Would like to hear from experienced and professional photographers. What you usually set in your DSLR? Aperture or Shutter Speed? Or control over both - Manual mode. I'm new to DSLR. From some of photography tutorials, I heard that if I control Aperture and letting the Camera to set Shutter speed, I can make some excellent photos, except certain cases.. Is this right? As a beginner, can I keep ISO on auto? Thanks in advance.