viernes, octubre 05, 2007

Twelve Essential Photographic Rules

Twelve Essential Photographic Rules
From Sunny 16 to Moony 11, 8, and 5.6, these facts, formulas, and
photographic rules can get you out of a jam and help you get good shots when
nothing else will.
By Jason Schneider
September 2007

What happens when your systems go belly-up, when all of that cutting-edge
technology dies and you must rely on (gasp!) your own knowledge? It pays to
have these basics in your head. They can get you out of a jam and help you
get good shots when nothing else will.
1. Sunny 16 Rule
The basic exposure for an average scene taken on a bright, sunny day is f/16
at a shutter speed equivalent to one over the ISO setting-that is, f/16 at
1/100 sec at ISO 100. From this you can interpolate, and try f/22 at the
beach, f/11 on a cloudy-bright day, etc.
2. Moony 11, 8, and 5.6 Rules
There are many different rules that work well when shooting the moon. One
favorite for a proper exposure of a full moon is f/11 at one over the ISO
setting. For pictures of a half moon, use the same shutter speed at f/8, and
for a quarter moon, use the same shutter speed at f/5.6.
3. Camera Shake Rule
The slowest shutter speed at which you can safely handhold a camera is one
over the focal length of the lens in use. As shutter speeds get slower,
camera shake is likely to result in an increasing loss of sharpness. So, if
you're using a 50mm lens, shoot at 1/60 sec or faster. Not enough light? Use
a flash, tripod, or brace your camera against a solid object.
4. Anatomical Gray Card
Metering off an 18-percent neutral gray card is a good way to get a midtone
reading that will give you a good overall exposure of a scene. Forgot your
gray card? Hold your open hand up so it's facing the light, take a reading
off your palm, open up one stop, and shoot. (Various skin tones rarely
account for even a full-stop difference.)
5. Depth of Field Rules
When focusing on a deep subject, focus on a point about a third of the way
into the picture to maximize depth of field, because the depth-of-field zone
behind that point is about twice as deep as the depth-of-field zone in front
of it. This works for all apertures and focal lengths, but the smaller the
aperture and the shorter the focal length, and the greater the distance you
shoot at, the greater the depth of field.
6. Largest Digital Print Rule
To calculate in inches the largest photo-quality print you can make with a
digital camera, divide the vertical and horizontal pixel counts (see your
manual) by 200. For critical applications, or if you want exhibition-quality
prints, divide the pixel counts by 250.
7. Exposure Rules
The classic advice is, "Expose for the highlights, and let the shadows take
care of themselves." This works with slide film and digital. But with
negative film, especially color negative, you're better off overexposing by
one stop.
8. Quick Flash-fill Rule
When using an automatic flash unit that doesn't provide auto flash-fill
ratios, set the flash's ISO dial to twice the ISO you're using. Meter the
scene, select an f-stop, set the autoflash aperture to the same f-stop, and
shoot. The resulting 2:1 flash-fill ratio will produce filled shadows one
stop darker than the main subject.
9. Flash Range Rule
Want to know how much extra flash range you get by going to a faster ISO?
The rule is, "Double the distance, four times the speed." For example: If
your flash is good to 20 feet at ISO 100 (film or digital), it will be good
to 40 feet at ISO 400.
10. Megapixel Multiplier Rule
To double the resolution in a digital camera, you must increase the number
of megapixels by a factor of four-not two. Why? The number of pixels in both
the vertical and horizontal dimensions must be doubled to double the pixel
density across the image sensor.
11. Action-stopping Rules
To stop action moving across the frame that's perpendicular to the lens
axis, you need shutter speeds two stops faster than action moving toward or
away from you. For action moving at a 45-degree angle to the lens axis, you
can use a shutter speed one stop slower. For example: If a person running
toward you at moderate speed can be stopped at 1/125 sec, you'll need a
shutter speed of 1/500 sec to stop the subject moving across the frame, and
a shutter speed of 1/250 sec to stop him if moving obliquely with respect to
the camera.
12. Sunset Rule
To get a properly exposed sunset, meter the area directly above the sun
(without including the sun). If you want the scene to look like it's a
half-hour later, stop down by one f-stop, or set exposure compensation to
minus one.

Taken from here
Originally published November, 2004.

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