Inverse Square Law
1) OVERVIEW: WHY USE FLASH?
2) THE INVERSE SQUARE LAW - What does it mean?
3) THE INVERSE SQUARE LAW Shoot
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1) OVERVIEW: WHY USE FLASH? (10:42)
1) OVERVIEW: WHY USE FLASH?
2) THE INVERSE SQUARE LAW - What does it mean?
3) THE INVERSE SQUARE LAW Shoot
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1) OVERVIEW: WHY USE FLASH? (10:42)
2) THE INVERSE SQUARE LAW - What does it mean?
The INVERSE SQUARE LAW concerns how the distance of a subject from a light source relates to the amount of illumination it receives.
The INVERSE SQUARE LAW concerns how the distance of a subject from a light source relates to the amount of illumination it receives.
The video below explains and demonstrates this principle in effect very well.
VIDEO TUTORIAL: INVERSE SQUARE LAW (12:15)
VIDEO TUTORIAL: INVERSE SQUARE LAW (12:15)
Assignment: INVERSE SQUARE LAW
See the student example below? That's basically your job.
You are to submit a single image that is actually a side-by-side compilation of six photographs of your partner at different distances from the backdrop.
CAMERA SETTINGS and HOW TO START THE SHOOT
- Start on P (Programmed Auto) mode. You'll switch to manual later.
- Ensure the flash is raised
- Shoot this in a dim studio area with a dark background.
- Have your subject stand directly in front of the backdrop.
- Frame their face tightly and take a couple of test shots.
- Once you're happy with the exposure, take note of your exposure settings, switch to M (Manual) mode, and dial in those setting manually. We don't want them to change once your subject starts moving!
- Take six images in a row, with both you and your subject taking one step away from the backdrop after each shot.
WHAT SHOULD YOU SEE?
Your subject's face should be exposed the same in all six images, provided you both moved the same distance after each shot. The backdrop, however, should fade from view as it gets further away from the light source (your flash).
The "fading" backdrop is demonstrating the Inverse Square Law.
See the student example below? That's basically your job.
You are to submit a single image that is actually a side-by-side compilation of six photographs of your partner at different distances from the backdrop.
CAMERA SETTINGS and HOW TO START THE SHOOT
- Start on P (Programmed Auto) mode. You'll switch to manual later.
- Ensure the flash is raised
- Shoot this in a dim studio area with a dark background.
- Have your subject stand directly in front of the backdrop.
- Frame their face tightly and take a couple of test shots.
- Once you're happy with the exposure, take note of your exposure settings, switch to M (Manual) mode, and dial in those setting manually. We don't want them to change once your subject starts moving!
- Take six images in a row, with both you and your subject taking one step away from the backdrop after each shot.
WHAT SHOULD YOU SEE?
Your subject's face should be exposed the same in all six images, provided you both moved the same distance after each shot. The backdrop, however, should fade from view as it gets further away from the light source (your flash).
The "fading" backdrop is demonstrating the Inverse Square Law.
HOW TO MAKE A FILMSTRIP IN PHOTOSHOP:
1) Open all files at once by going to File > Scripts > Load Files Into Stack. Select the files you want and open them.
2) Go to Image > Image Size. Take note of the width x height of your images (in pixels!).
3) Multiply the width number by 6.
4) Go to Image > Canvas Size. Change the width to whatever number you got in step 3. Be sure that the height and width aren't linked (you only want the width to increase, not the height.)
5) One by one, drag your layers to the proper spot (left to right).
6) Time to re-size this image, now that it's 6x bigger than we need. Go back to Image > Image Size and change the width to the original number you saw in step 2.
7) Save as a .jpg!
1) Open all files at once by going to File > Scripts > Load Files Into Stack. Select the files you want and open them.
2) Go to Image > Image Size. Take note of the width x height of your images (in pixels!).
3) Multiply the width number by 6.
4) Go to Image > Canvas Size. Change the width to whatever number you got in step 3. Be sure that the height and width aren't linked (you only want the width to increase, not the height.)
5) One by one, drag your layers to the proper spot (left to right).
6) Time to re-size this image, now that it's 6x bigger than we need. Go back to Image > Image Size and change the width to the original number you saw in step 2.
7) Save as a .jpg!