02. How many degrees per second does a 331/3 RPM turntable cover?

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1 HIGH SPEED/TIME LAPSE SAMPLE EXAM 2009 NAME: 01. A TV set writes how many lines per second? 02. How many degrees per second does a 331/3 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 velocity of a moving object is defined. 07. Describe the reason that focal plane shutters sometimes introduce distortion in images recorded by them.

2 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 fullframe 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. Terminal velocity refers to what? 13. As objects fall they seem to pick up speed. Why? 14. How far does a subject moving at 1000 feet per second move during an exposure time of 1 microsecond?

3 15. What was the rotation rate of this seed given that the exposure time was ¼ second? 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 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 sharper. TRUE or FALSE Explain: 19. The power in joules or watt/seconds of an electronic flash depends primarily on two electrical factors. What are they?

4 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?

5 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. 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? 29. To compress time by a factor of 10, what should the Time Magnification be? 30. 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? 31. Given a playback rate of 30 pictures per second what is the framing rate at a Time Magnification of 1/100X? 32. One dimension of the record captured with a streak camera is distance. What is the other one?

33. In a streak camera loaded with 35mm film the film is moving at 35,000 mm per second. A subject that moved at right angles to the film motion leaves a 45 degree trace across the width of the film.

6 33. In a streak camera loaded with 35mm film the film is moving at 35,000 mm per second. A subject that moved at right angles to the film motion leaves a 45 degree trace across the width of the film. How fast was the image of the subject moving? 34. The slope of a line running across the film in a film type streak camera is an indication of what? 35. If the film in a film-type streak camera is moving at 1000 inches per second and there is a streak running parallel to the edges of the film that is 5 inches long associated with a very small light source, what does the 5 inch long streak indicate? 36. Why is a rotating drum type streak camera considered to be always alert to recording light emitting subjects? end

Alternative velocity measurement techniques in synchroballistic photography

Rochester Institute of Technology RIT Scholar Works Articles 2004 Alternative velocity measurement techniques in synchroballistic photography Andrew Davidhazy Follow this and additional works at: http://scholarworks.rit.edu/article