Sony a Lenses - Manual (Page 22)

Telephoto zoom
70–200mm F2.8 G SAL70200G
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
some significant photographic advantages, and the outstanding clarity and
contrast offered by the SAL70200G multiplies those advantages many times
over. Although the large F2.8 maximum aperture does make it easier to
create beautifully defocused backgrounds, there are important advantages
for shooting moving subjects as well. Larger apertures—often referred to as
“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
up as a blur with a slower lens. The SAL70200G does it all with characteristic
G Lens refinement and class.
• Weight (approx): 1340 g
• Dimensions (Dia. x L): 87 x 196.5 mm
• Max. magnification ratio: 0.21x
• Tripod mount supplied
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
100
80
60
40
20
0 4 8 12 16 20
Contrast
(%)
Contrast (%)
100
80
60
40
20
0 4 8 12 16 20
Distance from center of image (mm) Distance from center of image (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
Telephoto zoom
70–300mm F4.5–5.6 G SSM SAL70300G
The SAL70300G is the smallest and lightest zoom in the current G Lens series,
offering an appealing combination of extended zoom range and handling,
plus image quality that will satisfy the most demanding photo enthusiast or
pro. An ED lens element collaborates with an advanced optical path design
to achieve exceptionally low aberration right out to the maximum 300mm
focal length, so that your telephoto images benefit from impressive clarity
and depth. 300mm is generally considered to be the point at which the
“medium” telephoto range ends and the “super” telephoto range begins.
Long focal lengths like this require careful handling to prevent camera shake,
but SteadyShot INSIDE™ image stabilization featured in a series bodies
will help you capture clear, blur-free images in a wider range of handheld
shooting situations than would normally be possible.
• Weight (approx): 760 g
• Dimensions (Dia. x L): 82.5 x 135.5 mm
• Max. magnification ratio: 0.25x
• Tripod mount supplied
One ED glass element contributes to minimal aberration
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
100
80
60
40
20
0 4 8 12 16 20
Contrast
(%)
Contrast (%)
100
80
60
40
20
0 4 8 12 16 20
Distance from center of image (mm) Distance from center of image (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 70 mm At 300 mm
ED glass
A mode, 1/60 sec., F11, ISO 100, Daylight white balance A mode, 1/400 sec., F13, ISO 400, Auto white balance; Photo: Mark Tiller
42 43