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Cold  Diffuser
 Diffusion filters often collect light from outside the image area that can mislead the camera meter and cause it to underexpose.
  Long focal-length lenses require less diffusion than short ones to achieve the same visual effect

088 Cold Diffuser

No filter


 with sun from behind
light from outside the image area  mislead the camera meter and cause it to underexpose this photo. (Ok, truth is I set the camera to auto and forgot to increase 2 stops but we learn by doing , Right?) Diffuser's work best when overexposed.


        


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On line Cokin Filter catalog


Cold Colour Diffuser
Ref. 088