Reference Guide

ManualsBrandsCanon ManualsDigital CameraEOS 1

page

_

10

PROGRAM

SHIFT

Because

there

are

times

when

even

the

Intelligent

Program

setting

may

be

inappropriate

for

certain

subjects,

selected

EOS

cameras

(EOS-l,

630,

and

620)

offer

the

alternative

of

Program

Shift.

This

adjustment

is

made

by

turning

the

main

input

dial

while

in

Program

mode.

The

exposure

value

remains

the

same,

but

the

shutter

speed

and

aperture

settings

shift

up

or

down

simultaneously

in

I

step

increments.

The

shifted

settings

are

cleared

and

reset

to

normal

6

or

8

seconds

after

the

last

time

the

photographer

touches

the

shutter

release.

SECOND

CURTAIN SYNC

Originally

offered

in

1986

with

the

T90

and

300TL,

Second

Curtain

Sync

is

used

for

special

effects

with

slow

shutter

speeds.

By

causing

the

flash

to

fire

at

the

end

of

the

exposure

rather

than

at

the

beginning,

it's

easy

to

create

artistic

blur

effects

with

moving

subjects.

The

main

difference

compared

to

standard

First

Curtain

Sync

is

that

the

blur

trails

the

motion

of

the

subject

rather

than

preceding

it.

Second

Curtain

Sync

is

most

effective

when

used

with

either

Shutter

or

Aperture

Priority,

and

it

can

also

be

used

when

the

camera

is

set

to

Manual

mode.

It's

a

standard

feature

on

the

300

EZ,

420

EZ,

and

430

EZ

Speedlites,

and

is

only

available

with

the

EOS

620, 630,

650,

and

EOS-l.

Second

Curtain

Sync

is

not

possible

in

Program

mode,

or

when

the

flash

is

used

off-camera.

STEPPING

MOTORS

The

advantage

of

a

stepping

motor

is

that

the

precise

positioning

of

its

rotor

(the

turning

element)

can

be

controlled

by

electrical

signals.

As

with

conventional

electro-magnetic

motors,

stepping

motor

operation

is

based

on

the

mutual

repulsion

between

magnets

on

the

rotor

and

the

stator

(a

stationary

component).

As

the

name

suggests,

the

manner

in

which

power

is

applied

to

the

coils,

and

subsequently

the

stator,

causes

the

rotor

to

advqnce

a

step

at

a

time,

just

like

the

second

hand

on

a

watch.

The

amount

of

movement

can

be

precisely

determined

in

steps,

making

it

well

suited

to

digital

pUlse-count

control.

In

the

EOS

system,

both

the

Arc

Form

Drive

(AFD)

and

the

Electro-

Magnetic

Diaphragm

(EMD)

contain

stepping

motors

as

their

drive

power

source.

TTL FLASH

AE

When

the

EOS

620,

630, 650,

or

EOS-l

is

set

to

Manual

mode,

TTL

Flash

AE

is

possible.

In

this

mode,

the

photographer

selects

both

shutter

speed

and

aperture,

and

flash

output

is

automatically

controlled

off

the

film

plane.

Usable

distance

ranges

are

automatically

displayed

on

the

420

&

430

'

EZ

data

panels.

The

built-in

flash

of

the

EOS

750

and

the

l60E

Speedlite

operate

in

TTL

mode

only.