CRI 198 M6

• Normal Lens - 45° to 75° usually standard equipment on a camera
• Wide Angle Lens - 60° to 90° it has a shorter focal length
• Telephoto Lens -  less than 45° it has a longer focal length it utilize a focal length
• Focal Length it is the distance measured from the optical center of the lens to the film plate when the lens is focused at infinity position
• Achromatic Lens - design to correct chromatic aberration which causes colors to focus at different points
• Rapid Rectilinear Lens - is a combination of two chromatic lens design to develop to minimize optical operation
• Anastigmatic Lens -  free from astigmatism or other types of lens defect
• Process Lens - corrected lens for astigmatism
• Fixed Focus Lens -  used in all fixed focus camera it is basically has a short focal length and a great depth of field
• Macro Lens -  design with extended focusing capabilities to shoot few inches from a subject
• Zoom Lens - it allows a quick adjustment to give a wide or narrow field of vision
• Spherical Aberration - the focusing at the different point of rays passing through the different parts of spherical plates the image is blurred
• Chromatic Aberration -  the failure of different colors light rays to focus after passing through a lens
• Astigmatism -  it is the inability of the lens to bring horizontal and vertical lines in the subject
• Coma - occurs when the light falling obliquely on the lens and passing through different circular zones
• Curvature of Field - a curve concave or saucer shape image of an object which has a flat surface
• Distortion -  the inability to produce the same enlargement
• Mechanical Flare - film is draining spot or bright spot on the film because of stray light
• Light Loss - most corrected lenses are quoted with the substance which will reduce one type of flare
• Stray Light - it can be reduced or eliminated by using the proper lens
• Camera -  nothing more than a light tight box with a pinhole or a lens shutter at one end and a holder of synthesized material at the other
• Aperture -  in optics it is defined as the opening of a lens through which light can enter
• Diaphragm -  changes the size of the aperture of the
• Magnification -  the size of the image formed by the lens
• Fast Lens -  with high lens speed used during night or in dark
• Slow Lens - with slow speed using during daytime or where the room is bright
• Focus -  means by which the object distance is estimated or calculated to form sharp images
• Focusing - is the setting of the proper distance in order to form a sharp image
• Auto-Focus - intelligently adjust the camera lens to obtain focus on the subject
• Manual Focus - the type of lens that is characterized by simply turning the focusing ring by hand
• Camera Lens Aberration -  is an imperfection in the way a lens focuses light
• Super Wide Angle - an ultra wide angle lens that is designed for shooting wide angles generally 180°
• Angle of View - the amount of the scene shown on a given size of feed
• Optical Flare - it is a result of double reflection from the inner lens surface
• Hyperfocal Distance - is the nearest distance at which a lens is focus with the given particular diaphragm opening which will give the maximum depth of field
• Depth of Field - is the distance measured from the nearest to the farthest object
• Simple Miniscus Lens - usually found in a simple camera comprises a single piece of glass