1. Understanding Exposure
by Danny Perez Photography
Part 2: Aperture

2. Recap
The exposure is the amount of light received
by the film or sensor and is determined by how
wide you open the lens diaphragm (aperture)
and by how long you keep the film or sensor
exposed (shutter speed). The effect an
exposure has depends on the sensitivity of the
film or sensor.

3. The Exposure Triangle
It is better to be under exposed than over exposed!

4. Correct Exposure
✦ Right amount of light
✦ Balance of light and dark
✦ Light meter indicates correct exposure
✦ Combination shutter speed, aperture and ISO
✦ Can be 6 or more combinations
✦ Auto mode yields a “correct exposure”

5. Consider This...
1. ISO 100 f/4 1/500 sec.
2. ISO 100 f/5.6 1/250 sec.
3. ISO 100 f/8 1/125 sec.
All “correct exposures”
Which is best? It depends...

6. Creative Exposure
✦ Isolate a subject
✦ Blur your backgrounds
✦ Tell a story
✦ Show action
✦ Freeze action
by macrophile
It’s about finding the right combination of
aperture, shutter speed and ISO

7. Focus on Aperture
Using aperture to get creative exposures

8. What is the Aperture
by Erwin Bolwidt (El Rabbit)
A hole or an opening through which light passes.

9. Purpose of Aperture
by Beth-Kingery
Control the amount of light reaching
the film or image sensor.

10. Less is More
by Mehmetaergun via Wikimedia Commons
The smaller the f number, the large the opening
Full Stops 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, 45

11. What does this mean?
by Brian Lane Winfield Moore
I want to take pictures - how do I use this to my
advantage?

12. Amount of Light
In low light a fast lens will allow the
lens to gather more light.

13. Depth of Field
by lattiboy
I want to take pictures - how do I use this to my
advantage?

14. Creative Aperture
✦ Storytelling Apertures
✦ Singular-Theme Aperture
✦ “Who Cares” Aperture
Based on Bryan Peterson’s Understanding Exposure

15. Storytelling Aperture
✦ Sharp focus throughout
✦ A beginning, middle and end
✦ Landscapes
✦ Works best with wide angles
✦ Where to focus
by E_TAVARES
✦ Small aperture f/16, f/22, f/32

16. Singular-Theme Aperture
✦ Isolation of subject
✦ Portraits
✦ Flowers
✦ Telephoto lenses work best
✦ Large apertures f/5.6, f/4, f2.8
by Anderson Mancini

17. “Who Cares” Aperture
✦ “f/8 and be there”
✦ Use when depth of field is not a concern
✦ Subjects at same focal distance
✦ Sweet spot on elliptical glass
✦ Critical sharpness and great contrast
✦ f/8 and f/11
by Ian Muttoo

18. Bokeh
by Josh Liba
Aesthetic quality of the blur, in out-of-focus areas,
or "the way the lens renders out-of-focus points of light."

19. But How?
Turn the dial: aperture priority or manual mode

20. Demo Time
by msjacoby
Let’s try something fun

21. Question?
by e-magic
How? What? Where? When? Why?

22. Stay Tuned
Shutter speed coming up next