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Lenses
Wide-Angle
15mm Full Frame Fisheye vs. 16-35mm at the wide end
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<blockquote data-quote="BackdoorArts" data-source="post: 210591" data-attributes="member: 9240"><p>OK, a picture is worth 1000 words, right...</p><p></p><p>[ATTACH=full]56864[/ATTACH]</p><p></p><p>Here are the 4 widest angle lenses in the Sigma line from the photo I was referencing. Ignoring the circle fisheye, if you compare the 15mm Fisheye, 12mm and 17mm you can clearly see that the 15mm Fisheye with "180 degree view" is barely wider than the 17mm at 103.7 degrees (note the grey box excluding the things in the 15mm photo not in the 17mm photo), and definitely narrower than the 122 degrees from the 12mm (shaded area in the 12mm photo denotes subject matter not found in the 15mm photo). So while they're calling it a 180 degree full frame fisheye, the truth is that the field of view seems to be consistent with a 15mm lens and not the mathematically derived 150+ degrees you'd expect if you're getting 180 degrees on the diagonal. </p><p></p><p>Or the example photo is just wrong.</p></blockquote><p></p>
[QUOTE="BackdoorArts, post: 210591, member: 9240"] OK, a picture is worth 1000 words, right... [ATTACH type="full"]56864._xfImport[/ATTACH] Here are the 4 widest angle lenses in the Sigma line from the photo I was referencing. Ignoring the circle fisheye, if you compare the 15mm Fisheye, 12mm and 17mm you can clearly see that the 15mm Fisheye with "180 degree view" is barely wider than the 17mm at 103.7 degrees (note the grey box excluding the things in the 15mm photo not in the 17mm photo), and definitely narrower than the 122 degrees from the 12mm (shaded area in the 12mm photo denotes subject matter not found in the 15mm photo). So while they're calling it a 180 degree full frame fisheye, the truth is that the field of view seems to be consistent with a 15mm lens and not the mathematically derived 150+ degrees you'd expect if you're getting 180 degrees on the diagonal. Or the example photo is just wrong. [/QUOTE]
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Lenses
Wide-Angle
15mm Full Frame Fisheye vs. 16-35mm at the wide end
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