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lenses
Lenses are characterized by their focal length (between the optical center and the film), aperture (ratio between the diameter of the lens and the focal length) and angle of view (width of the captured image).
lens accessories
All the parts that can be attached to a lens to change its focal length or alter the image projected on the film.
lens cap
Part that covers and protects the lens when it is not in use.
tele-converter
Component inserted between the camera and the lens to increase its focal length; this enlarges the image of a distant subject.
objective lens
Optical system made up of a set of lenses fixed on a mount; it allows a clear image to be produced on film.
polarizing filter
Glass used to reduce reflections from nonmetallic surfaces such as water, glass and asphalt.
close-up lens
Optical disk that changes the focal length of the lens so that very near subjects can be photographed.
color filter
Colored glass used to alter the characteristics of the light reaching the film.
lens hood
Cone-shaped device that reduces the effect of intense ambient light to improve the image’s contrast.
