Nikon 24-120mm f4 vs Sigma 24-105mm f4

Started 4 days ago | Discussions thread
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Island Golfer Senior Member • Posts: 2,738
Re: Nikon 24-120mm f4 vs Sigma 24-105mm f4

You are correct. It's not simply a gasket around the lens mount that "seals" a lens. Lenses moving in and out can vacuum in dust & particles, as well as any other area on a lens that's left unprotected. Sealing everything costs money, increasing the cost of the lens. Undoubtedly, that's why Sigma doesn't always do it (i.e. zoom and focusing rings, lens barrels, possibly interlocking panels, rubber gaskets around buttons & switches, etc.) Just look at the almost thousand dollar price difference between the Sigma 150-600mm Contemporary lens and the Sigma 150-600mm Sport version.

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