Sigma 15mm f/2.8 EX Fisheye - Sigma SA, Canon EF, Nikon F, Sony A, Pentax K Mount

The Sigma 15mm f/2.8 EX Fisheye is a diagonal fisheye lens designed for full-frame cameras, offering a 180-degree field of view across the diagonal of the sensor. Unlike circular fisheyes, this model fills the entire rectangular frame, making it a popular choice for extreme wide-angle landscapes, action sports, and architectural interiors. It features a close minimum focusing distance of 15cm and a bright f/2.8 aperture for low-light versatility. Check the condition of the bulbous front element, as it is easily marked if handled without care. The integrated petal hood should be free of cracks or significant impact damage. SDS tests the autofocus mechanism (which may be noisier than HSM models depending on the mount) and ensures the aperture blades are clean. We also check the rear gelatin filter holder for any deformation that could affect filter placement.