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