Sigma full-frame diagonal fisheye for Nikon F with 180-degree corner-to-corner coverage.
The Sigma 15mm f/2.8 EX DG Diagonal Fisheye is a full-frame diagonal fisheye lens for Nikon F mount, providing a 180-degree field of view corner to corner. Unlike circular fisheyes, the diagonal projection fills the entire frame with the curved perspective, making fisheye images more immediately usable for creative work.
Optical quality is good with effective multi-coating controlling the flare and ghosting that fisheye designs are prone to due to their extreme field of view. The EX build quality provides a premium feel. The D designation enables distance communication with Nikon bodies for improved matrix metering.
Build quality follows Sigma's EX premium standard with a solid barrel and quality construction. The lens is compact for a full-frame fisheye and includes a built-in petal hood that protects the protruding front element. The autofocus provides convenient operation though manual focus is equally practical given the extreme depth of field.
On the used market, the Sigma 15mm f/2.8 fisheye offers affordable full-frame diagonal fisheye capability for Nikon. For creative photographers, astrophotographers wanting extreme sky coverage, and anyone wanting the distinctive fisheye effect at low cost, it provides a proven and capable creative tool.