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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

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
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
Measuring Blur Angle

Measure the blur angle (q ) with a protractor


Estimating shutter speed
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 speed1
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 speed2
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:


Estimating shutter speed3

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
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 safe1
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
Front of Camera

Snap to release lens assembly

Capacitor

Capacitor leads



Shutter cocked for picture
Shutter Cocked for Picture

Pivot allows shutter to rotate open when arm moves to right.


Shutter open
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
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
Assignment

  • Read Camera Lab 2 materials CAREFULLY!!


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