On Sunday, I attended the second Open Day at the Wagners Wellcamp Airport (aka Brisbane West Airport), just west of Toowoomba. As I expected to take photos of aircraft and model aircraft on the wing, I took my Olympus OM-D E-M1 together with the Zuiko 70-300mm 1:4-5.6 lens working through a MMF-3 adaptor (for its effective 140-600mm reach) and the Zuiko 12-40mm 1:2.8 PRO lens.
As expected, the 12-40 worked flawlessly, but I did notice a rather unpleasant bokeh on the 70-300, which I had not noticed previously, when using it on an Olympus E-3:
I am wondering whether it is the bokeh, or whether my image stability settings of S-IS AUTO may have had anything to do with it.
Has anybody else noticed this? - It wasn't a heat haze.