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Laguna Verde, Bolivia
Phase One A-Series 150MP, 23mm Alpagon lens, f11 @ 1/125 second, ISO 50

That green is real! And it's not very nice. Laguna Verde up on Bolivia's dramatic Altiplano is full of arsenic and hence, I'm told, its green colour. Laguna Blanca just next door is blue and the flamingos happily wade there, but not in Laguna Verde.

When we arrived, low cloud was skirting the Licancabur volcano on the Chilean border and the wind was howling, creating an acrid spume on the shore. It made a great foreground, although it left the legs of my tripod covered in a salty residue! The technique used to capture this image is a combination of focus stacking and a time exposure.

To ensure the foreground and background are tack sharp, I focused on four points in the foreground (the bottom half of the image), with an aperture of f11 so there's already a lot of depth-of-field keeping things sharp. I then focused on infinity and took a safety shot at the same exposure, but then switched into time exposure mode. On the Phase One IQ4, it's the exposure averaging feature, but you can achieve the same result with a neutral density filter. The exposure is the equivalent of 15 seconds for this one, although I experimented. As the clouds were moving so quickly, I didn't need such a long exposure to achieve a suitable blur.

It's interesting to note how with changes in technology, new ways of shooting are opening up, but at the end of the day, we still need a strong, simple compositions - at least, that's my view!

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