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EF 28-135mm f/3.5-5.6 IS USM (1)
 
 
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CMS-XML EF28-135mm f/3.5-5.6 IS USM: How to use Infrared Index.
The figures in red above the distance ring are the infrared index. The infrared index is used when black and white infrared film is used. After achieving focus, shift the current distance setting of the distance ring to the infrared index mark