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<blockquote data-quote="moony16" data-source="post: 283949" data-attributes="member: 23104">Brad, thank you.&nbsp; Yes, believe it or not, the Sigma 12-24&nbsp; has less barrel &amp; pincushion distortion than the holy “Trinitarian” Nikon 14-24, although the latter isn’t too shabby either.There are Geometric &amp; Perspective distortions which are of particular concern to the UWA shooter.&nbsp; Geometric are distortions caused by the lens itself, while Perspective are caused by the AOV as well as not having the sensor plane parallel to the vertical subject.Except with lenses with extreme barrel distortion, perspective distortion is the real problem in UWA shooting.&nbsp; In particular, the phenomenon of converging verticals can plague UWA compositions when the camera is not held level while depressing the shutter.I did apply minor corrections to some of the shots above in order to correct perspective distortions.&nbsp; But they were minor, &amp; if these shots were juxtaposed with the unadjusted shots, only subtle nuances would be seen, &amp; that mainly because an adjusted image needs to be trimmed (cropped a little) in order to clean up the effects of perspective adjustments to pictures.Yes, I sometimes shoot the 12-24 on my Fx body too.JT</blockquote>

[QUOTE="moony16, post: 283949, member: 23104"] Brad, thank you. Yes, believe it or not, the Sigma 12-24 has less barrel & pincushion distortion than the holy “Trinitarian” Nikon 14-24, although the latter isn’t too shabby either. There are Geometric & Perspective distortions which are of particular concern to the UWA shooter. Geometric are distortions caused by the lens itself, while Perspective are caused by the AOV as well as not having the sensor plane parallel to the vertical subject. Except with lenses with extreme barrel distortion, perspective distortion is the real problem in UWA shooting. In particular, the phenomenon of converging verticals can plague UWA compositions when the camera is not held level while depressing the shutter. I did apply minor corrections to some of the shots above in order to correct perspective distortions. But they were minor, & if these shots were juxtaposed with the unadjusted shots, only subtle nuances would be seen, & that mainly because an adjusted image needs to be trimmed (cropped a little) in order to clean up the effects of perspective adjustments to pictures. Yes, I sometimes shoot the 12-24 on my Fx body too. JT [/QUOTE]

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