There doesn't seem to be much difference at all. hmmmm...
I think shooting through a door (if you were as dlaf suggested) that your camera is taking that extra surface and using it to help focus... which could explain why everything behind it is the same each time.
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Canon 450D (Rebel Xsi)
Canon EFS 18-55 mm , Canon Zoom EF 75-300mm
Canon Powershot S5 IS
CP&UV filters; Hoya ND 8; +1, +2, +4, +10 Close Up; 4 pt & 8 pt star filters
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