Canon Camera Lens EF8-15MM F/4L User Manual

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ENG-8
• Circular Fisheye
The circular fisheye effect refers to the 180 degree circular angle of view which appears within the area of the image sensor.When the
focusing distance of this particular lens is set to infinity, the circular fisheye effect is achieved by setting the focal length (wide end) to
8mm and using a camera equipped with a full frame image sensor.
• Diagonal Fisheye
The diagonal fisheye effect refers to a 180 degree diagonal angle of view which corresponds with the size of the sensor.When the
focusing distance of this particular lens is set to infinity, the diagonal fisheye effect is achieved by setting the focal length (telephoto
end) to 15mm when used with full frame image sensors, approximately 12mm when used with APS-H, and approximately 10mm when
used with APS-C.
Zooming
Description of Fisheye Lens Based Photography
The various images below show the different relationships between the fisheye lens’s 180 degree angle of view and the size
of each image sensor related to focal length.
Focal Length:8mm
* The circle corresponding with each focal length indicates a 180 degree angle of view in the imaging area.
* Vignetting occurs in the area outside of the image circle.
Full Frame
Circular Fisheye
Approx.10mm
APS-C
Diagonal Fisheye
Approx.12mm
APS-H
Diagonal Fisheye
Full Frame
Diagonal Fisheye
Approx.15mm
• Use of the zoom limiter at the lens’s wide end position does not guarantee that a diagonal fisheye effect will be
created when used with APS-C sensors.
• When the focusing distance is set to infinity, the angle of view when using the lens set at the telephoto end together
with full frame format cameras is 175°30’ (diagonal).The 180° diagonal fisheye effect is achieved by slightly turning
the zoom ring toward the wide end when the lens is set at 15 mm (telephoto end).
• Due to the optical characteristics of the lens, the size of the image circle becomes smaller when the focus position
is set at close range.

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