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They are referring to a sealed lens mount but this leaves a question mark regarding the focus ring at least. Sigma's statement regarding the degree of sealing is a bit fuzzy. It's almost too big when trying to get a handle on the lens for mounting/unmounting. The ginormous, rubberized focus ring is super smooth.
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It may be a "Contemporary" lens but there's nothing cheapish about it. Sigma tends to prefer compromising size in favor of performance. First of all, it's not a small lens and as such it follows a bit of a Sigma tradition. Upon the initial contact, you will immediately notice two things. So mirrorless lenses can be affordable after all. However, if anything there's a positive side effect to the consumer-grade designation - the pricing is very moderate at less the 400EUR/USD. If you are familiar with Sigma's naming convention, it may surprise you that it doesn't belong to Sigma's professional grade "ART" series albeit at least the large aperture seems to suggest otherwise. SIgma is maintaining a small set of three very fast prime lenses dedicated to APS-C and Micro-Four-Thirds mirrorless cameras - a 30mm f/1.4, a 56mm f/1.4 and the Sigma 16mm f/1.4 DC DN Contemporary that we are going to discuss here. Review by Klaus Schroiff, published February 2020
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