The Sigma 17-70 Lens Review
The Sigma 17-70 lens is designed for the Canon digital SLR cameras.
It is a macro lens that performs well even in low light conditions.
It comes with an inner focusing system that offers a speedy auto focus and at the same time prevents the front lens from rotating.
It is also fitted with a zoom lock switch, which will get rid of the zoom creep as it is transported.
The Sigma 17-70 has a special low dispersion element and two aspherical elements that are responsible for the correction of aberrations and production of high quality images in the entire zoom range.
With its new design, the multilayer lens coating will reduce the ghosting and flare - a common problem with digital cameras.
One outstanding thing in Sigma 17-70 is the macro capability.
The users will be able to enjoy a close focusing when they use this product.
Chromatic aberration is low at the focal lengths but rises slightly at the telephoto and maximum wide angle.
While there are geometric distortions in this class of lenses, the zero distortion points in the Sigma 17-70 will happen at 30mm.
the light falloff is typical while the maximum falloff is not more than ¼ EV.
In terms of build, the Sigma 17-70 is satisfying.
It comes with a nice solid feel that is better than the other alternatives in the same price range.
The users will not have to worry about the zoom creeping when the lens is facing up or down.
They will also benefit from the smooth focus ring, which works well and is easy for the users to manually focus.
The only problem is the noise of the auto focusing ring, but it is not as loud as compared to the other options in the market.
The Sigma 17-70 lens is known for its sharpness, just like the other lenses from the same manufacturer.
The sharpness is superb in the center but the edges are slightly soft, especially when shooting wide open of the focal length range.
When the users stop it down a little, the corners will become sharper after one stop from wide open and becomes tack sharp when they go two stops down.
Generally, it is a good lens that can be left attached to the camera for longer.
With Sigma 17-70, the buyers will enjoy more benefits such as better sharpness, good aberration correction and others, as compared to a number of the manufacturer's kit lenses available in the market.
It is a macro lens that performs well even in low light conditions.
It comes with an inner focusing system that offers a speedy auto focus and at the same time prevents the front lens from rotating.
It is also fitted with a zoom lock switch, which will get rid of the zoom creep as it is transported.
The Sigma 17-70 has a special low dispersion element and two aspherical elements that are responsible for the correction of aberrations and production of high quality images in the entire zoom range.
With its new design, the multilayer lens coating will reduce the ghosting and flare - a common problem with digital cameras.
One outstanding thing in Sigma 17-70 is the macro capability.
The users will be able to enjoy a close focusing when they use this product.
Chromatic aberration is low at the focal lengths but rises slightly at the telephoto and maximum wide angle.
While there are geometric distortions in this class of lenses, the zero distortion points in the Sigma 17-70 will happen at 30mm.
the light falloff is typical while the maximum falloff is not more than ¼ EV.
In terms of build, the Sigma 17-70 is satisfying.
It comes with a nice solid feel that is better than the other alternatives in the same price range.
The users will not have to worry about the zoom creeping when the lens is facing up or down.
They will also benefit from the smooth focus ring, which works well and is easy for the users to manually focus.
The only problem is the noise of the auto focusing ring, but it is not as loud as compared to the other options in the market.
The Sigma 17-70 lens is known for its sharpness, just like the other lenses from the same manufacturer.
The sharpness is superb in the center but the edges are slightly soft, especially when shooting wide open of the focal length range.
When the users stop it down a little, the corners will become sharper after one stop from wide open and becomes tack sharp when they go two stops down.
Generally, it is a good lens that can be left attached to the camera for longer.
With Sigma 17-70, the buyers will enjoy more benefits such as better sharpness, good aberration correction and others, as compared to a number of the manufacturer's kit lenses available in the market.
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