The Sigma 18-35 "Art," however, takes a different approach than the Leica/Zeiss-esque 100% metallic build we've come to love. The Limited lens series, both FA and DA, certainly satisfy both criteria. As Pentaxians, we have come to appreciate premium lenses that not only perform well, but also look the part. Upon closer inspection the next thing you notice is simply how beautiful the lens is. The first thing that comes to mind when you hold this lens is its sheer size, but we'll touch on that a bit more a few sections down comparing this "Art" lens to other lenses. We suspect that should you be in inclement conditions (lack of weather sealing aside), the Sigma may be a bit more prone to flecks of dust or small water droplets sticking to the glass as compared to Pentax's SP treated lenses. At the end of the day, it's not a huge issue and won't have a direct impact on the lens's image quality output, but it was a difference we immediately noticed. On the Pentax lenses, the pen seemed to just glide across while the Sigma seemed to exhibit a lot more friction, "sticking" a bit more. Hard to explain in words, it was merely a difference in "smoothness" between the SP coated lenses and the Sigma 18-35 when rubbing the lenspen across them. While using a lenspen to clean the front objective, the lack of Pentax's Super Protect coating became immediately apparent. Plenty of 67's and 77's, but not a single 72mm threading.Īdditionally, we wanted to point out an interesting observation regarding cleaning the glass (as some accidental finger prints may have appeared on the front lens during our time with it). This is important to note for those of you who use lots of filters and expect to share them across several lenses - up until the official announcement of the HD Pentax-DA 16-85mm F3.5-5.6 ED DC WR in October 2014, there were no lenses in the current Pentax line-up that featured that filter size. Protected by a Sigma-branded pinch-type cap, the filter threading of the lens is 72mm. The front element of the 18-35 is free of any markings, which is unlike many Pentax lenses that have the lens name or at least the filter size engraved on the face. Why? Well, that way you can appreciate exactly what to expect should you decide to commit your hard earned money on the Sigma 18-35 F1.8 zoom. In this section we scrutinize every aspect of the physical construction of this lens. Sigma 18-35mm F1.8 DC HSM "Art" Construction and Handling
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