Paper Sensitometry

Paper Sensitometry - M&P Workshop Paper Sensitometry...

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( p 110-119) Name Nicole Formisano Section 4 Lab Partners Dina Yang Paper Sensitometry Objective : 1. To draw D-Log H curves for three different photographic paper sensitometric strips. 2. To determine D min and D max for each curve and use this information to determine Density Ranges. 3. To determine the Log Exposure Range of each curve. 4. To calculate ANSI Paper Speeds for each curve. 5. To compare these data with published data. Required: 1. Sensitometric Data from different paper samples. 2. A graphing program such as Excel. Part I – Exposure and Processing Information In the workshop, the negative was a 21-step tablet. The paper used was Kodak Ektamatic SC Paper . Each strip received the same initial exposure, but please take note of the following: Sample A: White-light exposure and stabilization processing Sample B: Poly-contrast filter exposure and stabilization processing Sample C: Poly-contrast filter exposure and tray processing Calculate the log exposure received by the 21st step of each strip with the following procedure: 1. Lux incident at the film step table 16 lux 2. Exposure time in seconds 25 sec 3. Exposure incident at film step tablet 400 lux-sec 4. Log exposure incident at film step tablet 2.60 Log H 5. Density of step 21 on step tablet 0.1 6. Log exposure for the 21st step of the paper 2.50 Log H (Answer 4 – Answer 5) 1 of 7
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Part II D-log H Curves Determine the Log Exposure for each step, using the value from #6 as a starting point. The Log H changes by 0.15 for each step. Plot a D-Log H curve for each strip on the same sheet graph using with the paper provided or Excel. Reflection Densities Strip A Strip B Strip C Base + Fog 0.01 0.01 0.01 Step Step Table Density Log H 1 3.1 -.5 2 2.95 -.35 0.03 3 2.8 -.2 0.04 0.03 4 2.65 -.05 0.06 0.04 5 2.5 .10 0.11 0.08 6 2.35 .25 0.23 0.18 7 2.2 .40 0.38 0.37 8 2.05 .55 0.59 0.60 9 1.9 .70 0.81 0.03 0.90 10 1.75 .85 1.10 0.04 1.26 11 1.6 1 1.37 0.08 1.72 12 1.45 1.15 1.64 0.21 1.98 13 1.3 1.30 1.79 0.42 2.10 14 1.15 1.45 1.89 0.76 2.10 15 1 1.60 1.91 1.12 2.10 16 0.85 1.75 1.94 1.49 17 0.7 1.9 1.95 1.72 18 0.55 2.05 1.95 1.84 19 0.4 2.2 1.91 20 0.25 2.35 1.91 21 0.1 2.50 1.93 2 of 7
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D-Log H Curves 0 0.5 1 1.5 2 2.5 -0.5 0 0.5 1 1.5 2 2.5 3 Log H Strip A, White-light exposure and stabilization processing Strip B, Poly-contrast filter exposure and stabilization processing Strip C, Poly-contrast filter exposure and tray processing 3 of 7 Base + Fog (.01) Lux incident at the film step table: 16 lux Exposure time in seconds: 25 sec Log exposure incident at film step tablet: 2.6 Paper Type:
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Paper Sensitometry - M&P Workshop Paper Sensitometry...

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