HIGH SPEED/TIME LAPSE SAMPLE EXAM 2010-11 NAME: 01. A TV set writes how many lines per second? 02. How many degrees per second does a 33 1/3 RPM turntable cover? 03. Assuming that at 1/1000 second a focal plane shutter's slit measures 2 mm at a given location across the gate, at 1/250 second the slit will measure how many millimeters? 04. With a focal plane shutter, exposure time is defined by what relationship? 05. If all you had was a digital or film camera how would you go about determining the flashing rate of a flashing light source such as a fluorescent tube? 06. Write the relationship that describes how the velocity of a moving object is defined. 07. Describe the reason that focal plane shutters sometimes introduce distortion in images recorded by them. 08. In order to determine the velocity of some subject based on blur why must the blur not extend beyond the edges of the frame? 09. A moving object becomes its own shutter in a manner of speaking. Explain. 10. A picture is made at an exposure time of 1/100 second with a full frame DSLR or 35 mm film camera equipped with a leaf-shutter and a 50mm lens. The picture that you make of a 1 foot square subject appears as an image that is twice as long as it is tall. From this you can deduce that the subject was moving at what speed? 11. Henri Lartigue made a photograph that exploited focal plane shutter distortion. What was the subject of the photograph? 12. As objects fall they seem to pick up speed. Why? 13. How far does a subject moving at 1000 feet per second move during an exposure time of 1/100 of a second? 14. What was the rotation rate of this seed given that the exposure time was 1/4 second? 15. How fast was the seed falling? 16. Write the decimal form of 1/1,000,000 second. 17. When one measures rotation rate of a subject the measurement is independent of image magnification. TRUE   or   FALSE    Circle choice and explain: 18. If a subject is moving at 100 feet per second appears blurred in an image made of it at 1/1,000 second (which is the top speed of the camera) changing to a shorter focal length lens will make the image detail sharper. TRUE    or     FALSE  Circle choice and explain: 19. The power in joules or watt/seconds of an electronic flash depends primarily on two electrical factors. What are they? 20. In order for an image to appear imperceptibly blurred, the degree of blurring must not be any larger than what? 21. Who was Harold Edgerton? 22. What is the approximate speed of sound? 23. If one disconnects the main capacitor from a flashtube during the discharge cycle, what happens to the duration and light output of the flash? 24. If an electronic flash circuit is able to handle the change, then what is the major effect of doubling the voltage of the circuit? 25. Moving a sound synchronizer's microphone 1 foot further away from the source of sound will add about how much delay to the next photograph? 26. What are the limits between which the duration of electronic flashes is usually determined? 27. This is the record of a bullet in flight made with an electronic flash. What is the reason for the appearance of the highlight blur? 28. What is an intervalometer? 29. How much time should elapse between exposures in a time lapse sequence if the event of interest lasts 12 hours and you want to make it last 20 seconds at a projection rate of 30 pictures per second? 30. Given a playback rate of 30 pictures per second what is the framing rate at a Time Magnification of 1/100X? 31. To compress time by a factor of 10, what should the Time Magnification be? 32. Edward Muybridge is known for doing what? 33. The 3 most desirable characteristics of high speed cameras are:      1.     2.     3. 34. To achieve the highest recording speeds in both film and digital cameras manufacturers ultimately compromise on what? 35. If you have a CF card with a capacity of 1 Gb how many pictures each requiring 1 Mb can you store on it before running out of space on the card? 36. To record at 1,000 frames per second and higher with film cameras what is introduced between the lens and the image plane and what is its function? 37. Explain how digital high speed cameras make records that after capture allow one to appreciate events leading up to the event of interest. 38. What should the aperture of the lens be if one wishes to properly adequately record a scene illuminated by 6400 foot candles and one is using 100 ISO sensitivity sensor and an exposure time of 1/1000 second? end