Sony SLT-A57M Specifications - Page 21
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G Lenses
Sony G Lenses are an exceptional breed. They inherit a
distinguished pedigree from the original Minolta
®
lens line,
with industry-leading Sony design and quality assurance
technology added to push their performance to the forefront
of twenty-first century photography. G Lenses impart a visual
elegance to every aspect of the images they produce:
extraordinary presence at in-focus areas, smoothly dissolving
to luscious out-of-focus rendering that can provide a beautiful
foundation for captivating photographic art. Their handling is
extraordinary too, with intimate operation and response that
seamlessly connect the process of taking photographs to the
photographer's imagination.
Telephoto zoom
70–200mm F2.8 G SAL70200G
Four ED glass elements effectively suppress aberration
Constant F2.8 maximum aperture
Outstanding sharpness and contrast throughout the zoom range
SSM (Super Sonic wave Motor) for fast, quiet autofocus operation
Circular aperture for attractive defocusing
Focus hold and focus range switches offer precision focusing control
ED glass
At 70 mm
At 200 mm
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The range from 70 to 200 millimeters is where much of the telephoto action
occurs. The ability to cover that range with a constant F2.8 aperture affords
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some significant photographic advantages, and the outstanding clarity and
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contrast offered by the SAL70200G multiplies those advantages many times
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over. Although the large F2.8 maximum aperture does make it easier to
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create beautifully defocused backgrounds, there are important advantages
for shooting moving subjects as well. Larger apertures—often referred to as
0
4
8
12
16
20
0
4
8
12
16
20
Distance from center of image (mm)
Distance from center of image (mm)
"fast" as well as "bright"—allow you to use faster shutter speeds to achieve
equivalent exposure, making it possible to capture motion that might end
Max. aperture
F8 aperture
Spatial frequency
R
T
R
T
up as a blur with a slower lens. The SAL70200G does it all with characteristic
10 line pairs/mm
G Lens refinement and class.
30 line pairs/mm
R: Radial values T: Tangential values
• Weight (approx): 1340 g
• Dimensions (Dia. x L): 87 x 196.5 mm
• Max. magnification ratio: 0.21x
• Tripod mount supplied
A mode, 1/60 sec., F11, ISO 100, Daylight white balance
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