gumboot
lorcutus.tolere
- Joined
- Jun 18, 2006
- Messages
- 25,327
Wow, the alignment of objects with each other does not change! How about that! I never noticed that before.
Thanks alot guys!![]()

Assuming the grey oval is the mushroom cloud, the white and red barns are as located, and the blue square is Val's house.
In each example (the "yellow photo", "orange photo" and "blue photo") the thin line is the edge of frame whilst the thick line is the alignment to the edge of the mushroom cloud.
Now.
Note that in the yellow one, the edge of the mushroom cloud and the corners of the barns line up. If you widen the frame edge lines on this same photo position (which equates to using a lower focal length, or wide angle lens) the mushroom cloud vectors are the same. If you narrow the frame edge lines from the same position (which equates to a higher focal length, or "long lens") the mushroom vectors also remain the same.
However, if we select a wider lens angle (lower focal length) such as the "blue photo" notice, in order to keep the far corners of the barns at the edge of frame (thin line) we have to come much closer. As a result, the mushroom cloud and the inner corners of the barns nolonger match up.
Likewise, with the "orange photo" we have a longer lens with a narrower lens angle. To retain the barns at the edge of frame we have to move away from the subject. And again, the mushroom clouds and barns nolonger line up.
-Andrew