The climate in Arizona is conducive to the growth of cacti, and the Phoenix Botanical Gardens have a great variety of them. I found that a good way of highlighting the needles on cacti is by photographing them when they are back-lit, preferably against the sky for a plain background. That kind of light exists in the morning or evening with the low angle of the sun at those times of the day. Metering is tricky, but measuring the brightness of the needles with a spot meter and placing the measurement on zone 7 or so is just about right. (Thanks, Ansel.)
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