I have trained thousands of students for photography.
Out of my training experience I’ve realized that many a times the camera user is never able to see anything sharp through the viewfinder. There could be many reasons for this but one of the MOST OVERLOOKED reason is ignoring the diopter adjustment of your camera according to your vision. In fact this is so overlooked that even many conditioned photographers dont know about it.
What happens when the diopter is not adjusted to your vision ?
Simple you might not be able to seee your subject sharp enough and you will never be satisfied during shooting.
How to avoid this issue?