Sigma 8-16mm on NEX-7, first impressions

Started May 17, 2012 | Discussions thread
ProfHankD
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Looking straight down from the Gateway Arch
In reply to ProfHankD, Jun 11, 2012

The Sigma 8-16mm is hard to use, but so very worth the effort.... Here's an "impossible" photo looking straight down from the top of the Gateway Arch in St. Louis:

Why impossible? Well, there are no windows there. The tiny, thick-glass, somewhat dirty, viewports on the sides of the top of the arch don't let you look straight down either, only at a 60 degree slant (it is a triangular section). Fortunately, the 8mm setting was just wide enough to capture under the arch. Thus, what you're looking at is really a simple stitch of 4 images, two taken on each side of the arch, put together using Hugin to create a cylindrical projection which I slightly tweaked in GIMP.

For what it's worth, I tried to do something like this years ago... and failed. The viewports do not really work with a fisheye and I didn't have a rectilinear lens wide enough.

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