Response to Maco IR820c Speed Rating? Your experiences? General Discussion...

Another tip: Use your search engine for "Orwo, infrarot, filter". This should get you to the page of a photo shop in Berlin that is selling a wide array of ORWO infrared gels cemented between glass and mounted in filter rings. These are left overs from GDR days. These filters are very accurate in their cutt of frequencies and cheap in comparison to many other IR filters. For your purpose this may not be of special importance, but if you want to use IR for sciencitific use you want to make sure that the filters are accurate, so that you can determine the spectrum you actually record. Many filters sold as IR filters -- even when they state equivalent Wratten numbers -- are not. The ORWO filters are often a little denser than others, but their quality is superb. ORWO was the main supplier for high quality IR products for the whole Eastern Block and their IR plates (they had a variety of to 900nm) were a class of their own.

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