Sony SAL100M28 Specification Guide (en)

100mm f/2.8 Macro Lens
Sharp Macro Focusing
You can get closer to your subject to 
capture low-angle shots of insects, 
flowers and other natural wonders -- 
and broad depth of field lets you keep 
backgrounds in focus too.
Bright f2.8 Aperture
In conjunction with the Super 
SteadyShot® image stabilization 
system of the Sony α (alpha) DSLR-A100 
camera, this lens captures bright, 
steady images even working with 
hand-held camera in low light.
High Contrast and Resolution
Excellent optical precision gives your 
shots greater visual accuracy for close 
analysis of your subject.
Focus Range Limiter
Speeds auto-focus response by limiting 
the range of distances that are brought 
into focus -- Close-up Range, or 
Telephoto Range.
Focus Hold Button
For full creative control, a focus hold 
button located on the lens can lock 
Auto Clutch
In auto-focus mode, the manual focus 
ring does not rotate -- which improves 
handling ease.
Circular Aperture
Because aperture blades form a near 
circle at the wide openings used for 
low-light shots, spot-light sources have 
a pleasing circular defocused effect.