http://www.theexpertreviews.com/heliopan-77mm-digital-filter/
Heliopan 77mm Digital Filter
Heliopan 77mm Digital Filter has been specifically designed for imaging with digital sensors. Digital sensors have a significantly higher sensitivity to the infrared spectrum than film material. This filter blocks both ultraviolet and infrared light. The result is improved color separation, saturation and sharpness. The UV protection blocks the UV radiation found in daylight. Co [...]
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