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Photographer's Note

Second shot from Notre Dame. Prefer this with the slightly more graphical look to it.

Some people have mentioned the distortion (Phil & Ben), so this is what I think it was, no pp. The verticals were straight so no need for perspective control. This was straight out of camera. The distortion must be because of the change of axis to the film plane.

Some technical stuff:
Shift (rise and fall)
If you consider your camera pointing at a building, with the film/sensor plane perpendicular to the ground, the camera should be pointing to a point at the same height above the ground as it is positioned.

If you raise the lens, this aiming point moves away from the centre of the frame.

A simple example from landscape photography might help explain...

Lets say I want to take a scenic shot, with the horizon about one third of the way up the frame. If I just tilt the camera up to move the horizon down, it may not show much distortion. However if I've got tall trees or telegraph poles in the shot, they may start to lean at quite an angle. The solution is to shift the lens.

The sensor on my 1Ds is 36mm x 24mm. If I want to have the camera aim point moved down to 1/3 of the height of the frame I need a shift of 4mm (the centre line is 12mm from the bottom of the frame, I need it 8mm from the bottom 12- 8= 4mm) Similarly for portrait orientation I need 6mm of shift to get the horizon 1/3 of the way up the frame (18-12)



Any other suggestions welcomed ;D

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Additional Photos by Mark Nunnerley (marknunnerley) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 455 W: 50 N: 483] (2780)
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