The term 'SPEED SETTING' can be broken down into two crossword solutions: BUS (3 letters) and FSTOP (5 letters). BUS stands for 'Business Unit Software', which is a software system used to manage business operations. FSTOP stands for 'F-number', which is a measure of the size of the aperture in a camera lens. The aperture affects the amount of light that passes through the lens, and thus affects the speed of the shutter. Therefore, the term 'SPEED SETTING' refers to the combination of BUS and FSTOP, which are used to control the speed of the shutter.