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Sony SAL1870 - Zoom Lens - 18 mm セレクション・マニュアル
Sony
Lenses
®
The large-aperture G Lens series brings together a wealth of
advanced technology to provide you with an exceptionally
refined level of optical performance. Its aspherical lens
elements improve lens performance; ED (Extra-low Dispersion)
glass minimizes the chromatic aberrations that occur at large
apertures; and the circular aperture makes smooth, beautiful
defocusing possible. The resulting difference in quality is clear
to see... and clearly breathtaking.
16
16
Sony G Lenses
SAL35F14G
35mm F1.4 G
•
Lens groups/elements: 8/10
•
Minimum focus: 11-13/16" (0.3 m)
•
Filter diameter: mm
•
Size: (diameter x length): 2-3/ x 3"
(69 x 76 mm)
Aspherical lens
•
Weight: 1 lb 2 oz (10 g)
Fast wide-angle lens with superior image quality at wide
apertures thanks to glass-molded aspheric lens elements.
Achieves high resolution and high contrast from corner to
corner, with shallow depth of field also possible because
of the large maximum aperture. This unique lens gives a
special touch to portraits and landscapes, and is ideal for
handheld shooting. For comfortable handling, includes a
focus hold button and a focus ring that does not rotate
during AF operation.
Icons:
Circular aperture
Internal focusing
Focus Hold Button
Focus Range limiter
• For details, please refer to the
SAL3F1G (3mm F1. G)
Modulation Transfer
Function (MTF)
MTF is a measurement of how well a lens
can reproduce fine details at a high level
of contrast. The curves below show lens
performance at two levels of spatial frequency
(10 or 30 line pairs/mm) for two types of
targets (radial R, tangential T). Performance is
measured at two settings: open and F8.
For each condition, contrast level changes at
various points away from the center of
the image.
MTF
100
80
60
0
20
0
8
12
16
20
Distance from center of image (mm)
Open
R10 line pairs/mm
R30 line pairs/mm
T10 line pairs/mm
T30 line pairs/mm
F8
R10 line pairs/mm
R30 line pairs/mm
T10 line pairs/mm
T30 line pairs/mm
(R: radial target, T: tangential target)
ADI flash metering
SSM (Super sonic wave motor)
17
Lens Technology section on p.26–28.