Canon's full-frame, wideangle-to-fisheye zoom lens attempts to offer more than just a one-trick effect. Mat Gallagher finds out whether this lens really should have a place in your kit bag
Many image-editing programs provide correction for lens distortion and these can often extend to extreme wideangles such as the 8-15mm optic. Panoramic software also tends to feature the ability to turn 360° circular images into regular framed scenes by a process known as unwrapping. However, as fisheye images are only 180° views, the process for converting them is not the same.
As the 8-15mm lens is still quite new it is not yet profiled in most software, so adjustments must be made manually. The controls will allow the removal of barrel distortion in the image, as well as control of colour fringing, although to return the circular shape to a standard rectangular frame it will be necessary to crop into the image.
DxO Optics Pro (www.dxo.com) is one of the most advanced lens-correction tools and, although it doesn’t currently have a dedicated profile for the 8-15mm lens within its controls, it has a fisheye option alongside barrel and pincushion correction to cope with the more extreme distortions at stake.
Images: Hayden, taken with the Sigma 8-16mm at 8mm on an APS-C sensor (cropped in). Hayden, taken at 8mm on a full-frame sensor for a full, circular fisheye effect
Image: Hayden, taken at 15mm on a full-frame sensor
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