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The Vikings probably mined iolite from deposits in Norway and Greenland. Viking sailors used iolite as a polarizing filter to find the sun on cloudy days for a safe offshore navigation. Iolite is usually a purplish blue when cut properly

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IOLITE - the name "iolite" comes from the Greek "ios", which means violet. The Vikings probably mined iolite from deposits in Norway and Greenland.

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How to Use and Buy Polarizing Filters - Digital Photography School samfeinstein Be sure to get a "circular" polarizer (for TTL metering) and if you want it on a wide angle lens, get s "slim" filter that won't cause vignetting.

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Tiffen 37mm Circular Polarizing Filter Trying to decide on polarizing filter... good price, good reviews.

* How to Use and Buy Polarizing Filters - great for shooting in bright sun to get more vibrant color to skies and landscapes. Hoya is a good brand. Take note of the diameter of your lens before making a purchase as there is a large variety of lens sizes.

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from Light Stalking Photography Blog and Community

Everything You've Ever Wanted to Know About Polarizing Filters

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