Sony SLT-A57M Spécifications - Page 18

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Mid-range telephoto

DT 50mm F1.8 SAM SAL50F18

At 50 mm

100

Distance from optical center of lens (mm)

Max. aperture

F8 aperture

Spatial frequency

10 line pairs/mm

30 line pairs/mm

R: Radial values T: Tangential values

M mode, 1/800 sec., F8, ISO 400, Auto white balance

Compact, lightweight and eminently portable

Circular aperture for attractive defocusing

Responsive internal SAM (Smooth Autofocus Motor) autofocus drive

Bright enough for handheld shooting in low light

35mm equivalent focal length: 75mm

On APS-C format cameras, for which it is specifically designed, the

SAL50F18 functions as a moderate telephoto lens ( equivalent to 75mm on

a full-frame camera ) that can be ideal for shooting portraits as well as for

framing and isolating areas of interest in broader, busier scenes. Not only

can you isolate the desired subject matter by framing, but you can also

take advantage of the lens's large F1.8 maximum aperture and circular

aperture design to isolate your subject from the background by using

defocusing. The large maximum aperture also facilitates shooting in low

light, a capability that is further enhanced by SteadyShot INSIDE™ image

stabilization featured in a series bodies.

• Weight (approx): 170 g

• Dimensions (Dia. x L): 70 x 45 mm

• Max. magnification ratio: 0.2x

M mode, 1/640 sec., F2.8, -0.3EV, ISO 200, Manual white balance

Mid-range telephoto

85mm F2.8 SAM SAL85F28

Compact, lightweight and eminently portable

Excellent corner-to-corner sharpness

Large maximum aperture plus circular aperture design for smooth defocusing

Responsive internal SAM (Smooth Autofocus Motor) autofocus drive

At 85 mm

100

Photographers often choose a large-aperture 85mm lens for portraits for

two compelling reasons. First, the 85mm focal length makes it easy to fill

the frame with the subject from a comfortable distance, without getting

so close that unflattering distortion occurs. And second, a large maximum

aperture works with the medium-long focal length to create beautifully

defocused backgrounds, so that the subject seems to "pop" out of the

image. The SAL85F28 is just such a lens. But it's not just limited to portraits. It's

a great choice for any situation where you want a bit more magnification

than a "standard" focal length provides. And the fact that it is light and

compact means that it's easy to take along as a second lens.