Andy, I read:
ORIGINAL: AndyKunz
Cees,
One of the beauties of photography is lenses. You also NEED to know the lens geometry and the position of the lens relative to the subject in order to do what you're trying.
For instance, if I use a lot of light, I get a very large depth of field (area in which my subject is in focus). I get a very sharp image. Unfortunately, that can distort the subject, especially as the subject and camera are closer. You can easily end up with a tapered wing where the tip close to you measures the same (or even WIDER) than the root, while the other wing panel looks like it has extreme taper.
I do close-up photography all the time, and it's something you ALWAYS need to consider when composing a photograph. The photo of the fuse in the box was not well-composed, especially not for what you're trying to do.
You can get decent measurements if your subject is far away and only a small portion of the FOV.
Again, you CANNOT do what you attempted without knowing ALL the geometry: lens diameter, focal length, distance to subject, and angles of lens to subject. I wish you could.
Andy
Andy,
I understand you are worried.
But be not afraid not only Daniel Bernoulli and Anthony Fokker are helping me.
Also Gemma Fricius the Dutchman, I will show you in this post, see picture 1
Explanation
About the picture 1.
In the past I did get the very important high resolution picture of the “Box of Pandora” the crate of Africa.
The picture is made by Ed Kazmirski.
I cannot find any distortion of the straight lines of the crate and they are all over the picture! So there is no measurable pincushion distortion or barrel distortion. It is just like the picture is made with a Camera Obscura. No wide angle or telephoto lense is used.
Camera Obscura1
Gemma Fricius, Dutchman 1508 – 1555 did make the first drawings of the Camera Obscura.
The result of a picture with the camera obscura is an exact copy of the example.
Characteristic of these pictures is there is no distorsion, bended lines are bended lines, straight lines are straight lines. No lenses are used in this camera (like the pinhole camera).
About the picture 2
The picture of the crate is taken on a very sunny moment of the day so with a little diaphragm hole, the result is, the picture is sharp in any detail. Also the distances all are within a ratio of about 1:2 so little difference in depth. I did show the hinges of the ailerons in the past!
Because I do not see any corner shading or flare, we see the camera and lens must have been of very high quality and we all know that from Ed Kazmirski.
Inverted Camera Obscure 2
To reconstruct the drawing I did use the inverted method of the Camera Obscura.
The result of a picture with the camera obscura is an exact copy of the example.
When I use the inverted method the result will be the same, no distorsion.
I do not use one hole between the example and the copy but a mask with a lot of holes between the laser and the copy drawing. I can do this because a laser beam is never bended.
The laser is on the place of the pinhole of the camera obscura and the mask between the laser and the copy drawing.
The mask does not have to be a mirror image for this reason! See the beaming on first posts of the thread.
Rest the accuracy?
As accurate I can make the mask with an industrial high resolution plotter and the position of all the parts!
Check?
If I want I make a high quality picture of a second crate with my planes I can check with the master picture by photo shopping.
If I invert my method again I have again the Camera Obscura and I can make from the crate a new mask, just change the laser in a hole and make a mask behind the hole!!
If I want a second plane, after making a crate picture and corrections (in mm’s!), it is possible!
Conclusion!
I do not have to and will not stop until I have my Wester Taurus, even if you say:
“Again, you CANNOT do what you attempted without knowing ALL the geometry: lens diameter, focal length, distance to subject, and angles of lens to subject. I wish you could”
Because I know I can and because all I do is the best for YOU.
The picture 2 I show, is the result of the test I did for you, a fast check to find the right positions and angle so I have 5 parallel lines.
More to follow. Cees,