If you have a Canon camera with a smaller-size APS-C sensor and EF-S mount, then the 18-250mm F3.5-6.3 DC Macro OS HSM from Sigma
is an incredibly versatile lens that is a real jack-of-all-trades lens
you can carry in any situation. With a focal length spanning from a
wide-angle 18mm up to a 250 mm telephoto zoom, with macro capabilities
to boot, Sigma's 18-250mm could easily be your camera's first all-in-one
lens, or a great replacement for several smaller lenses that you're
looking to consolidate.
Sigma redesigned the optical and
structural design of this lens in order to achieve a relatively compact
size, at 4.0" long, as well as a close minimum focusing distance of
13.8" for macro photography. Their Thermally Stable Composite (TSC)
construction maintains the structure of the lens, with little variation
despite changing temperatures. The lens also incorporates a brass-made
bayonet mount, to further reinforce the lenses durability and resistance
to wear and tear over time.
The minimum focusing distance is
the same throughout the focal length of the entire zoom range, and
provides a maximum magnification ratio of 1:2.9. As an added benefit
over fixed focal length macro lenses, the size and framing of subjects
can quickly and easily be adjusted by rotating the zoom ring. For even
further convenience, at each focusing distance on the side of the lens
barrel, the maximum magnification ratio is also displayed.
18-250mm F3.5-6.3 DC Macro OS HSM has been built with Sigma's exclusive
Optical Stabilizer (OS) function. This provides approximately 4-stops of
effective camera correction, allowing for lower-light shooting, or
greater sharpness in adequate lighting situations. This benefit is even
carried into the macro range of photography, where the slightest bump or
blur could easily ruin an image. This stabilizer is also adaptive to
moving subjects, detecting your movement as you pan the camera and lens,
offering effective correction there as well.
For high image
quality, you know you've got to have high quality glass, and Sigma has
incorporated their Special Low Dispersion (SLD) glass element into the
18-250mm. In addition to the SLD element, three aspherical lenses,
including a double-sided aspherical lens, have been used in the lens'
construction--offering excellent correction of color aberration, for
better clarity and quality of images throughout the zoom range.
A Super Multi-Layer Coating has also been employed to reduce flare and
ghosting with this lens. This makes it resistant to strong incident
light, such as backlight behind a subject, providing sharper, high
contrast images even shooting into a light source. To prevent internal
reflections from occurring, the included petal-type lens hood can be
attached in order to block out extraneous light.
For a lens
that offers a wide-angle to telephoto focal length, the ability to
zoom-in with macro photography, and provides Optical Stabilization
built-in, Sigma's 18-250mm F3.5-6.3 DC Macro OS HSM made for Canon
cameras is more than a match. Whether you're on a macro product shoot, a
walk in the park, or have a wedding to go to, this lens will help you
shoot high quality images in any situation.