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Tag: Jack Howard
03.02.2015

Introducing Sigma Vision magazine!

© 2015 Liam Doran
This morning sun rises over the San Juan Mountains
of southwest Colorado bathing the deep snow on Coal Bank Pass in low angle light. I spent two days
skiing and shooting with local pro skier Sven Brunso. His knowledge of the area is extensive and was
critical in helping us capture some amazing shots.
Sigma 24-105mm F4 DG OS HSM lens on a Canon

Welcome to the premiere issue of Sigma Vision, the new biannual magazine from Sigma Corporation of America, featuring inspiring imagery and great technical advice!

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10.06.2014

Taking Creative Control: Understanding Aperture and F/Stops

These two apples were photographed with the Sigma 18-35mm F1.8 DC HSM | A lens zoomed to 35mm with an F2.8 aperture for shallow depth of field. Notice how just a sliver of the leaf and near apple is on the focal plane. The front apple is about a foot from the lens, with the farther apple nine inches behind. The back wall with the very soft shadow is ten feet from the camera.  1/40 F2.8 ISO 400, continuous lighting.

Of the three main variables relating to creative and artistic control on DSLR and compact interchangeable cameras–aperture, shutter speed and ISO– aperture control, is for many beginners, the most difficult to grasp. Have no fear, we’re here to help. Learning how and when to select a wide or narrow aperture unleashes the creative and expressive potential of your camera’s lenses.

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05.28.2014

First Look: Sigma 50mm F1.4 DG HSM | A

Daffodils, captured wide open at F1.4 with the new Sigma 50mm F1.4 DG HSM | A lens on a classic 5D. 1/5000 F1.4 ISO 100.

The Sigma 50mm F1.4 DG HSM | A lens is simply amazing. This standard field of view, fast-aperture, full-frame, prime lens combines outstanding sharpness, fast autofocus, in a lens that is built with a singular vision on performance.

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03.03.2014

What is a Zoom Lens? And why and when to choose a Zoom Lens?

Sigma offers a great variety of zoom lenses. (Lenses are not shown to scale in this display.)

A zoom lens is a type of camera lens that is offers the photographer a useful range of different focal lengths in a single lens. This is in comparison to a prime lens, which only offers a single focal length. A zoom lens allows for quick and easy re-framing of a scene while staying in the same physical position. Sigma offers a line of over 20 zoom lenses for DSLR photographers, ranging from wide angle zoom lenses, supertelephoto zoom lenses, and high-zoom ratio all-in-one lenses for both full-frame (DG) and APS-C (DC) digital cameras.

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09.30.2013

Chasing Fall Color with the Sigma 18-35mm F1.8 DC HSM | Art Lens

Exploring the world through the Sigma 18-35mm F1.8 DC HSM | Art lens on the hunt for varying colors and textures, and levels sharpness and blur can create images that are at once new, and yet instantly recognizable. Close-up focusing on a pumpkin, for example, gives a shallow slice of sharpness, and lovely focus fall-off in a composition that’s pure seasonal color. And a single turning leaf backlit by the sun tells the story of autumn in a very different way than a sweeping vista of an entire hillside.

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