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8mm F3.5 EX
DG Circular Fisheye

from 9 100 SEK

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Circular Fisheye lens with unique perspective
180 degrees angle of view for exaggerated close ups
Carrying Case, front/rear caps & front adapter ring

Specifications

Construction

Angle of view	Wide Angle
Camera Type	DSLR
Lens Mount	Canon EF-mount, Nikon F, Sigma SA
Sensor Size	Full Frame
Construction	11 Elements in 6 Groups
Angle of view	180º
Number of diaphragm blades	6
Minimum aperture	F22
Minimum focusing distance	13.5 cm
Maximum magnification ratio	1:4.6
Filter diameter	n/a
Dimensions (diameter x length)	⌀ 73.5 mm x 68.6 mm
Dimensions (diameter x length)
Weight (g)	400 g
Weight (g)
Supplied Accessories	Cover Lens Cap LC735-02, Rear Cap LCR II, Case LS-483N
EAN-code	Canon EF Nikon F 085126485276 085126485597
EAN	EAN
Specifications Info	* The appearance, specifications, and the like of the product are subject to change for improvement without notice. Nikon Mount does not have aperture ring * Nikon Mount has no built in motor lens: NOT compatible with D40, D40x, D60, D3000, D5000 DISCONTINUED MODEL

LENS CONSTRUCTION

SLD GLASS

MTF CHART

There are two types of MTF chart. One considers the diffraction quality of light, which is called "Diffraction MTF", and the other, "Geometrical MTF" does not.

The quality of light appears in the diffracted light, and becomes more distinct as the F value gets bigger, resulting in lower image quality. Also, diffracted light exists at every aperture, which is why Sigma has been releasing Diffraction MTF data from the beginning since it is very close to the actual image data.

The advantage of using "Geometric MTF" data is that it is easy to measure and calculate since it does not consider the diffraction quality of light, yet it tends to show higher values in the graph than actual images.

The readings at 10 lines per millimeter measure the lens's contrast ability ( red lines), repeating fine parallel lines spaced at 30 lines per millimeter measure the lens's sharpness ability (green lines), when the aperture is wide open.

Fine repeating line sets are created parallel to a diagonal line running from corner to corner of the frame, are called Sagittal lines (S) and sets of repeating lines vertical to these lines are drawn, called Moridional (M) line sets.

*The MTF chart gives the result at the wide-open aperture.