Since we bought the Panasonic Lumix GX8 last year, we’ve noticed that while it is an excellent camera, it has one noticeable flaw: it suffers from severe shutter shock between 1/60 and 1/320 when you use the mechanical shutter. The problem is more salient if you use telephoto lenses like the 14-140mm or the 35-100mm. However, if you use the electronic shutter, the problem disappears.
Recently, our friend Tyson of Tyson Robichaud Photography Blog wrote a piece about the shutter shock issue and came to quite a different conclusion. He tested his version of the GX8 with the Leica 42.5mm f/1.2 Nocticron and the Olympus M.Zuiko 75mm f/1.8 with both the mechanical and electronic shutter and did not come across any sign of shutter shock.
These results suggest that only certain GX8 models are affected.
Interestingly, when the Olympus Pen E-P5 came out a couple of years ago, many users reported that it too suffered from shutter shock at the same critical shutter speeds but we personally never experienced any issues with the model we owned for nearly a year.