Sensitivity means the degree to which photographic emulsion reacts to a light source. Fast film such as ISO 1600 has greater sensitivity than slow film such as ISO 100.
Shutter
A camera shutter is a moveable cover for the lens and its aperture. It controls the length of time that light travels through the aperture opening to hit the film. When it is closed, the shutter is designed to block light from traveling through the lens and reaching the film. When the shutter is open it lets light strike the film. Camera shutters are made of small blades, a curtain, a plate or another type of movable cover.
Shutter Speed
The shutter speed sets the length of time of an exposure. A faster shutter speed means a quicker exposure time. A shutter speed of 1/400th of a second is faster than a speed of 1/50th of a second. A faster shutter speed will freeze the action. It is recommended for most sports.
Slow Film
This is film that has a lower sensitivity to light such as ISO 50 or lower.
Slow Lens
A slow lens has a narrow maximum aperture such as -?/8, whereas a fast lens may have a maximum aperture of 2.8.
Strobe
In photography, strobe or strobe lighting generally refers to an electronic flash unit. However, a strobe is also a short form for stroboscope or stroboscopic lamp which is a quick, intermittently flashing light source.
