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02-28-2015, 07:01 PM   #1
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Join Date: Aug 2014
Posts: 407
Rokinon 8mm fisheye coma

Hi all,
Got a new rokinon 8mm fisheye 3.5 from Amazon yesterday. I had debated between rectilinear or fisheye, and the 180 fov for milky seemed like it had potential after a little defishing. Aside from the focus scale being off, as I've read all sam/rok/bower lenses are, my copy seems to suffer from a good bit of coma until I stop it down to around 6.3, making it fairly useless for astro. Is mine just a bad copy that needs to go back to Amazon since I haven't read of this being a common issue?

03-01-2015, 09:07 AM   #2

Join Date: Jan 2011
Location: New York
Posts: 4,663
LensTip is the only review site I know of that routinely evaluates coma. Here's their test Samyang 8 mm f/3.5 Aspherical IF MC Fish-eye review - Coma and astigmatism -

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