The Sigma 15mm F2.8 EX DG is a fisheye for full-frame digital reflex camera. It has a maximum constant aperture of F2.8 and provides a rectangular image. It is also compatible with APS-C cameras. Solid construction. The paronamas are beautiful, but it takes more pictures, more images have to be processed in post-production, but also requires a little more time to spend in the adjustment of images to make the pano. For this panoramic image with the Nikon D800E, I made 6 photos 30 degrees upwards and another 6 at 30 degrees downward.
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