2.5mm

2.5mm

The Sigma 4.5mm f/2.8 EX DC circular fisheye is a photographic lens manufactured by Sigma Corporation. It is a circular fisheye lens, designed to project a 180-degree field of view in all directions onto a circular image. It is the first such lens to provide the complete circular fisheye effect on crop factor digital SLR cameras, which do not have a full 36x24mm sensor. This lens is available in Canon, Nikon, Sigma, Pentax and Sony mounts.
This lens projects a 13mm image circle, which fits nicely in a Micro Four Thirds system frame with an adapter.

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