Objective: This exercise will show the effect of a range of shutter speeds on the image; i.e 1/800 down to 1/6 second, while recording movement past a fixed viewpoint.
Location: I chose a busy dual carriageway and photographed moving vehicles at speeds of between 50 -70 mph from a layby.
Camera settings: My camera was set on manual mode and fixed onto a tripod. I adjusted the shutter speed for each exposure starting at 1/800s down to 1/6s and adjusted the aperture manually using the in built exposure meter. I did this to experience using the meter as I have only previously used manual mode in the studio with an off camera flash meter. The exposure information is shown below each frame.
3733: 1/400s f5. Again, the blur is more apparent and the patterns of the wheel hubs are starting to distort with the speed of the wheels.
3743: 1/80 f11. Vehicles are starting to leave a distinct trail as the shutter speed decreases.
3746: 1/50s f14. Definite elongation of the blur at this speed.
3747: 1/25s f20. Notice how the wheel hub details have produced a repeated pattern below the vehicle.
3751: 1/15 f25 (minimum aperture at this ISO). Very few details are discernable, apart from the colour.
3756: 1/8s f22. (to use a slower shutter speed I had to change the ISO from 400 to 100 for this shot) At this speed it was also difficult to catch the car in the frame.
3762: 1/6s f32. To achieve minimum aperture for this lens (18-200mm zoom) and a shutter duration of 1/6s, I had to increase the focal length from 26mm to 55mm. At 1/6s, the vehicle is virtually transparent and elongated beyond the field of view.
What did I learn? A short shutter duration will render a moving object sharp and a progressively longer one will blur the moving object in direct relation to it's duration. I also learned more about my camera's manual exposure controls, the way I could vary the ISO setting to make use of the smaller apertures and about the relationship of the maximum and minimum aperture to the focal length settings of a zoom lens.