Title: canon / 03. AF and Drive Modes

Q: 3 types of AF operation
[...]
A: one shot AF
AI focus
AI servo

Q: [...] is suited for [...],. when you press shutter button halfway, camera will focus only once.
A: one shot AF; still subjects

Q: [...] AF operation is suited for [...], when the focusing distance keeps changing. while you hold shutter button halfway, camera will keep focusing on subject continously
A: AI servo; moving subjects

Q: [...] AF operation switches from [...] if subject starts moving.
after subject is focused in one shot AF, if the subject starts moving, camera will detect mobement, automatically change to AI servo, and start tracking moving subject.
A: AI focus; one shot AF to AI servo automatically

Q: camera has [...] AF points for autofocusing.
there are [...] AF area selection modes
[...]
A: 61; 7; 1. single point spot AF
2. single point F
3. AF point expansion
4. AF point expansion (manual selection, surrounding points)
5. zone AF
6. large zone
7. automatic selection AF

Q: = [...]
for pinpoint focusing
A: single-point spot

Q: = [...] AF
A: single-point
Extra: select 1 AF point to focus

Q: = [...]
A: AF point expansion
Extra: the single AF point and 4 adjacent points (above, below, left, right) are used to focus

Q: = [...]
A: AF point expansion surrounding points
Extra: 1 selected AF point and surrounding AF points are used to focus

Q: = [...]
there are [...] AF zones
A: zone AF; 9

Q: = [...]
there are [...] large zones (left, center, right)
A: large zone AF; 3

Q: = [...]
A: automatic selection AF
Extra: area AF frame (entier AF area) is used to focus

Q: you can manually select AF [...] or [...]
A: point; zone

Q: single-point Spot AF
fxn: [...]
complication: focusing may be difficult
[...]
A: pinpoint focusing on overlapping objects (animal in a cage); -handheld shooting
-moving subject

Q: AF point expansion
effective when [...]
A: its difficult to track a moving subject with just 1 AF point

Q: AF point expansion and surrounding points
focuing over [...] than AF point expansion (adjacent points)
effective when its [...]
A: wider area; difficult to track moving subject with just 1 AF point

zone AF
AF area is divided into 9 zones
all AF points in selected zone are used for AF point selection.
its superior to single-point AF, AF point expansion in achieving focus
its effective for moving subjects
complication:
difficulty focusing on a specific target bc its inclined to focus on nearest subject

Large zone AF
divides AF area into 3 focusing zones: left, center right
superior to single-point AF & AF point expansion in tracking subject
effective for moving subjects
complication: 
difficulty focusing on a specific target

Q: automatic selection AF
the area AF frame (entire AF area) is used to focus
with one-shot AF, halfway shutter press will display AF points <square> that achieved focus. this mode tends to focus on [...]
with AI servo AF, you can set AI servo AF's initial position. as long as Area AF frame can track subject during shooting, focusing will continue
A: nearest subject

AF configuration tool is a feature that allows you to fine-tune AI servo AF characteristics to suit a particiular subject or scene, by selecting an option from 6 cases
there are 6 cases setting combinations of "tracking sensitivity", "acceleration/ deceleration tracking" , and "AF point auto switching"

Q: drive mode
[...]
A: 1.single
2.high speed continous
3.low speed continous
4.silent single
5.silent continous
6.self timer/ remote 10sec
7.self timer/remote 2sec

Q: Drive modes
 = [...]
= [...]
 = [...]
A: high speed continous shooting
maxinum ~7shots/sec; low speed continous
max 3shots/sec; silent continous
max 3shots/sec + suppress mechanical sound

Q: when using selftimer to take selfie, use [...] on an [...]
A: focus lock; object at same distance as where you will stand

Q: case1: [...]
fxn: any moving object
choose alternative cases for the following:
[...]
A: versatile multi purpose; 1.obstacle cuts across AF points
2.subject tends to stray from AF points
3.want to focus on subject appearing suddently
4.speed of moving subject changes suddently
5.subject dramatically moves horizontally or vertically

Q: case2 = [...]
when obstacle cuts across AF points, or subject strays from AF points, camera will try to continue focusing on subject
effective when
[...]
A: continue to track subjects, ignore possible obstacles; 1.obstacle blocking subject
2.u dont want to focus on background

case1= for any moving subject
case2= tennis players, butterfly swimmer, freestyle skier
case3= starting line of a bicycle race, alpine downhill skiers
case4= soccer, motor sports, basketball
case5= figure skating
case6= rhythm gymnastics

Q: [...]= tennis players, butterfly swimmer, freestyle skier
A: case2

Q: [...]= soccer, motor sports, basketball
A: case4

Q: [...]= figure skating
A: case5

Q: [...]= rhythm gymnastics
A: case6

Q: difficult subjects to autoFocus
[...]
A: 1.subjects with very low contrast
(blue sky, solid color flat surface)
2. in very low light
3.strongly backlit, or reflective subjects
(cars w/ highly reflective bodies)
4.near & distant subjects framed close to AF point
(animals in cage)
5.subjects such as dots of light framed close to AF point (night scenes)
6.subjects w/ repetitive patterns
(skyscraper windows, computer keyboards)
7.subjects w/ finer pattersn than AF point
(faces or flowers as small as/ or smaller than an AF Point)

Q: in cases when autofocus fails due to difficult subjects to focus, you have 2 options
[...]
[...]
A: 1. one-shot AF, focus on object at same distance as target, lock the focus, recompose; 2. Manual focus