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Introduction To Engineering Camera Lab #2 - 2. Agenda Open cameras, remove batteries, discharge capacitors, and disassemble/reassemble ! Sketch critical elements of the shutter mechanism Estimate Shutter speed from photos of bike wheels. Important notes:. Each group must record data

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## Introduction To Engineering Camera Lab #2 - 2

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**Introduction To EngineeringCamera Lab #2 - 2**Agenda Open cameras, remove batteries, discharge capacitors, and disassemble/reassemble ! Sketch critical elements of the shutter mechanism Estimate Shutter speed from photos of bike wheels**Important notes:**• Each group must record data • Make sure one person in each group gets all the data! • Make sure data is given to all group members**Measuring Blur Angle**Measure the blur angle (q ) with a protractor**Estimating Shutter Speed**• Measure the blur angle (q) with a protractor • The radius of the wheel is r • The bicycle traveled at 15 mph. Convert this to in/sec.**Estimating Shutter Speed**• The amount of travel per revolution is The angular speed is given by If qis the blur angle in degrees, the fraction (f) of a revolution is**Estimating Shutter Speed**• The time (t ) for the wheel to move the fraction (f ) of a revolution for a constant angular speed is related to f by: The time (t ) is expressed in the formula:**12**(13) t = = 0.010 sec = 10 milli sec sec , 15 100 Estimating Shutter Speed • The speedometer actually measures the angular velocity of the wheel axis. It assumes a wheel diameter of 26” to convert to ground speed. Therefore, use r = 13 in and assume θ = 12 deg;**Making the Camera Safe**• Pry open the five snap fits that hold the back cover: both ends, top, bottom, back. • Remove the back case, and take out the battery. Note battery orientation (+ down)! • If the front cover falls off, put it back on without touching any part of the circuit board**Making the Camera Safe**• Wind the shutter release by rotating the blue wheel until it stops. • Press shutter release to trigger the flash. • Take off the front case, and hand the camera to the instructor. Don’t touch anything on the circuit board, especially the small black can! • The instructor will touch a screwdriver across capacitor leads to discharge the capacitor. • The camera is now safe to handle.**Front of Camera**Snap to release lens assembly Capacitor Capacitor leads**Shutter Cocked for Picture**Pivot allows shutter to rotate open when arm moves to right.**Shutter Open**Spring tab connected to circuit board Contact between shutter and bar completes flash trigger circuit Brass bar connected to circuit board**Summary of Lab Steps**• Remove back of camera, remove battery, wind and release shutter/flash; have instructor discharge capacitor. • Measure blur angle, compute shutter speed, and record value. • Disassemble and reassemble camera with emphasis on shutter mechanism. • Sketch critical elements of shutter mechanism.**Assignment**• Read Camera Lab 2 materials CAREFULLY!!

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