Computational Exam

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Code Completion Credits Range Language Instruction Semester
304TCHP Z 1 Czech summer

Subject guarantor

Name of lecturer(s)

Learning outcomes of the course unit

The aim is to practice photometric, exponometric and sensitometric calculations.

Mode of study

Instructor assigned exercises, independent graph development, report submission.

Prerequisites and co-requisites

Completion of the course „Fundamental Camera work“. Theory basis in photography, exponometry, the color process and the film lab.

Course contents

Example 1:

How much light does the given density allow::

0,3 - 0,75 - 0,9 - 1,15 - 2,0 - 1,7 - 0,15 - 0,35 - 1,8 - 2,8 - 3,0. Calculation executed without a table and calculator on a simple given known value /0,3 - 1,0 - 0,15 etc./

Example 2:

What is the density of the stratum, which allows the given amount of light:

1/4 - 1/8 - 1/16 - 1/32 - 1/5 - 1/3 - 1/6 - 1/2 - 1/10 - 1/15 - 1/14. If the precise result is not achievable, it is sufficient to determine a value between the nearest known highest and lowest numbers.

Example 3:

Exposure conditions without a filter: screen 16, speed 25 shots/s. We arrange a grey filter with density x. How much must we change the exposure? Establish the filter factor /3a/, how to execute the change of the exposure conditions by the change of screen /3b/, change in speed /3c/. What will the exposure period be in a speed change in a 180°, 110° and 45° sector /3d, 3e, 3f/.

Example 4:

Exposure conditions: screen x, speed y, 180°. We request a phote with a screen 2. How do we execute exposure change o of the sector /4a/, How to arrange the grey filter/determine the factor - /4b/, How to change the speed /4c/.

Example 5:

Value 1, sensitogram completed with a sensitometer with a film constant 0,15 are 0,30 - 0,32 - 0,36 - 0,40 - 0,45 - 0,56 - 0,65 - 0,73 - 0,82 - 0,90 - 0,98 - 1,08 - 1,15 - 1,24 - 1,32 - 1,40 - 1,48 - 1,52. Veil 0,30.

On a second sensitogram: 0,06 - 0,06 - 0,06 - 0,06 - 0,07 - 0,18 - 0,32 - 0,62 - 1,08 - 1,50 - 1,95 - 2,37 - 2,80 - 3,20. Veil 0,06.

Execute both characteristic arches, determine the value of steepness. Determine the difference in sensitivity of both materials /in log. exposure/, according to 0,1over the veil, according to 0,85 over veil. Sensitivity difference place in log H.

Example 6:

Values according to sample 5. Execute a construction copy so that a 0,1 negative 1. sensitogram achieves 2,00 in positive /2, sensitogram/. Then determine the straight line copy number /one copy number 0,05/ construct the copy arch on 1,2,3,4 numbers of density and 1,2,3,4 thinner. Verbally explain what happens in enlarging and reducing the copy exposure.

Example 7:

What is the growth in density in the slope value 0.65, growth in the logarithm of exposition x /7a/?

What is the exposition logarithm growth in the slope value 0.65, when ther is a growth in the value y /7b/?

What is the slop value, when the growth exposition log growth 0,3 correspond to the value z /c/?

This is always a straight part characteristic, mark on the characteristic arch how to execute the calculation.

Example 8:

Distance between light source points and the photocell is 100cm. The photo cell displays 1000lx. How many cm must change the distance so the photocell displays value x lx.

Example 9:

A negative film is exposed in sensimeter with a film constant 0.2. It has density 0,3 - 0,32 - 0,36 - 0,40 - 0,48 - 0,58 - 0,70 - 0,83 - 0,98 - 1,11 - 1,25 - 1,40 - 1,52 - 1,62 - 1,70. Veilj 0,3. Execute a construction of the internal veil when the exposure value of the veil in lux-seconds equal x% of the exposture value of the densest field.

Example 10:

Exposition lighting is 500lx. In slope 0,65 the corresponding density is 1,10. What will the density be in lighting Ex?

Example 11:

How far must the source be when the actor lighting on a rail x meters long change not more than twice/lighting closest to the source must be double the lighting of the farthest position/?

Example 12:

On a figure, produce a source with distance x meter of lighting 1000lx. The corresponding screen is 2,00. What screen do you set up when you add supplementary lighting to the figure made up of the same source in a distance of y meters /12a/. What is the average lighting on the figure? /12b/.

Recommended or required reading

See the syllabus for „Basic Photography Theory“ and „Exponometrics.“

Assessment methods and criteria

Credit is awarded based on the submission of a report and sensitometric graphs.

Course web page

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Further information

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