I just purchased a GH4 and a Rokinon 16mm. I set the camera to manual focus and used the zebra lines to focus. I was shooting a dance recital from the balcony so I was quite a distance. everything looked tack sharp in the live view and when I play it back in the camera and look at the it with a loupe it looks very sharp. However, when I play it back on my computer everything is blurry. I don't have a 4K monitor. could this be the reason? is there a trick to editing 4K? Please, help. thanks.