Sigma 15mm f2.8 EX DG Diagonal fisheye auto-focus lens.

Suitable for all Film and Digital SLR cameras including Full frame Digital

This diagonal fisheye lens has an angle of view of 180 in the diagonal direction as well as minimum shooting distance of 15cm

Minimum Shooting Distance of 15cm:
The minimum shooting distance of this lens is only 15cm(5.9 inch) and it has maximum magnification of 1:3.8. Minimum shooting distance of 15cm (5.9in.) and large depth of field allow close up photography that covers the objects surrounding the photographic subject like an insect or flower.

Gelatin Filter Holder:
This lens is supplied with a gelatin filter holder at the rear, allowing the use of gelatin filters.

It can be used with Digital SLR cameras:
Digital SLR, that has smaller image sensor size than 35mm film cameras. Therefore, angle of view of 180 cannot be obtained with Digital SLR cameras. However, it uses only the centre part of the frame, therefore, peripheral distortion will be very small. You can shoot as normal ultra wide angle lens.

Specifications -

Lens Construction -7 Elements in 6 Groups
Angle of View - 180 degrees
Number of Diaphragm Blades - 7 Blades
Minimum Aperture - F22
Minimum Focusing Distance - 15cm
Maximum Magnification - 1:3.8
Filter Size Rear - (Gelatin Filter)
Dimensions - Diameter 73.5mm X Length 65mm
Weight - 370g