Week 14 - Revision

Most of the test will be multiple choice


Studio 
Power Packs
-The power output from a power pack looks like a spike on a graph.

How to we measure the flash duration?
(look up t0.5)

What is the problem with using t.5?
it represents quite a bit of light, so if you have moving subjects you may still get blur because they will be moving while there is still light. So using T0.1 is more accurate because it measures a greater amount of light.

What if we fire a flash at half the power output
How? Mono blocks or

However, you never reach enough kelvin to get a blue light so the light will be very yellow the whole time.
What does it look like on a graph? The same, but half as high

If you have one flash at full power and one at half then you will encounter color balance issues. This is fixed by complicated devices inside quality flashes.  Or you can use a lower output and chop the flash duration off.


How does the color of the flash  change over the flash duration?
At maximum intensity the light is blue
When starting off, the light is red-orange and as it drops off it returns to this.


-Control of color temperature (read handout)
(Wont ask about what buttons to press)
-Medium format digital cameras
-Close up photography and macro (need to understand the geometry about how it works)
-chrome and glass and shiny objects (the basic concepts behind how you would approach those type of subjects)
-Large format cameras - color calibration (how to calibrate camera sinar back)
DSLR calibrating (instead of printing a target you photograph a target)
Copy work (types of lighting - two lights 40 degree angel)


Printing technology


Soft Proofing


Colourimeter and spectrophotometers 


HDR - why do we use it? what is the purpose? (Not how-to) 


Main topic for the semester is color management 
Working spaces
Color spaces


Scheimpflug 
(large format camera movements)


example question: 
if i tilt the film plane 12 degrees what would the plane of focus look like?
|                 \       =            \  
sensor       lens                 film plane

|                      /     =            /

(look up schimpflug example)
(look up the effect of tilting the lens a certain way)

limitations of a tilt shift lens comapred to a large format camera:
(look up)




Camera calibration
-need even lighting
-calibrated camera is important for accurate copy work
When is it NOT useful? when the light is changing, so you only need to calibrate for a very controlled situation.
-photograph test target, feed into eye one and then it creates a profile to put on your camera of can be applied to the images during editing.



Macro
Theory
1 to 1 means the subject in the image is the same size as the subject in real life.