I am absolutely new in photography. I own a Nikon D3300. My camera was working fine until I did some manual tuning to aperture, shutter speed, and many other things.
After those changes, my pictures are blurry when I try to zoom in. When I zoom out to the maximum level then 70% of the time the image is sharp. Also, in excellent light condition, it works fine with little zoom but when I try to zoom more it again becomes blurry.
I have no idea what I have done and how I can fix it. It behaves same in auto mode too.