And with this, we arrive at the first weak point of the Sigma 35mm, at least from a Pentax user's perspective.Since Sigma introduced the Art line in 2013 photographers have been treated to some stunning lenses that rival - or better - some of the high end lenses produced by Canon and Nikon. One might wonder how a wide-aperture lens designed for full-frame cameras feels and handles on Pentax's small APS-C DSLR bodies. Sigma 35mm Pentax Lens Mount - Click to Enlarge Looking through the back of the lens, you can see its 9 rounded aperture blade, perhaps one of its most important features, as we will discuss later! every Pentax DSLR since 2006, but not film cameras). The Pentax version of this lens employs the KAF3 mount, which means that the autofocus will only work with cameras that support SDM (i.e. Sigma 35mm AF/MF Switch - Click to Enlarge Manual focus can be enabled either via this switch or the switch on your camera (note that manual focus adjustments can be made even when this switch is set to "AF", as described at the top of this page). Sigma 35mm Top View with Hood - Click to EnlargeĪpart from the focusing ring, the only other control on the barrel of the lens is the AF/MF switch, which is located on the left side of the lens. The front of the lens does not rotate when focusing. If you'd like to mount a filter on the front of the lens, you can: a standard 67mm filter thread is provided. Although the hood can be reversed for convenient storage, it does cover the entire focusing ring when reversed, which prevents you from focusing manually unless you take it off or flip it. It is easy to mount and there is no play. The petal-shaped lens hood mounts sturdily onto the bayonet at the front of the lens. The rudimentary depth of field scale also isn't very helpful due to the short focus throw of the lens. This lens has a distance scale just below the focusing ring, but it can be hard to read at times due to the small opening. This can be a nuisance if you frequently swap between Sigma and non-Sigma lenses. Sigma lenses differ from Pentax and Nikon lenses in that they focus "backwards": you turn the ring to the left rather than to the right to focus toward infinity, and vice-versa to focus closer. Like other modern high-end lenses, the Sigma 35mm allows for full-time manual focus adjustments using the focusing ring (Pentax calls this Quick Shift, a feature found on most DA lenses). It does not rotate during autofocus nor does it have hard stops for infinity and minimum focus. The focusing ring turns smoothly and allows for very fine control of the focus thanks to internal gearing. If we had to be picky, then we'd say that the Pentax Limited lenses look better design-wise, but this is of course a minor detail. The barrel of the lens is made of metal and gives you plenty to hold on to while also offering a sizable focusing ring. The Sigma 35mm F1.4 has a sturdy build quality and an elegant, simplistic design. Sigma 35mm F1.4 DG HSM "Art" Construction and Handling
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