Mainstream compacts
are too big to pocket, but small enough for most handbags and glove
boxe. The ones we tested recently weigh 7 to 14 ounces. Price: $140
to $480.
More serious cameras have
the versatility and power to capture fast action or create
photographic art under the most demanding light conditions. Advanced
compact cameras are typically larger and heavier than compacts,
with versatile controls and long zoom lenses. Price: $280 to $850.
Super-zoom cameras
are characterized by a very long zoom range 10x or greater. While
traditionally larger and heavier than compacts, a few new models are
designed to be smaller and lighter than older models. Price: $250 to
$700.
SLRs (single-lens
reflex), the largest and heaviest type, offer the most versatility
and power, including interchangeable lenses. Price: $600 to $1,700
for consumer models; professional models can cost thousands.
FEATURES THAT COUNT
Digital cameras are
distinguished by their resolution how many pixels, or
picture elements, the image sensor contains. One megapixel equals 1
million picture elements. A 4-megapixel camera can make excellent
8x10s and pleasing 11x14s. There are also 5- to 10-megapixel models,
including point-and-shoot ones. These are well-suited for making
larger prints or for maintaining sharpness if you want to use only a
portion of the original image. Professional digital cameras use as
many as 16 megapixels. Price: $100 to $400 for 4 megapixels; $150 to
$500 for 5 and 6 megapixels; $300 to $1,000 for 7- to 10-megapixel
point-and-shoot models, and up to $1,700 for 10-megapixel SLRs.
Most digital cameras are
highly automated, with features such as automatic exposure control
(which manages the shutter speed, aperture, or both according to
available light) and autofocus.
Instead of film, digital
cameras record their shots on flash-memory cards. Compact
Flash (CF) and SecureDigital (SD) are the most widely used. Once
quite expensive, these cards have tumbled in price a 256-megabyte
card can now cost less than $20. Other types of memory cards used by
cameras include MemoryStick Duo and xD.
To save images, you
transfer them to a computer, typically by connecting the camera to
the computer's USB or FireWire port, or inserting the memory card
into a special reader. Some printers can take memory cards and make
prints without putting the images on a computer first. Image-handling
software, such as Adobe Photoshop Elements, Jasc Paint Shop,
Microsoft Picture It, and ACDSee, lets you resize, touch up, and crop
digital images using your computer. Most digital cameras work with
both Windows and Macintosh machines.
The file format commonly
used for photos is JPEG, which is a compressed format. Some
cameras can save photos in the uncompressed TIFF format, but this
setting yields enormous files. Other high-end cameras have a RAW file
format, which yields the image data with no processing from the
camera and can also be uncompressed.
The optical viewfinder is
becoming increasingly rare, replaced by larger color LCD monitors.
(Some are now as large as 3 inches.) Monitors are very accurate in
framing the actual image you get better than most optical
viewfinders but might be hard to view in bright sunlight. You can
also view shots you've already taken on the LCD monitor. Many
digital cameras provide a video output, so you can view your pictures
on a TV set.
Many new models let you
capture video and sound. Some let you record video in
high-quality MPEG4 format, up to 30 frames per second, up to the
memory card's capacity.
A zoom lens provides
flexibility in framing shots and closes the distance between you and
your subject ideal if you want to quickly switch to a close shot.
The typical 3x zoom on mainstream cameras goes from a moderately
wide-angle view (35 mm) to moderate telephoto (105 mm). You can find
cameras with extended zoom ranges between 8x and 15x, giving added
versatility for outdoor photography. Other new cameras go down to 24
or 28 mm at the wide-angle end, making it easier to take in an entire
scene in close quarters, such as a crowded party.
Optical zooms are
superior to digital zooms, which merely magnify the center of the
frame without actually increasing picture detail, resulting in a
somewhat coarser view.
Sensors in digital
cameras are typically about as light sensitive as ISO 100 film,
though many let you increase that setting. (At ISO 100, you'll
probably need to use a flash indoors and in low outdoor light.) A
camera's flash range tells you how far from the camera the
flash will provide proper exposure. If the subject is out of range,
you'll know to close the distance. But digital cameras can tolerate
some underexposure before the image suffers noticeably.
Red-eye reduction
shines a light toward your subject just before the main flash. (A
camera whose flash unit is farther from the lens reduces the risk of
red eye. Computer editing of the image may also correct red eye.)
With automatic flash mode, the camera fires the flash whenever
the light entering the camera registers as insufficient. A few new
cameras have built-in red-eye correction capability.
Some cameras with large
LCDs, and some with powerful telephoto lenses, now come with some
form of image stabilizer. (Optical-image stabilizers are the
best type; some cameras use simulated stabilization to try to achieve
the same effect.) Stabilizers compensate for handheld camera shake,
letting you use a slower shutter speed than you otherwise could for
following movement. But an image stabilizer won't compensate for
the motion of subjects.
Most new 6- to
10-megapixel cameras come with full manual controls, including
independent controls for shutter and aperture. That gives serious
shutterbugs control over depth of field, shooting action, or shooting
scenes with tricky lighting.
HOW TO CHOOSE
The first step is to
determine how you will use the camera most of the time. Consider
these two questions:
How much flexibility
to enlarge images do you need? If you mainly want to make 4x6
snapshots, a camera with 4- or 5-megapixel resolution should be fine.
It will also make an 8x10 print of an entire image without alteration
that won't look much different than one from a 6- or 8-megapixel
model. But to enlarge the image more or enlarge only part of it,
you'll want a camera with resolution of 6 megapixels or greater.
How much control do
you want over exposure and composition? Cameras meant for
automatic point-and-shoot photos, with a 3x zoom lens, will serve
casual shooters as well as dedicated hobbyists much of the time. The
full-featured cameras in the advanced compact and super-zoom
categories offer capabilities that more-dedicated photographers will
want to have. Two of the more important capabilities are a zoom range
of 5x to 10x or more, which lets you bring distant outdoor subjects
close and also lets you shoot candid portraits without getting right
in your subject's face, and a full complement of manual controls
that let you determine the shutter speed and lens opening.
Once you've established
the performance priorities that you need from a camera, you can
narrow your choices further by considering these convenience factors:
Size and weight.
The smallest, lightest models aren't necessarily inexpensive
4-megapixel cameras. And the biggest and heaviest aren't
necessarily found at the high end. If possible, try cameras at the
store before you buy. That way, you'll know which one fits your
hand best and which can be securely gripped. In our tests, we found
that some of the smallest don't leave much room even for small
fingers.
Battery type and life.
All digital cameras run on rechargeable batteries, either an
expensive battery pack or a set of AAs. In our tests, neither type
had a clear performance advantage. The best-performing cameras offer
at least 250 shots on a charge, while the worst manage under 100. We
think it's more convenient to own a camera that accepts AA
batteries. You can buy economical, rechargeable cells (plus a
charger) and drop in a set of disposable lithium or alkaline
batteries if the rechargeables run down in the middle of shooting.
Camera speed. With
point-and-shoot cameras like the ones we tested, you must wait after
each shot as the camera processes the image. Most models let you
shoot an image every few seconds, but a few make you wait 5 seconds
or more. They may frustrate you when you're taking photos of a
subject that is very active, such as a child.
Your other cameras.
If you own a film camera with interchangeable lenses, you can
probably use those lenses on digital SLRs of the same brand. Some new
Olympus digital SLRs require a special $100 adapter to use film
lenses, but you'll only be able to focus those lenses manually.
Copyright © 2003-2007
Consumers Union of U.S., Inc.
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