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Extra-low Dispersion Glass

ED (Extra-low Dispersion) glass is the result of an alternative glass manufacturing technology…

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Marketplace: A #1

Shooting with the COOLPIX A

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How to Read Your NIKKOR Lens Barrel

Understanding what all of those markings and designations on your lens really mean.

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Chromatic Aberration

Chromatic aberration is a phenomenon in which light rays passing through a lens focus at different…

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Jim Richardson: Why Fast Lenses Make All the Difference

When You’re Constantly on the Move, Fast Glass Makes Tough Shots…

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Second Time Around

Take a closer look at some of our classic lenses updated with the latest technology.

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3D Mode

Capture images in 3D for viewing on 3D compatible HDTVs and computers.

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Zoo and Wildlife Photography

Spend a day at the zoo with wildlife photographer Julie Larsen Maher

Beginner

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Tips and Techniques For High Flying Photos

Tom Bol discusses taking photos from hot air balloons, planes and helicopters

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Making Pictures in the Rain

Just because it's raining doesn't mean there aren't great pictures waiting to be made.

Beginner

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The Challenge of Bird Photography

Moose Peterson tells why photographing birds in the field is well worth the challenge.

Advanced

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Tips For Making Tempting Food Photos

Alison Lyons offers simple tips for taking great photos of food & drink

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Extra-low Dispersion Glass

Nikon’s Extra-low Dispersion (ED) and Super ED glass help correct chromatic aberrations, or optical color defects, caused when different light wavelengths do not converge at the same point after passing through optical glass. Calcium fluorite crystals were once used to correct this problem in telephoto lenses, but the substance cracked easily and was sensitive to temperature changes. So Nikon created ED glass, which offers all the benefits, but none of the drawbacks of calcium fluorite-based glass. ED glass is now an essential element in NIKKOR’s telephoto lenses, helping deliver stunning sharpness and contrast, even at maximum aperture.

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