Tuesday, 11 November 2008

TAoP Project 3

Here are the images for project 3. This was to show the depth of field (from this point on I will refer to this as DOF) using different apertures. I've shot in B&W as it made it a little easer to see the effects of the aperture changes. Also I used a tripod and manual focus so I could ensure the same crop and focus point (the centre beam) each time.

Shot 1: f2.8, 1/4, iso400, 125mm

This showed a really narrow band of sharpness.

Shot 2: f8, 2", iso400, 125mm

A slightly larger band of sharpness.

Shot3: f16, 8", iso400, 125mm

Nearly all of the image is in focus but it still has a slight blur to the far edges.

Shot4: f32, 30", iso400, 125mm

Everything in focus, though at the cost of a 30 second shutter speed.

Here are the images again with the area of sharpness mapped out. running from f2.8-f32:

As I've mentioned before (project 2), the overall extremeness of the effects of these aperture changes change with the size/angle of lens and distance from the subject. The closer you are/tighter you focus the more dramatic the effect of the large aperture and small DOF. I'd like to look at this further to gain a greater understanding of how this works. I understand that setting a low f stop will give me a nice sense of depth and a hight f stop an overall sharp image, but I'm not entirely sure of the science behind it, yet! Hopefully this will come with practice or maybe further on in the course...

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