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Photo of the Week - January 24, 2014

on January 24, 2014

Female Greater Scaup

Swimming on Capitol Lake at Dusk

Aythya marila

Olympia, WA

January 24, 2014

Aythya marila Bird Capitol Lake Duck Dusk Female Greater Scaup Olympia Photo of the Week Reflection Swim swimming Washington Winter

Location: Capitol Lake, Olympia, WA 98502, USA

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Examples of the effect of different shutter speeds on the crispness & detail of the moon; and, the relationship between the moon & a light cloud layer.

Full Moon rises over Mount Rainier at Sunset

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Mirror Slap and Camera Vibration at Slow Speeds

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December 21, 2016 - Surf Scoter about to eat a whole clam

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What does the f in f-stop stand for?

The f in f-stop stands for "focal length". Focal length is the length of a lens (18mm, 50mm, 200mm, etc.) The notation f/4 is a shorthand notation for the diameter of a lens opening, where focal length is divided by 4. F-stops show a ratio of the relationship of focal length to lens opening. Here is Ansel Adam's explanation, from his book, The Camera : “The lens aperture is simply the diameter of the lens opening, expressed as a fraction of its focal length. Thus a lens of 4-inch focal length with a diameter of one inch has a relative aperture of 4/1, or 4. The aperture designation is expressed as f/4, indicating that the aperture is the focal length/4. Another 4-inch lens that has a diameter of 1/2 inch would be an f/8 lens.” Adams, Ansel. The Camera . Boston: New York Graphic Society, 1980: 46. Some examples: A 200mm lens whose aperture diameter is 50mm has an f-stop of f/4 200/50 = 4 A 200mm lens whose aperture diameter is 25mm has an f-stop of f/8 200/25...

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