Canon EOS Rebel T1i Manuale rapido - Pagina 2

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Movie Recording Size Options (continued)

In Movie Crop mode (Rebel T2i/EOS 550D only)

you can achieve 7x magnification when shooting SD

video for a significantly increased telephoto effect.

This mode crops the image directly from the sensor at

640x480 resolution, providing good image quality and

a highly magnified view of distant subjects. It's best to

mount the camera on a tripod to avoid a shaky image.

Frame Rate Options

The following frame rates are available on all video-

capable EOS DSLRs (except the Rebel T1i, which

offers either 20 fps at 1080 HD or 30 fps at SD and

720 HD):

• 24 fps (23.98 actual) – This provides a more

"film-like" effect, however, rapid motion will not

be as smooth as with 30 fps.

• 25 fps – This is the standard rate for video

broadcast in Europe and other PAL standard

countries. Your camera's Video System menu

must be set to PAL.

• 30 fps (29.97 actual) – This is the standard

rate for video broadcast in the U.S and other

NTSC standard countries.

• 50 fps – This is the standard frame rate for

720p HD video broadcast in Europe and other

PAL standard countries.

• 60 fps (59.94 actual) – This faster rate gives

motion a very smooth look and can be easily

edited down to 30 fps for playback on DVDs or

on the web.

In general, North American users should choose

either 30 fps or 60 fps for smooth results and easy

transition to the most popular playback methods.

Picture Styles and White Balance

Video recording will apply whatever Picture Style and

white balance settings your camera is set to. Raw

mode is not available. For optimum quality you should

therefore adjust the white balance to the prevailing

light source and adjust the Picture Style to your

subject or preference.

Exposure Options

Automatic Exposure with Auto-ISO

All EOS DSLRs with movie mode allow automatic

exposure with AE Lock and AE Compensation. The

EOS 5D Mark II with firmware version 2.0.4 also

provides Av/Tv functionality. Keep in mind, however,

that normal variations in scene and subject brightness

can cause undesirable exposure fluctuations during

recording. Many pros prefer full Manual Exposure

because exposure will stay consistent, even when the

camera moves or the light changes.

Manual Exposure with Auto-ISO

This option provides a fixed shutter speed and

aperture while allowing the ISO to move up or down

in response to changing light levels. Keep in mind,

however, that similar to automatic exposure with auto-

ISO, you lose control over how the camera responds

to changes in subject brightness. Also note that higher

ISOs lead to higher signal noise.

Manual Exposure with Fixed ISO

In this mode the exposure is "locked in." This is ideal

for when light levels are consistent, less so when they

are not. Manual exposure gives you the added benefit

of being able to used a fixed shutter speed, which

should be approximately twice the frame rate. For

example, if your frame rate is 30 fps, an ideal shutter

speed would be 1/60 second. You can then set your

aperture accordingly. If this requires an aperture

smaller than what is available on your lens or if you

prefer to use a larger aperture for a more shallow

depth-of-field, place a neutral density (ND) filter over

the lens. Depending on how dark a filter you choose

you can reduce incoming light by up to four stops.

Focusing Options

Although EOS DSLRs

with HD video allow

autofocus, the focusing

speed will be slower

than if you were doing

still photography with the

optical viewfinder. Also

note that although it is

possible to autofocus

during video recording, AI Servo AF is not available.

Many pros therefore prefer to pre-focus before

shooting and to focus manually if necessary during

shooting. Remember to set the focus switch on your

lens to "MF" when focusing manually.

Sound Options

All EOS DSLRS with HD video have a built-in

microphone that will allow you to record sound

simultaneous with video. This includes an automatic

gain feature that attempts to amplify all sounds it

hears to the same level. (The EOS 5D Mark II with

firmware v. 2.0.4 allows you adjust audio levels

manually.) You should therefore avoid autofocusing

or handling the controls while recording because the

microphone will pick up the noise and amplify it. It's

also a good idea to be as close to the sound source

as possible and to avoid areas that have a lot of

unwanted background noise.

All EOS DSLRs except the Rebel T1i have a

stereo audio jack that allows you to attach an external

microphone. You also have the option of using a

separate digital audio recorder and adding audio

during editing.