, 7:30 AM   #4
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Ok, thank you. So is Hoya the only filter mfg. that makes IR filters?
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Old Oct 30, 2003, 7:41 AM   #5
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heloipan
B+W*
hoya*
rodenstock
are the most well known. there are others.

*these are the biggies in the market
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Old Oct 30, 2003, 8:33 AM   #6
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ok, thank you, looks like the hoya costs less
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