Irix Edge filters are made from tempered optical glass with anti-reflection coatings, high transmission NANO coating and oleophobic layer at both sides of the filter.
The Alta Sky 68 is a new style of backpack that is designed for photographers who don't just want to carry a long lens attached to the camera on their trek.
Ever wondered what the real-world differences are between Sigma's Art and Contemporary lenses, and which one might suit you better? Tim from Sigma UK breaks it down in this on-location comparison.
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