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Sensitometry - 14209_281
Densitometry

Photography (Basic) - Introduction to photography and other graphic techniques
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Figure  10-26.–Densitometer  with  both  transmission  and  reflection capabilities. Figure  10-25.–Step  tablets. daylight balanced xenon flashtube. It can also produce exposure  times  from  1/100  to  1/10,000  second. Step Tablets A sensitometer is set up to make only one exposure. In order to provide a range of exposures, a step tablet is placed between the light source and the light-sensitive material. The step tablet is a strip of neutral-density filters in equal increments, ranging from 0.05 to 3.05. This range provides a 10 f/stop range. The most common step  tablets  are  as  follows  (fig.  10-25): 1.   21-step   tablet-1/2   f/stop   between   each increment. 2.  11-step  tablet-1  full  f/stop  between  each increment. Courtesy of X-Rite, Inc. 302.339X Control  Strips A sensitometric control strip should be processed as a minimum-at the beginning of a production day (or shift), before any production is processed, and before shutdown. You should process a control strip just before an important mission, or a special-interest film is processed. To expose and process a control strip, you should take  the  following  steps: 1. Take the film (in a lighttight container) and place 2. Turn on the sensitometer and allow it to warm 3. Turn off the room lights. 4.  Place  the  film  emulsion-side  down  on  the 5. When hand processing or using a rotary tube 6. When a roller transport processor is used, check 7. Stick the film into the processor so the lightly it next to the sensitometer. up for a minimum of 15 seconds. sensitometer  and  lower  the  platen  to  make  your exposure. type of processor, load the control strip on the reel. When machine processing, replace the film in a lighttight container. Turn on the room lights and turn off the sensitometer. the   speed,   temperatures,   and   the   proper operation  of  all  systems. exposed end of the film enters the machine first. When hand processing or using a rotary tube type  of  processor,  process  normally. 10-40







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