Sigma 8mm f/4 and f/3.5.EX DG Fisheye Lens

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Sigma 8mm f/4.EX DG Fisheye Lens

Sigma 8mm f/3.5.EX DG Fisheye Lens

This lens has been replaced by the Sigma f/3.5 EX DG Circular Fisheye. Digitally optimized circular fisheye auto-focus lens - 8mm F/4 EX DG CIRCULAR FISHEYE lens is unveiled today. A new coating technology on the Sigma 8mm fisheye lens reduces flare and ghosting.

This circular fisheye lens is used to produce circular images, creating vast distortion with an angle of view of 180° when attached to a full-frame digital or 35mm film SLR camera. This auto focus lens is equipped with a new multi-layer coating technology that reduces both flare and ghosting and ensures accurate color balance and high image quality for both film and digital SLR cameras.

This lens can be used for the scientific applications such as the solid angle measurements of cloud distribution over the sky, the vegetation distribution of the forest, etc., due to the quantifiable angle/area relationship it produces. Also supplied with the lens is a fitted padded case and a gelatin filter holder at the rear, allowing the use of gelatin filters.

8mm F4 EX DG CIRCULAR FISHEYE FEATURES

* New multi-layer lens coating and lens design reduce flare and ghosting
* High image quality for film and digital SLR cameras

* Useful for academic/technical applications such as solid angle measurements

* Equipped with a gelatin filter holder at the rear

Note: this lens has no built-in motor and will not autofocus on the Nikon D40/D40x, Nikon D60, Nikon D3000, Nikon D3100 or the Nikon D5000 Cameras.

Large aperture F3.5 circular fisheye lens with close up capability, optimized for use with digital SLR cameras. This circular fisheye lens produces circular images with an angle of view of 180° when attached to a full-frame digital SLR or 35mm film SLR camera. It has a fast maximum aperture of F3.5 and a minimum focusing distance of 13.5cm (5.3"). Sigma’s super multi-layer coating and Special Low Dispersion (SLD) glass provide excellent image quality for digital and film SLR cameras. The special fisheye design allows maximum creative expression.

*Full circle can only be captured with full frame 35mm format digital SLR and film SLR cameras.

This circular fisheye lens produces circular images with an angle of view of 180°and also incorporates an auto focus system to achieve accurate focusing that might be difficult through the camera`s viewfinder due to the extremely large depth of field.

F3.5 maximum aperture This lens is perfectly suited for low light conditions indoors or at dusk.

Close-up Photography. This circular fisheye lens has a minimum focusing distance of 13.5cm (5.3") and a maximum magnification of 1:4.6 making it particularly useful for close-up photography.

Excellent optical performance
Special Low Dispersion (SLD) glass offer effective compensation of color aberration.

Reduction of flare and ghosting. Sigma’s super multi-layer lens coating reduces flare and ghosting, a common problem with digital cameras and also creates an optimum color balance.

Note: this lens has no built-in motor and will not autofocus on the Nikon D40/D40x, Nikon D60, Nikon D3000, Nikon D3100 or the Nikon D5000 Cameras.

Lens Construction	10 Elements in 6 Groups
Angle of View	180 degrees
Number of Diaphragm Blades	5
Minimum Aperture	F22
Minimum Focusing Distance	20cm/7.8 in.
Maximum Magnification	1:13.9
Filter Size	Rear (Gelatin Filter)
Dimensions	Diameter 73.5mm (2.8in) x Length 63mm (2.4in)
Weight	320gr/11.2oz
Corresponding AF Mounts	SIGMA, CANON, NIKON, SONY/MINOLTA, PENTAX, FOUR THIRDS
Introduced	June 16, 2003
Discontinued	2008

Lens Construction	11 Elements in 6 Groups
Angle of View	180 degrees
Number of Diaphragm Blades	6
Minimum Aperture	F22
Minimum Focusing Distance	13.5cm/5.3 in.
Maximum Magnification	1:4.6
Filter Size	Rear (Gelatin Filter)
Dimensions	Diameter 73.5mm (2.8in) x Length 68.6mm (2.7in)
Weight	400gr/14.0oz
Corresponding AF Mounts	SIGMA, CANON, NIKON, SONY/MINOLTA, PENTAX, FOUR THIRDS
Introduced	August 1, 2006

Comments: very compact size compared with Nikkor (this sample is the longer, earlier version); approx. 170 degree circular image (image circle narrows when the lens is stopped down); better in color than B & W; very good sharpness even wide open in color, very good almost to the edge of coverage in B & W when stopped down to about f11 good on TC14A by f8

A fisheye lens is a wide-angle lens that takes in an extremely wide, hemispherical image. Originally developed for use in meteorology to study cloud formation and called "whole-sky lenses", fisheye lenses quickly became popular in general photography for their unique, distorted appearance. They are often used by photographers shooting broad landscapes to suggest the curve of the Earth. Hemispherical photography is used for various scientific purposes to study plant canopy geometry and to calculate near-ground solar radiation.

The first types of fisheye lenses to be developed were "circular fisheyes" — lenses which take in a 180° hemisphere and project this as a circle within the film frame. Some circular fisheyes are available in orthographic projection models for scientific applications. These have a 180° vertical angle of view, and the horizontal and diagonal angle of view are also 180°. Most circular fisheye lenses cover a smaller image circle than rectilinear lenses, so the corners of the frame will be completely dark.

Alternative Fisheye Lenses