Earlier this month, Sigma announced its new 16-28mm f/2.8 DG DN Contemporary lens. One of the features is that it features internal zoom and focus mechanisms, so it doesn’t change length when zooming or focusing.
If you’ve been wondering how it works and what it looks like on the inside, Sigma has a video for you. It shows a cross-section of the lens, all of its elements, and its internal zoom mechanism.
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