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Sigma 28mm F1.8 EX DG ASP Macro
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SPECIFICATIONS:
This lens has a macro focusing capability
with fast F1.8 maximum aperture, which is ideal for Digital SLR cameras.
- Macro capability
This lens is capable of Macro photography, with minimum shooting distance
of 20cm (reproduction ratio 1 : 2.9) and angle of view is 75.4. You can take
picture not only the subject but also the surrounding scenery.
- Large front element and Super
wide-angle
The lens has an advanced optical construction, in order to obtain adequate
peripheral brightness with open aperture. Also, the iris diaphragm has 9 diaphragm
blades to obtain beautiful out of focus images in the foreground and background.
- Handling
The lens incorporates a Dual-Focus (DF) mechanism. It is easy to hold the
lens, since the focusing ring does not rotate during auto-focus, yet it provides
adequate focusing torque of the focusing ring during manual focusing of the
lens. Also, this also allows the use of a Petal-type Hood and the easy use
of a polarizing filter.
- Aspherical lens
It incorporates a floating focus system and uses two aspherical lens elements
for minimizing distortion, aberration and astigmatism.
- Lens Construction 10 Elements
in 9 Groups
- Angle of View 75.4 degrees
- Number of Diaphragm Blades 9 Blades
- Minimum Aperture F22
- Minimum Focusing Distance 20cm
- Maximum Magnification 1:2.9
- Filter Size 77mm
- Dimensions Diameter 83.6mm X Length
82.5mm
- Weight 500g
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