EDIT: also, I would like to measure the lighting..
You can do what you want with a level, a plumb bob and a measuring tape. In addition you need to establish reference points on the camera, etc. to measure from. The plumb bob establishes a point directly below the camera. The level ensures the table is level. You measure the height of the camera and the distance along the table to the object.
Basically, by reducing the problem to vertical and horizontal distances, you can well define the geometry.Leonhttp://homepage.mac.com/leonwittwer/landscapes.htm..
It's important to know where the sensor is in the camera, rather than where some specific part of the lens is, because lenses move during focusing, etc..
On some cameras, there is a little line with a circle in the middle of it, indicating the focal plane, which is where the film or the sensor is..
I just looked on my Canon XT; there is no line on it, but it is easy enough to estimate..
CAre to tell us why you need all the math, instead of just setting it up and looking?.
To measure light, the two easiest ways are to use a handheld incident light meter, held over by the book, or to use a grey card, placed where the book is, and use the in-camera built in exposure meter, with exposure set on M for Manual..
On some cameras, there is a little line with a circle in the middleof it, indicating the focal plane, which is where the film or thesensor is..
I just looked on my Canon XT; there is no line on it.
Is too. It's on the top of the camera, left side of the viewfinder hump, at the base of the hump..
You can see it pretty clearly in the first picture below:.
Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window..
Find a few ABFO rulers to place in the photograph... they allow measurements, as well as the ability to correct for minor distortion caused by the imaging plane being not-perpendicular to the subject..
If you know the math involved, the rest is fairly easy..
There are software solutions available that claim to be able to perform all sorts of measurements from a photo... no names off the top of my head, sorry. They tend to be very expensive..
Crime Scene PhotographyA small gallery of personal work: http://picasaweb.google.com/PID885..
Next time I look, I'll turn the light on..
Just checked, and it's returned, after having left for a while this afternoon..