New Infra red IR 780-1600nm filter for Cokin Z holders (Wratten 89B Hoya R72)

The filter response is similar to that of a Wratten 89B or Hoya R72 though a little higher, it is 50% transmissive at 780nm and 90% from 810 to 1350nm only dropping below 70% again above 1600nm. Suitable for Cokin 'Z' and Lee 100 filter holders, this is the one pictured on the left of the three and is 100x100mm.

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