Sony a Lenses - Manual (Page 15)

Telephoto zoom
DT 55–300mm F4.5–5.6 SAM SAL55300
Get a superb all-purpose telephoto zoom lens at a great value with the
Sony SAL55300 55-300mm f/4.5-5.6 lens. An excellent all-around addition
to your kit, this lens covers the medium- to long-distance telephoto range
used most often by family photographers. It also provides close minimum
focusing distance of about 4.5 feet (1.4m) ideal for tight shots of people,
natural subjects and close-up details. Its compact, lightweight design
makes it easy to carry as your standard or accessory lens. All your shots
will benefit from the Sony Super SteadyShot
® image stabilization system
built into your Sony Alpha DSLR camera. (35mm equivalent: 82.5-450mm)
• Weight (approx): 460 g
• Dimensions (Dia. x L): 77 x 116.5 mm
• Max. magnification ratio: 0.27x
Compact, lightweight design
Superb value and performance
Zoom range: 55-300 mm
4.5 (1.4 m) minimum focus
ED Glass for sharp imaging
Fixed focal length lenses, commonly known as "prime lens"
or simply as "primes," can complement your photographic
vision in a number of ways. Although most of the focal
lengths offered are also available with zoom lenses, some
special-purpose lenses are only available as primes: fisheye
lenses and most true macro lenses are examples. And
since the optical path only needs to work at one focal length, it can be optimized to deliver a level of optical
performance that is a cut above the average zoom. But
many photographers like working with a fixed focal length
simply because it always gives them the same angle of view
and perspective, making it easier to pre-visualize what the
camera will see and thus providing the most consistent,
intuitive shooting experience.
Fixed Focal Length Lenses
ED glass
100
80
60
40
20
0 3 6 9 12
Contrast
(%)
100
80
60
40
20
0 3 6 9 12
Contrast
(%)
Distance from optical center
of lens (mm) Distance from optical center
of lens (mm)
Spatial frequency
10 line pairs/mm
30 line pairs/mm
R: Radial values T: Tangential values
Max. aperture
R R T T
F8 aperture
At 55 mm At 200 mm
M Mode, 1/200 sec., F8.0, ISO 200, Sunny white balance
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