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Physics, Facts, and Freedom: Why Less Can Be More

Terry A. McDonald, luxBorealis.com
Effective aperture and shutter speed
Despite the disinformation regarding aperture, depth-of-field and exposure scattered around the web, physics tells us that ƒ8 on a M43 lens has the equivalent depth of field of ƒ16 on a full-frame lens of equivalent field of view (efov), the M43 bonus being a shutter speed 2EV faster. Let’s go back to that landscape: given the same ISO, a M43 exposure of ƒ8 at 1/125 produces the identical result in terms of depth of field and exposure as a full frame shot of ƒ16 at 1/30. To me, having that 2EV faster shutter speed means less time waiting for that @#%$! wind to die down. Combined with industry-leading stabilization (see below), it also allows for more flexibility with hand holding the camera.

Dörlinbach at Dusk, Black Forest, Germany. OM-1 w/12-100mm at 23mm (46mm efov); ƒ5.6 @ 1second, hand held, ISO 3200; raw file processing DxO PureRaw and Lightroom. With full-frame, this would have required a 4 second exposure ...

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Terry McDonald is an artist, author and educator, working in fine art landscape and nature photography. He approaches photography as both an art and a craft: a solid grounding in technique frees him to explore a variety of visual styles. As a photographer his goal seems simple enough: capture and recreate the inherent art in nature. However, nature is not always so accommodating! Although Terry grew up and has lived most his life in Canada, he has lived, worked and photographed overseas for 10 years in Tanzania, Germany and, more recently, England. Additional travel destinations have included much of western Europe, across Canada to two of three coats, South Africa, south Florida, the Galápagos and Iceland. Terry lives with his family in Guelph, Ontario, his home base for hiking, backcountry canoeing and nordic skiing. When time permits, he offers classroom and field workshops throughout the year. Terry’s work has been featured in Photo Life and Light & Landscape and is in private collections on three continents. His work may be viewed at luxBorealis.com or at his luxBorealis Flickr account.
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