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<blockquote data-quote="BackdoorArts" data-source="post: 227273" data-attributes="member: 9240">Easiest way to understand it is that a rectilinear lens (for the most part) removes barrel distortion so that your vertical and horizontal lines remain straight.&nbsp; A fisheye is all about barrel distortion.&nbsp; If you look in the photo above, the &quot;de-fisheyed&quot; shot is roughly what a rectilinear 15mm shot would look like, where the one underneath has the fisheye elements and evidence of barrel distortion/pin-cushioning.&nbsp; &nbsp; In rectilinear lenses the perspective is often exaggerated in order to make corrections. Here's a good example of the difference.&nbsp; The top is the curvilinear perspective you get from a fisheye, the bottom is with a rectilinear lens.&nbsp; Both show the same field of view and you can see how the edges become stretched in the rectilinear photo.&nbsp; You can also see how the corners are cut off, which is where you lose the 180 degree field of view in the non-fisheye.<img src="http://upload.wikimedia.org/wikipedia/en/2/2c/Panotools5618.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="BackdoorArts, post: 227273, member: 9240"] Easiest way to understand it is that a rectilinear lens (for the most part) removes barrel distortion so that your vertical and horizontal lines remain straight. A fisheye is all about barrel distortion. If you look in the photo above, the "de-fisheyed" shot is roughly what a rectilinear 15mm shot would look like, where the one underneath has the fisheye elements and evidence of barrel distortion/pin-cushioning. In rectilinear lenses the perspective is often exaggerated in order to make corrections. Here's a good example of the difference. The top is the curvilinear perspective you get from a fisheye, the bottom is with a rectilinear lens. Both show the same field of view and you can see how the edges become stretched in the rectilinear photo. You can also see how the corners are cut off, which is where you lose the 180 degree field of view in the non-fisheye. [IMG]http://upload.wikimedia.org/wikipedia/en/2/2c/Panotools5618.jpg[/IMG] [/QUOTE]

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