spherical aberration
... lens designs in the presence of decentration. J Cataract Refract Surg. 2005 Mar;31(3):574-85. 2: Bellucci R, Morselli S, Piers P. Comparison of wavefront aberrations and optical quality of eyes implanted with five different intraocular lenses. J Refract Surg. 2004 JulAug;20(4):297-306. 3: Packer M, ...
... lens designs in the presence of decentration. J Cataract Refract Surg. 2005 Mar;31(3):574-85. 2: Bellucci R, Morselli S, Piers P. Comparison of wavefront aberrations and optical quality of eyes implanted with five different intraocular lenses. J Refract Surg. 2004 JulAug;20(4):297-306. 3: Packer M, ...
spherical aberration
... lens designs in the presence of decentration. J Cataract Refract Surg. 2005 Mar;31(3):574-85. 2: Bellucci R, Morselli S, Piers P. Comparison of wavefront aberrations and optical quality of eyes implanted with five different intraocular lenses. J Refract Surg. 2004 JulAug;20(4):297-306. 3: Packer M, ...
... lens designs in the presence of decentration. J Cataract Refract Surg. 2005 Mar;31(3):574-85. 2: Bellucci R, Morselli S, Piers P. Comparison of wavefront aberrations and optical quality of eyes implanted with five different intraocular lenses. J Refract Surg. 2004 JulAug;20(4):297-306. 3: Packer M, ...
Increasing the Resolution of Far
... microscope focuses accelerated electrons rather than light. The de Broglie wavelength of the electrons can be as small as 0.005 nm and is easily controllable by an acceleration voltage of typically 50-100 kV so that the wave nature of the electrons does hardly play a limiting role. Presently, electr ...
... microscope focuses accelerated electrons rather than light. The de Broglie wavelength of the electrons can be as small as 0.005 nm and is easily controllable by an acceleration voltage of typically 50-100 kV so that the wave nature of the electrons does hardly play a limiting role. Presently, electr ...
Modeling Moiré: Visual Beat Effects in Nature and Optical Metrology
... a new, magnified pattern emerges from the varying overlap of two original patterns. Beat effects can also manifest themselves as striking visual patterns called “moiré patterns.” These patterns are a mathematically intriguing phenomenon with a wide range of applications, and the subject of this res ...
... a new, magnified pattern emerges from the varying overlap of two original patterns. Beat effects can also manifest themselves as striking visual patterns called “moiré patterns.” These patterns are a mathematically intriguing phenomenon with a wide range of applications, and the subject of this res ...
Methods of measuring the modulation transfer function
... that the two-dimensional OTF is rotationally symmetrical, and that, in the absence of noise due to film granularity, the imaginary part is zero; it is therefore adequate to specify only the modulus of the OTF, the modulation transfer functiont (MTF). Unfortunately, most photographic emulsions have n ...
... that the two-dimensional OTF is rotationally symmetrical, and that, in the absence of noise due to film granularity, the imaginary part is zero; it is therefore adequate to specify only the modulus of the OTF, the modulation transfer functiont (MTF). Unfortunately, most photographic emulsions have n ...
Binoculars - shapes and lenses
... The Premium Class , 3 – 2-plus , $900 and up This class features THREE-element objective lenses, for more uniform focus of the colors, and two-element eyepiece lenses with special “aspheric” / “field flattener” shapes to get sharp focus across the full field of view. This produces a noticeably impro ...
... The Premium Class , 3 – 2-plus , $900 and up This class features THREE-element objective lenses, for more uniform focus of the colors, and two-element eyepiece lenses with special “aspheric” / “field flattener” shapes to get sharp focus across the full field of view. This produces a noticeably impro ...
Aberrations
... A 50 mm diameter, f/8 lens has 2 waves of third-order spherical when it is illuminated with a collimated beam of HeNe light (l = 633 nm). a) What is the diameter of the geometrical image of a collimated beam at paraxial focus? b) How many waves of defocus should be added to give the minimum geometri ...
... A 50 mm diameter, f/8 lens has 2 waves of third-order spherical when it is illuminated with a collimated beam of HeNe light (l = 633 nm). a) What is the diameter of the geometrical image of a collimated beam at paraxial focus? b) How many waves of defocus should be added to give the minimum geometri ...
Theory and Practice of Scanning Optical Microscopy - X
... spread function, the M's resulting in a magnification M in the image, and the positive sign in the argument of the spread function corresponding to an inverted image. Of the two complex exponential terms in (2.57) the first is a constant phase term which therefore does not affect the image. The seco ...
... spread function, the M's resulting in a magnification M in the image, and the positive sign in the argument of the spread function corresponding to an inverted image. Of the two complex exponential terms in (2.57) the first is a constant phase term which therefore does not affect the image. The seco ...
F-number
In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography. The number is commonly notated using a hooked f, i.e. f/N, where N is the f-number.