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“the f-number (sometimes called focal ratio, f-ratio, or relative aperture[1]) of an optical system expresses the diameter of the entrance pupil in terms of the effective focal length of the lens. It is the quantitative measure of lens speed, an important concept in photography” – Wikipedia In other words, the f-stop is the ratio of lens focal length to the effective aperture open diameter. Each f-s

This was a huge week for environmental news. U.S. Supreme Court Rules in its first case on climate change, that carbon dioxide and other greenhouse gases are air pollutants under the Clean Air Act —– U.S. Supreme Court deals a setback to the utility industry, supporting a Clinton era, federal clean air initiative aimed at forcing power companies to install pollution control equipment on aging coal-fired p

“Aperture is a hole or an opening through which light is admitted or more specifically in photography how wide open the shutter remains when the shutter is released.” – Wikipedia The ratio of the lens focal length to the effective aperture provides the f/stop value. (see Photo Term Series Post #6: f-stop, f/stop or f-number) [tags]aperture, f-stop, f/stop, photography, term, photo, terminology[/tags

A breaking storm at sunset in Yosemite National Park this past week provided a wide variety of conditions to photograph. After patiently watching and photographing the unfolding light show Mother Nature threw one more surprise at the few remaining die-hard photographers enduring the cold. Just as the day looked to be over one last channel opened in the clouds. The result was a perfect spotlight of red sun light paint

One of the most frequently asked questions by those that are interested in selling photos is “What are my photos worth?” Pricing is always a challenge. One thing is certain… price varies depending on the type of sale you’re pursuing (stock, fine art, etc.) and a variety of cascading options. For fine art photography the process is a subjective one based on your interpretation of the market, un

For this term I’ll quote Merriam-Webster’s definition: Diptych 1 : a 2-leaved hinged tablet folding together to protect writing on its waxed surfaces 2 : a picture or series of pictures (as an altarpiece) painted or carved on two hinged tablets 3 : a work made up of two matching parts A Triptych would be the same, but with three matching or related parts.

Surely one would think the locals would get tired of the view in Yosemite, but on this very cold morning that didn’t seem to be the case. Perched from a lookout I spied a pair of ravens in a much better position to enjoy the distant view of Bridal Veil Fall. All components of this image have been compressed together by using a very long focal length (1200mm) providing an illusion that I was very close to both t

I’m not much for contests, but the prospect of photographing Polar Bears has me in a contrarian mood. For those with extra time the Viewers Choice voting ends tonight for Outdoor Photographers “Vanishing Treasures” photo contest. The gallery site is super slow today but you can access my images directly below and vote for them if you’re in a generous mood. My stuff is buried Lanscape photos of

This past Tuesday, March 27th, I was in Yosemite likely during the last snowfall of the year. I’ve been to Yosemite numerous times, but never during a snow storm. It was an incredible experience. The valley looks infinitely more dramatic with fresh snow. This beauty was fleeting though and much of this snow melted the following day. It’s no wonder with such fleeting beauty that so many people strive to ca