100-300 funky bokeh

Started Oct 10, 2011 | Discussions thread
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greerd Contributing Member • Posts: 763
100-300 funky bokeh

I've read about this before, where the oof area of the 100-300 was described as funky. It was described on the mu-43's forum in the 100-300mm thread. If the focal point is not close and the background was much further, the oof rendering of this lens could look funky. (for lack of a better term). IIRC, the funkiness was attributed to the heat waves of the hot day the pictures were taken.

I have had the 100-300 for some months now and it is my most used lens, but haven't run into this phenomenon until now. It wasn't hot (24C) poor old Brutus wasn't very far away, so no environmental excuses can be used.

Here's the scene taken at 100mm, 1/200, f5.6 (max f4) iso400.

Below shows what I'm talking about, the foreground branches and leaves above poor old Brutus look ... funky.
275mm, 1/500, f5.6 (max f5.5) iso 640

Another showing both foreground and background funkiness. The background to the left of Brutus's butt shown the same thing.

280mm, 1/500, f5.6 (max f5.5) iso 400

I shot these hand-held but I don't think this is a cause.
Anyone else seen this? Any thoughts?

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Doug Greer

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