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sjbuckner1
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i've always wondered about putting motion blur on the cars, do they really become that blurry to the camera going 25-35mph?

 

It all depends on the shutter speed of the camera, which in turn is related to the film speed (ISO rating). If you take a shot of a moving object with fast film, say ISO 400+ then you can use a fast shutter speed as the film will have been exposed to enough light in that short period of time, so the moving object will be sharp and "still". If you took the same shot with a slow film, say ISO 64, then the shutter would need to be open for a longer period and a moving object will appear blurred against a still background. To this, the film speed, shutter speed and aperture are all affected by the light levels of the scene you're shooting.

 

Considering that photographers generally prefer a slower film speed if possible (giving more colour and contrast with a finer grain), odds are that a moving car will have some blur.

 

There's much more to it, but that's the general relationship. If you're taking reference shots, make notes of the ISO, shutter and film speed along with a note about the light level (eg full sun, midday, summer), that way you can take an educated guess when setting up cameras in 3D based on the background plate/ assumed time of day.

 

Hope this helps,

 

S.

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