File talk:Aufnahme mit zwei Kameras.svg

Comments

I don't want to be nitpicking, but I felt something was wrong with the image. Its is very hard to get this right without 3D tools. I tried to draw from the centre of the lens of each camera a vertical line to the bottom of the camera. From there on, a line perpendicular to the focal plane of each camera, so the centre of the lens focus. Left camera line crosses the shadow of the ball in the middle, so OK. I took the assumption that the light casting the ball shadow was perpendicular to the ground plane. The right camera crosses more to the right of the ball centre (one third to one fourth of the ball size), but the camera should probably point a little bit more to the left (or the ball on the picture more to the left) (now 1/8th of the ball diameter). The right camera seems one eight closer than the left one, so the right picture should show bigger balls.

The grids are the most difficult, especially if you don't have the shadows as reference. On the photos, I drawed a vertical line crossing the ball centre. In the bottom centre of the left image, you should see a crossing of the ground tiles quite early in the image (depends on focal length objective), followed by the next crossing slightly left from the 45 degree's diagonal; that's quite different on the picture. The right camera focal line crosses first two corners of the grid, and then another two corners (difficult to explain), while on the photo, its completely different.

At least, this was my impression, followed by some sort of hand drawing exercise that confirmed my impression. You would be surprised how difficult it gets to get that right without 3D tools. Courage and good luck. --Foroa 17:20, 3 June 2008 (UTC)