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Understanding Exposure
Part 2: Aperture
by Danny Perez Photography
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.
The Exposure Triangle
It is better to be under exposed than over exposed!
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”
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...
Creative Exposure
✦ Isolate a subject
✦ Blur your backgrounds
✦ Tell a story
✦ Show action
✦ Freeze action
It’s about finding the right combination of aperture, shutter speed and ISO
by macrophile
Focus on Aperture
Using aperture to get creative exposures
What is the Aperture
by Erwin Bolwidt (El Rabbit)
A hole or an opening through which light passes.
Purpose of Aperture
by Beth-Kingery
Control the amount of light reaching the film or image sensor.
Less is More
by Mehmetaergun via Wikimedia Commons
The smaller the f number, the large the openingFull Stops 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, 45
What does this mean?
I want to take pictures - how do I use this to my advantage?
by Brian Lane Winfield Moore
Amount of Light
In low light a fast lens will allow the lens to gather more light.
Depth of Field
I want to take pictures - how do I use this to my advantage?
by lattiboy
Creative Aperture
✦ Storytelling Apertures
✦ Singular-Theme Aperture
✦ “Who Cares” Aperture
Based on Bryan Peterson’s Understanding Exposure
Storytelling Aperture✦ Sharp focus throughout
✦ A beginning, middle and end
✦ Landscapes
✦ Works best with wide angles
✦ Where to focus
✦ Small aperture f/16, f/22, f/32by E_TAVARES
Singular-Theme Aperture
✦ Isolation of subject
✦ Portraits
✦ Flowers
✦ Telephoto lenses work best
✦ Large apertures f/5.6, f/4, f2.8by Anderson Mancini
“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
Bokeh
Aesthetic quality of the blur, in out-of-focus areas, or "the way the lens renders out-of-focus points of light."
by Josh Liba
But How?
Turn the dial: aperture priority or manual mode
Demo Time
Let’s try something fun
by msjacoby
Question?
How? What? Where? When? Why?
by e-magic
Stay Tuned
Shutter speed coming up next