Technical controls P3 (b)

My reasoning for setting the exposure as aperture priority and then putting the aperture to f/22 is so that it will let very little light    

  

f22 lets in less light - greater depth of field 

White Balance


In photography and image processing, color balance is the global adjustment of the intensities of the colors (typically red, green, and blueprimary colors). An important goal of this adjustment is to render specific colours – particularly neutral colours – correctly; hence, the general method is sometimes called gray balance, neutral balance, or white balance.