The example image below is shot using the Sigma 15mm full-frame fisheye lens (Olympus OM1). Angular coverage in the horizontal direction exceeds 140°, far more than what is achievable with rectilinear lenses. Also, please note the negligible light fall-off at the corners, which in rectilinear lenses often requires the use of center filters.
No tripod was used, and the camera was tilted upwards to get the whole view of the building (Concert Hall Freiburg). Also, a slight rotational missalignment is inevidable.
All these errors can be corrected in one step using Panorama Tools. The image is remapped to rectilinear projection, shifted vertically and horizontally, and slightly rotated. If required, the rgb-misalignment at the edges (one of the problems of ultra-wide lenses) could have been corrected also. The resulting image is shown below:
You need a working installation of Panorama Tools.
If you need additional corrections, press 'correct'. A
new dialog comes up, which allows you to correct rgb-misalignements,
additional radial and vertical distortions, skew, etc. If your lens exhibits light fall off at the edges, you can correct that separately using 'correct's Radial Luminance tool.
Copyright ©; H. Dersch 1999