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Module 1 Lab Report

Module 1 Lab Report - ENGR 101 Fall 2010 Freshman...

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ENGR 101- Fall 2010 Freshman Engineering Design Lab Reverse Engineering a Film Camera ENGR 101 Section 016, Group 11 Date: October 27, 2010 Submitted to: Caroline Schauer and Marjorie Austero Team Members: Abstract: The purpose of this lab was to reverse engineer a camera in order to alter its shutter speed. In this case, there was an attempt to shorten the shutter piece in order to create a longer exposure time. Initially, the exposure time of the camera at its default settings was measured on an oscilloscope to determine exposure length. Then, modifications were made to the original shutter design. The new design was prototyped, but when replacing the new with the altered version, it was discovered the new models of shutter and camera did not match. A different modified shutter was used, that matched the camera model, in an attempt to make the exposure time shorter. The new shutter’s exposure time was measured on the oscilloscope and compared to the original shutter duration. When the exposure times were compared, it was found that the new shutter actually made the exposure time longer, when it was intended to make it shorter. This was due to the fact that during experimentation, the spring that attaches to the shutter piece and controls its return was stretched, altering its pull on the shutter. With less tension, the shutter took longer to snap back, creating a longer exposure time. Conclusively, if the spring that attached to the shutter had not been altered, the new shutter most likely would have resulted in a shorter exposure time, due to the fact that the shutter piece was lengthened.
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ENGR-101, Fall 2010 Module 1 Final Report Section 016, Group 11 Introduction: Lab Purpose The purpose of reverse engineering is to be able to take an already made device and alter its core properties in order to better fulfill its function or fulfill a new function in a specific situation. The objective of this lab was to open up a disposable camera and change one or more of its core components in order to change the shutter speed. Shutter Speed and Picture Quality The speed of the camera shutter determines how long the film is exposed to light. A faster shutter speed means that less light is allowed to enter the camera, and pictures are more static. A slower shutter speed means that more light is allowed to enter the camera, and pictures are more blurred. Both sides of the spectrum have their advantages. For example, a fast shutter speed would be useful for capturing a freeze-frame picture of something such as a batter hitting a ball or a runner running down a track. A slow shutter speed, on the other hand, would be better for capturing something that would be more aesthetically pleasing if blurred, such as a stream of water.
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