I am debating if I should upgrade to a full frame camera or not. I heard that full-frame cameras are less forgiving if there is camera shake? My worry is that my pictures might not be as sharp with the full frame if I do not have a lens with image stabilisation. I would like to understand why a full frame would be less forgiving to shake than a smaller APS-C sensor.
I can understand that sensor with higher resolution will be less forgiving to shaking because you can zoom in more on the details but that is a megapixel factor. To make my question more precise, if I had two 15 megapixel cameras and one was a full frame and the other APS-C and if they both had the same 50 mm lens, will there be any difference in sharpness if there is a little shake factor? Will the full-frame camera be less forgiving?