Can the zoom fish-eye give rectilinear images on FF camera?
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charlesa said:
Incorrect.
The 8-15mm is a fisheye lens at all focal lengths. At 14-15mm on FF, it's a 'full frame fisheye' meaning the FoV fills the frame (you're getting an AoV of ~175°). At 8mm on FF, it's a 'circular fisheye' meaning a circular 180° AoV inset in the rectangle (black borders).
If you want rectilinear from the 8-15mm fisheye, you must de-fish in post (at the cost of corner sharpness).
The widest rectilinear Canon lens is the 14mm prime, Sigma has a rectilinear zoom that goes to 12mm.
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neuroanatomist said:charlesa said:
Incorrect.
The 8-15mm is a fisheye lens at all focal lengths. At 14-15mm on FF, it's a 'full frame fisheye' meaning the FoV fills the frame (you're getting an AoV of ~175°). At 8mm on FF, it's a 'circular fisheye' meaning a circular 180° AoV inset in the rectangle (black borders).
If you want rectilinear from the 8-15mm fisheye, you must de-fish in post (at the cost of corner sharpness).
The widest rectilinear Canon lens is the 14mm prime, Sigma has a rectilinear zoom that goes to 12mm.
Neuro
Great info as usual. Follow on question - what is the image quality of the sigma 12mm and how does it compare to the canon 14mm (which I have)
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RGF said:
LR has a lens profile for the Canon 15mm f/2.8 fisheye, which can be used to defish images well for the 8-15 f/4. A defished 8-15 image at 15mm has a wider AOV than the EF 14 II rectilinear, so defishing does have at least one advantage. The corners and edges of a defished image do soften up as one would expect, but it's decent if you don't pixel peep.
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