Hello all, Is there a rule of thumb when to switch on (or off) the IOS? In this case on my recently acquired XF18-55? I've read that that with high(er) shutter speeds, the IOS does more harm than good When switched on and a shutter speed of around 1/120 I see bad focus on the right-hand side of the image. The IOS does work, a shot with a shutter speed of 1/20 looks much better. Thanks. René.