Exercise: Focus at different apertures
This exercise is similar to the previous one: three photographs of a subject that shows a row of things at an angle. I tried it with railings, and also with the balustrades on this bridge at Stowe. The idea is to take photographs of the same subject form the same place, but changing the aperture, from the widest to the smallest (photography 1, p.33). I took five photos, and here are three of them: the widest, the middle one, and the smallest one.
Click on the photos to view a larger image.
Click on the photos to view a larger image.
Image 1
Model: Canon EOS 600D
ISO Speed Rating 320
Exposure Time 1/80 sec
Shutter Speed 1/82 sec
F-stop f/36
Aperture Value f/36
Focal Length 49.00 mm
Model: Canon EOS 600D
ISO Speed Rating 320
Exposure Time 1/80 sec
Shutter Speed 1/82 sec
F-stop f/36
Aperture Value f/36
Focal Length 49.00 mm
Image 2
Model: Canon EOS 600D
ISO Speed Rating 100
Exposure Time 1/100 sec
Shutter Speed 1/99 sec
F-stop f/16
Aperture Values f/16
Focal Length 49.00 mm
Model: Canon EOS 600D
ISO Speed Rating 100
Exposure Time 1/100 sec
Shutter Speed 1/99 sec
F-stop f/16
Aperture Values f/16
Focal Length 49.00 mm
Image 3
Model: Canon EOS 600D
ISO Speed Rating 100
Exposure Time 1/800 sec
Shutter Speed 1/790 sec
F-stop f/5.60
Aperture Values f/5.70
Focal Length 49.00 mm
Model: Canon EOS 600D
ISO Speed Rating 100
Exposure Time 1/800 sec
Shutter Speed 1/790 sec
F-stop f/5.60
Aperture Values f/5.70
Focal Length 49.00 mm
The OCA materials explain that there should be an obvious difference between the first and the last one, and ask you to mark with a pencil the limits of sharpness in the different images. I found this quite difficult to do, but I think in the first image most of the balusters are in focus, whereas in the third image, only the ones closer to the viewer are in focus.