Product Description
High-resolution advanced optical design
A new optical design that adheres to demanding G Master standards places XA
(extreme aspherical), Super ED (extra-low dispersion), and ED glass elements in
the front group to effectively suppress all common telephoto lens aberrations,
while a floating focus system works with these correction measures to ensure
that the highest possible resolution is maintained from center to periphery of
the image edge throughout the lenss focus range.
G Master
Bokeh
The extremely high surface precision of the XA (extreme aspherical) elements
carefully control spherical aberration, combining with an 11-blade circular
aperture mechanism to produce spectacularly smooth and elegant G Master bokeh
that maximizes the creative potential of the narrow depth of field available
with this 135mm F1.8 lens.
XA
(Extreme aspherical) element for high resolution and soft bokeh
The extremely precise XA (extreme aspherical) lens element, with better
than0.01-micron surface precision, reduces aberration and delivers the ultimate
resolution throughout the entire focus and aperture ranges. Using newly
developed bokeh simulation techniques, spherical aberration and unsightly onion
ring bokeh can be minimized during both design and manufacture of the
large-diameter XA lens element, resulting in exquisitely soft and smooth bokeh.
Super ED
and ED glass elements
One Super ED (extra-low dispersion) glass element and one ED glass element are
strategically positioned to compensate for axial chromatic aberration that is
often a problem in large-aperture telephoto lenses, achieving impressive
sharpness. In addition to improving resolution, this configuration minimizes
color fringing that can occur in background and foreground bokeh.
11-blade
circular aperture contributes to gorgeous bokeh
The 11-blade circular aperture mechanism maximizes the beauty of this
large-aperture prime lens, contributing to impressive images in which the
subject stands out against a smoothly defocused foreground and background,
producing the large, perfectly round points of defocused light (bokeh) that is a
desirable characteristic of telephoto lenses, even when stopped down by one or
two stops. Soft, natural bokeh provides a beautiful backdrop for the main
subject, especially in portraits.
Four XD
linear motors for AF speed
Four innovative XD (extreme dynamic) linear focus motors drive two precisely
synchronized focus groups in a floating focus mechanism, offering outstanding
speed, precision and tracking that contribute directly to fast, precise, quiet
AF operation with low vibration. This also prevents aberration variations that
can occur as the camera-to-subject distance changes, maintaining optimum
resolution throughout the lenses focus range. The cameras speed potential is
put to full use to capture decisive moments in dynamic portraits, sports, and
other action scenes with impressive speed, precision, and reliability.
Nano AR
coating suppresses reflections, flare and ghosting
Sonys original Nano AR Coating technology minimizes flare and ghosting, for
dynamic range that achieves lifelike detail and gradation with advanced camera
sensors. This precisely defined regular nano-structure allows accurate light
transmission, contributing to high-quality images. The reflection suppression
characteristic of the Nano AR Coating is superior to conventional
anti-reflective coatings, providing a notable improvement in clarity, contrast,
and overall image quality.
Close
focus
An advanced floating focus mechanism prevents aberration variations that can
occur as the focusing distance changes, providing a minimum focus distance of
just 27.5 (0.7 meters) and a maximum magnification of 0.25x for impressive
close-up capability. High resolution and exquisite G Master bokeh are maintained
even in close-up shots.
Manual
aperture ring with switchable click stops
A manual aperture ring provides the responsive control required for professional
still and movie shooting. Click stops can be switched on for tactile feedback
that tells the user how many stops the ring has been rotated when shooting
stills, or OFF for seamless, silent aperture control when shooting movies. The
focus ring features Linear Response MF (manual focus) that responds directly to
focus ring rotation and feels similar to mechanically coupled systems, allowing
precise control and instantaneous response when focusing manually for stills or
movies.
Two
customizable focus hold buttons
Two customizable focus hold buttons are provided on the side and top surfaces of
the lens for easy access and convenient control when shooting in horizontal or
vertical orientation. The focus hold buttons not only perform their primary
function to lock focus when recomposing, but can be customized to a number of
other functions depending on your needs.
Focus
range limiter
A focus range limiter switch makes it possible to limit AF operation to a
predetermined range to maximize AF speed and prevent focusing on unwanted
objects. The switch include three positions: OFF / ∞~ 1.5m / 2m ~ 0.7m. The OFF
position allows the lens to focus through its entire range, while the Far (∞~
1.5m) setting covers medium, head-and-shoulders, and full-length portraits, and
the Near (2m ~ 0.7m) setting is ideal for close-ups of the face or extreme
close-ups for detail.
Instant
auto/manual focus selection
Instantly switch between auto and manual focus via an AM/MF switch on the side
of the lens. This makes operation faster and easier as you let the camera and
lens focus for you, or decide to take control and manually focus on the precise
point you chose.
Lightweight durable design
The lens barrel chassis is constructed of a durable, lightweight magnesium
alloy. The hardness of the alloy helps to maintain optimum optical precision and
reliability. Together with the state-of-the-art optical design reduces the
overall size and weight of the lens to just 950 grams.
Dust/moisture resistant design
The dust and moisture resistance design makes this lens appropriate for
heavy-duty outdoor use, especially when combined with a camera that employs
weather resistant measures.
Fluorine
coated front element
The front lens surface features a fluorine coating that resists fingerprints,
dust, water, oil, and other contaminants, and makes cleaning easier if any
contaminants do become attached to the lens.
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