[4K the-robot Review] Sigma 150-600mm f/5-6.3 DG HSM Contemporary

[4K the-robot Review] Sigma 150-600mm f/5-6.3 DG HSM Contemporary
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    The Sigma 150-600mm f/5-6.3 DG HSM, is the longest lens ever tested on Lens Data. It
    goes considerably farther to shoot sports, landscapes and wildlife, made for those situations
    when we can't get close to our subjects. At 10.4 by 26 cm of 1.8 kilos, it is indeed
    large, a requirement for the extreme focal length.
    In your hands the modern Global Vision Contemporary design resembles the Sigma Art series, with
    an all black, rubberized finishing, with white lettering. Being a variable lens, Sigma gave
    special attention to the zoom ring, with a large 6cm rubber piece in the center barrel;
    exactly where your fingers rest, when you're supporting the camera. The zoom mechanism
    is a single cam, and expands the lens from 26cm to a lengthy 35cm. It can be used in
    two ways: turning the ring, with a long 160º; or by hand, literally pulling the inner barrel.
    At the rear, the manual focusing ring is apparently thought as a secondary addition, once it's
    ergonomics are bizarre. Thin, low and relatively tough, this ring seems more as a not to be
    used by accident feature, than an useful one. Besides being thin, it's actually quite
    precise, with no play, featuring even a manual override mode, to compensate for the auto
    focus motor at any time.
    Inside, Sigma employed the latest Hyper-Sonic Motor, faster and more precise. To shoot landscapes,
    it's fast and precise with top of the line cameras. The motor is quick, certainly capable
    of following moving subjects.
    Also, Sigma couldn't leave its optical stabilizer out, mandatory to shoot at telephoto distances.
    It's modern, fast, silent and, most importantly, configurable by the USB dock.
    Finally at the front, the 150-600 accepts incredibly large 95mm filters; massively fragile,
    but allowing for circular polarizers. They attach to a plastic thread, that itself sits
    inside the included-in-the-box lens hood; a plastic piece that adds 8.5cm, for a full
    43cm lens. And at the rear, the tripod collar is removable, considerably reducing the lens
    size. The metal mount features a rubber gasket against water and dust, although Sigma clearly
    states it's not a weather sealed lens.
    With a 20 elements in 14 groups optical formula, one FLD, and three special low dispersion,
    the Sigma 150-600 is an optical surprise, on par with much more expensive lenses. It
    is incredibly sharp around the center frame, with great resolution; the edges display a
    great deal of vignetting, given the very tight fit of elements; and the aberrations are kept
    to a minimum.
    While the center frame do show a greater degree of resolution than the edges, it's only
    noticeable on shallow depth of field images, when the subject shouldn't be around the
    edges at the first place. To shoot landscapes, usually at f/8 and f/11 for longer depth of
    field, this zoom has about the same resolution as most primes, with edge to edge details,
    made for printing.
    Stopping down, mostly eliminates vignetting, that is pronounced even on smaller apertures,
    like f/8 and f/11. Chromatic aberrations are mainly visible on high contrast zones, like
    trees against a bright sky, with magenta and green edges kept to a minimum. Axial aberrations
    are also invisible, with no colored halos on front or background highlights.
    The only optical complaint, comes from the very noticeable geometrical distortion, visible
    on straight lines. There's a pincushion distortion at 150mm, and at 600mm; lines seems
    to fall to the center of the frame.
    Finally colors and bokeh are pleasing on telephoto lenses, with Sigma coming as close as possible
    to Canon. Hues are yellow-biased, with warm oranges and reds, resulting in brownish greens
    and neutral blues; all easily manipulated via software. The out-of-focus quality varies,
    depending on the focal length, background distance and even subject, but it's usually
    pleasing, enough to isolate close items. The highlights, that actually give the bokeh its
    significance, are rendered without stronger edges, although not completely blurry.
    The 600mm used to be a luxury to few photographers, but the Sigma 150-600 brings it to mainstream.
    Be it for faraway subjects or to let your creativity fly, this is the lens. Nice shooting!
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