Arrow Group Industries LM86 Manual do Utilizador descarregar pdf (Página 19)

Maxwell Render 2.5 User Manual

Chapter 5. Cameras | 19

5.02 Optics

F.01 Optics

• Focal Length (mm): The focal length of the lens. Focal length is a measure of how

strong an optical system converges or diverges light. The effect of this parameter is

to “zoom” in on a portion of your scene as the focal length increases (from 100mm

and up it would be considered a “Tele-Photo” lens which acts more like binoculars),

or reveal more of your scene as the focal length decreases (20mm is considered a

“Wide-Angle” lens because it has a wide viewing angle – it can see more of your

scene). This parameter also controls the DOF (depth of eld) of the render. A wide-

angle setting means most of your scene will be in focus (a wide DOF), while a larger

focal length like 80mm means a smaller portion of your scene will be in focus (a

narrow DOF).

• Shutter (1/s): In photography, a shutter is a device that allows light to pass for a

determined period of time to expose photographic lm to the right amount of light to

create an image. The shutter speed or the time light has to reach the lm is specied

in 1/n of a second. A higher number means the light has less time to reach the lm.

• f-Stop: Controls the aperture of the lens. An important concept in optics, f-Stop

represents the diameter of the entrance pupil in terms of the effective focal length of

the lens. F-Stop is the quantitative measure of lens speed in photography. A smaller

f-Stop means the aperture (diaphragm) of the lens is more open, and higher f-Stop

values mean the aperture is more closed. This has the effect of letting more or less

light pass through the lens to reach the lm. It also affects the DOF of your render.

The smaller the f-Stop, the smaller the DOF, so only a small area of the image will be

in focus.

• EV number: This parameter computes the Exposure Value from the Shutter and

f-Stop values. You can also lock the exposure level in your render by using the Lock

Exposure checkbox, which will allow you to change any of the parameters while

keeping the same exposure level.

For a deeper explantion of these camera concepts please consult Cameras and Camera

Parameters secction.

Film Back

Focal Length (Lens size)

Angle of view (Field of view)

F.02 Camera concepts

F.03 The camera is pointing to the area of interest

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