
Originally Posted by
GrumpyDiver
Steve – having had a look at the metadata, your shots are all done at ISO 800 at f/5.6 (I assume this is wide open for that lens) and shutter speeds vary from 1/350 up to 1/800, so with IS on, there should be very little motion blur. With a modern camera like a 6D, ISO 800 should be quite clean and this model has very good high ISO image quality.
Sharpening and noise reduction are effectively opposites. To reduce noise, you end up blurring the image ever so slightly (also known as pixel smearing). If you sharpen, in places where dark pixels are adjacent to light pixels, you end up darkening the dark pixels and lighten the light ones, (i.e. increasing edge contrast) which accentuates “noise”. If you are working in Photoshop, rather than Lightroom, you could create different layers and reduce their impact locally through the use of layer masks, but that would be a lot of work.
I understand that these images have been downsized, but the artifacts that I see suggest that you have done a fairly significant crop and what I see looks more like pixelization, rather than noise. If this is the case, then your issue is that you were not close enough and are doing an extreme crop is producing this result. Frankly, the best solution there is to get closer when you shoot (or to buy a longer lens).