Sony SLT-A57K Instruction Manual - Page 88

On focal length, Name Model name

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Specifications Lens Name (Model name) Equivalent 35mmformat focal length* (mm) DT 18-55mm F3.5-5.6 SAM DT 55-200mm F4-5.6 SAM (SAL1855) (SAL55200-2) 27-82.5 82.5-300 Lens groups-elements Angle of view* 7-8 76°-29° 9-13 29°-8° Minimum focus** (m (feet)) 0.25 (0.82) 0.95 (3.2) Maximum magnification (X) 0.34 0.29 Minimum f-stop Filter diameter (mm) Dimensions (maximum diameter × height) (approx., mm (in.)) f/22-36 55 69.5×69 (2 3/4 × 2 3/4) f/32-45 55 71.5×85 (2 7/8 × 3 3/8) Mass (approx., g (oz.)) 210 (7 4/8) 305 (10 3/4) * The values for equivalent 35mm-format focal length and angle of view are based on Interchangeable Lens Digital Camera equipped with an APS-C sized image sensor. ** Minimum focus is the shortest distance from the image sensor to the subject. • This lens is equipped with a distance encoder. The distance encoder allows more accurate measurement (ADI) by using a flash for ADI. • Depending on the lens mechanism, the focal length may change with any change of the shooting distance. The focal length assumes the lens is focused at infinity. • The infinity position provides for some adjustment to compensate for focus shift caused by change in temperature. To shoot a subject at infinite distance in MF mode, use the viewfinder and set focus. On focal length The picture angle of this camera is narrower than that of a 35 mm-format camera. You can find the approximate equivalent of the focal length of a 35 mmformat camera, and shoot with the same picture angle, by increasing the focal length of your lens by half. 88

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Specifications
88
*
The values for equivalent 35mm-format focal length and angle of view are based
on Interchangeable Lens Digital Camera equipped with an APS-C sized image
sensor.
** Minimum focus is the shortest distance from the image sensor to the subject.
• This lens is equipped with a distance encoder. The distance encoder allows more
accurate measurement (ADI) by using a flash for ADI.
• Depending on the lens mechanism, the focal length may change with any change of
the shooting distance. The focal length assumes the lens is focused at infinity.
• The infinity position provides for some adjustment to compensate for focus shift
caused by change in temperature. To shoot a subject at infinite distance in MF mode,
use the viewfinder and set focus.
On focal length
The picture angle of this camera is narrower than that of a 35 mm-format
camera. You can find the approximate equivalent of the focal length of a 35 mm-
format camera, and shoot with the same picture angle, by increasing the focal
length of your lens by half.
Lens
Name (Model name)
DT 18-55mm F3.5-5.6 SAM
(SAL1855)
DT 55-200mm F4-5.6 SAM
(SAL55200-2)
Equivalent 35mm-
format focal length
*
(mm)
27–82.5
82.5–300
Lens groups-elements
7–8
9–13
Angle of view
*
76°-29°
29°-8°
Minimum focus
**
(m
(feet))
0.25 (0.82)
0.95 (3.2)
Maximum
magnification (X)
0.34
0.29
Minimum f-stop
f/22-36
f/32-45
Filter diameter (mm)
55
55
Dimensions (maximum
diameter × height)
(approx., mm (in.))
69.5×69
(2 3/4 × 2 3/4)
71.5×85
(2 7/8 × 3 3/8)
Mass (approx., g (oz.))
210 (7 4/8)
305 (10 3/4)