3D Printing

I recently came across really beautiful photograph of the Eiffel tower by Robert Doisneau. It was really amazing shot and I immediately knew that it was the start of my another side quest. 

Upon close inspection one can notice that there are three regions where the Eiffel tower is stationary, top, middle, and bottom. Which lead me to assume there was a sort of back and forth motion of the camera, like a half sine wave. But there is more to it, a simple back and forth motion alone cannot create such image. There also has to be a rectangular slit which will only allow certain part of the scene to be projected on the film, like a one dimensional line-scan. And this horizontal scanning line have to traverse vertically in sync with the back and forth motion of the camera.

You may be wondering we do have shutters in camera. Why don't use them? Well yes you can use them but you need super human reflexes to capture such image. The vertical shutters would acts as a line scanner at high shutter speeds say 1/1000 sec. That means the camera have to be moved in sync with the shutter at a blazingly fast speed. Moreover, the camera has to move twice as fast as the shutter. This brings to the reasonable approach, external shutter.

Far from perfect, the prototype was still an awesome tool. The front plate can be attached to the lens like a filter. 

Currently, I am WoRkInG to include a mechanism to assist in moving the slider evenly throughout the entire exposure. Basically, a gear mechanism which will convert the rotational motion of a knob to the linear translation of slider. Along with this an improved design to securely lock front and back plates.