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What kind of lens do I need? |
Lens quality also has an important influence on the image quality -
there is little point in having a high-resolution digital conversion of
an unsharp optical image. Lens quality can only really be assessed by
practical tests, but the better-known camera and lens makers - Nikon,
Nikon, Olympus, Konica Minolta, Pentax, Leitz as well as Sigma, Tamron,
Tokina and others - can generally be relied on to produce good quality.
Fixed focal length lenses
These lenses offer no optical zoom. Look for autofocus instead of fixed
focus, as well as selectable macro and landscape focus modes.
Retractable zoom lenses
These zoom lenses retract into the camera body when the camera is off and extend when it's on.
Interchangeable lenses
Digital SLRs use interchangeable lens systems, which means that you can
detach the entire lens from the camera body and replace it with any
other compatible lens.
What a Zoom Lens Can Do For You?
Most people think of a zoom lens as a tool for getting closer to your
subject. It is. However, it can be used for so much more. The real
benefit of using a zoom lens is the speed and ease with which you can
recompose your picture.
What a Fixed Lens Can Do For You?
Fixed-focal length lenses will give, in theory at least, the sharpest
results. This makes sense; if you want the least distortion, etc., you
want to have the least amount of glass between you and your subject. A
zoom lenses usually consists of a great number of different elements
while a fixed will have few.
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