Shallow Depth of Field examples

Assignment: "Shallow Depth of Field" Mar. 18 - April 1 '09

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Continuing on with some basics in photography, this week's subject is "Shallow Depth of Field". If you're still unsure of what this entails, be sure to read some of these posts in the DPS blog.
This is the one I tried:

As always comments and criticisms are welcomed.

EXIF DATA:

Date Taken: March 20th, 2009
Camera: Canon EOS Digital Rebel XSi
Exposure: 0.005 sec (1/200)
Aperture: f/5.6
Focal Length: 55 mm
ISO Speed: 1600
Exposure Bias: 0 EV
Flash: Off

Camera: Nikon D90
Exposure: 0.001 sec (1/1250)
Aperture: f/5.6
Focal Length: 22 mm
ISO Speed: 200
Taken on March 24, 2009

This was taken from the top floor of a parking garage. The original image was entirely in focus. So I used photoshop in an attempt to create a shallow depth of field and to try for that tilt-shift model type effect.

Exif:
Taken on: 25.03.09
Camera: Nikon D200
Lens: Nikon 50mm f/1.8
Exposure:1/250
F stop: f/2.8
Iso Speed: 250
Exposure Bias: -3 step
Flash: No flash
Metering Mode: Spot

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Camera: Nikon D200.
Lenses: Sigma 18-50mm F/3.5-5.6 DC / Nikon 50mm f1.8 D AF /sigma 24-70mm f/2.8 EX DG Macro / Nikon 70-300mm f/4.5-5.6G IF-ED VR/ Sigma 50-500mm f/4-6.3 EX DG HSM/ Kenko DG Teleplus Extension Tube Set ( 12 mm, 20 mm, and 36 mm )

Exif:
Caméra: Nikon D300
Exposition: 0,008 sec (1/125)
Aperture: f/1.6
Longueur focale: 50 mm
Exposition: 0.00
Vitesse ISO: 250
Détection du degré d'exposition: 0 EV
Flash: No Flash

Camera: Nikon D300
Exposure: 0.001 sec (1/800)
Aperture: f/1.8
Focal Length: 50 mm
Exposure: 0.00
ISO Speed: 200
Exposure Bias: -1/3 EV
Flash: No Flash

Tree Swirl
Camera: Canon PowerShot A590 IS
Exposure: 0.001 sec (1/1250)
Aperture: f/2.6
Focal Length: 5.8 mm
ISO Speed: 80
Exposure Bias: 0 EV
Flash: Off