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I saw a thread where that was discussed. In all fairness I really can't see where onion bokeh would affect an image. I think onion bokeh is a term made up by photographers to define a bokeh phenomena that would only ever bother pixel peeping photographers. Would a client ever notice onion bokeh?
Anyhow, my only criticism of this lens is the lack of weather sealing on the lens mount. Real shame they didn't add a seal but would I pay an extra £500 for a little rubber piece on the mount (i.e buy he Nikon version)? Err nope.
It definitely is not a "made up" term, they're Newton's rings. In my past experience with the Nikon 17-55 f/2.8, it was quite apparent and unattractive, but only in very unique situations. Chiefly, it became evident when close focus was combined with distant points of light against a dark background. Normally (99.9% of the time) it wasn't a problem, but it was an unfortunate trait nonetheless.
Edited on Jan 09, 2013 at 09:07 PM · View previous versions