To diopter or not diopter

If you use a stronger dipoter then you will simply limit the maximum focus to a closer point - this may or may not be a problem depending on what you are doing, BUT as you get closer it becomes ever harder to achieve decent foreground corners and you have to stop down more to help this. Also wide-angle lenses rarely perform at their best at close focus so focusing close, adding a strong diopter and a small aperture will all take their theoretical optical toll. However in the real world its best to be aware of how things operate and then go out and work from there. You may find that for some of the things you want to take, it is possible to experiment until you get a satisfactory result. What is more difficult is NOT getting a good result and not understanding why.