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2 A B C D E F G H I K L M N O P R S T U V W

CS-Mount

Standardized interface for the mounting of lenses, described in ISO 10935 (1996-12) Optics and optical instruments – Microscopes – Interface Type CS

The diameter of the thread is 1 “(one inch) and there are 32 threads to 1” in length.

The distance between the mechanical stop of the lens and the sensor in cross bolts in air is 12.52 mm. These are about 5mm less than for C-mount lenses.

C-mount lenses can (with an 5mm extension (C-CS-mount adapter))  be used in CS-mount cameras,

However CS mount lenses can not be used in C-mount cameras.
CS-Mount lenses are mostly used in security systems, often these are wide-angle lenses.

 

Depth of Field

range in working distance for which the image is (acceptably) focused.

Image: Depth Of Field

Depth Of Field

DOF =  Far Point – Near Point

The largest depth of field (namely infinity) we get when we focus the lens to the so called hyperfocal distance. The focus extends from H/2 to infinity.

see also Bokeh


dispersion

(from latin dispergere, “to scatter”, to disperse” ) :

Dependency of a measure on frequency / wavelength.

Light_dispersion_conceptual(C) Wikipedia, zum Animieren bitte klicken

Using a Prism dispersion leads to splitting of white light beam into individual colors. A rainbow where light takes different paths inside the water dropplets, depending on their wavelength is another “real world” example of dispersion.

Every optical medium / glass type has different refraction indices for the various wavelength of light. The number that describes how different the light paths of the various wavelengths are, is the Abbe-number.

UNder dispersion formulas you find the most common formulas

Dispersion Formulas

Each optical material (glasses, plastics, gases) have a different refraction index for each wavelength.

Instead of keeping long tables, it’s possible to describe the behaviour of optical materials by formulas.

here are the main formulas used :

1: Sellmeier (preferred)
n^2-1=C_1 + \frac{C_2 \lambda^2}{\lambda^2-C_3^2} + \frac{C_4 \lambda^2}{\lambda^2-C_5^2} + \frac{C_6 \lambda^2}{\lambda^2-C_7^2} + \frac{C_8 \lambda^2}{\lambda^2-C_9^2} + \frac{C_{10} \lambda^2}{\lambda^2-C_{11}^2} + \frac{C_{12} \lambda^2}{\lambda^2-C_{13}^2} + \frac{C_{14} \lambda^2}{\lambda^2-C_{15}^2} + \frac{C_{16} \lambda^2}{\lambda^2-C_{17}^2}

2: Sellmeier-2
n^2-1=C_1 + \frac{C_2 \lambda^2}{\lambda^2-C_3} + \frac{C_4 \lambda^2}{\lambda^2-C_5} + \frac{C_6 \lambda^2}{\lambda^2-C_7} + \frac{C_8 \lambda^2}{\lambda^2-C_9} + \frac{C_{10} \lambda^2}{\lambda^2-C_{11}} + \frac{C_{12} \lambda^2}{\lambda^2-C_{13}} + \frac{C_{14} \lambda^2}{\lambda^2-C_{15}} + \frac{C_{16} \lambda^2}{\lambda^2-C_{17}}

3: Polynomial
n^2 = C_1 + C_2 \lambda^{C_3} + C_4 \lambda^{C_5} + C_6 \lambda^{C_7} + C_8 \lambda^{C_9} + C_{10} \lambda^{C_{11}} + C_{12} \lambda^{C_{13}} + C_{14} \lambda^{C_{15}} + C_{16} \lambda^{C_{17}}

4: RefractiveIndex.info
n^2 = C_1 + \frac{C_2 \lambda^{C_3}}{\lambda^2-{C_4}^{C_5}} + \frac{C_6 \lambda^{C_7}}{\lambda^2-{C_8}^{C_9}} + C_{10} \lambda^{C_{11}} + C_{12} \lambda^{C_{13}} + C_{14} \lambda^{C_{15}} + C_{16} \lambda^{C_{17}}

5: Cauchy
n = C_1 + C_2 \lambda^{C_3} + C_4 \lambda^{C_5} + C_6 \lambda^{C_7} + C_8 \lambda^{C_9} + C_{10} \lambda^{C_{11}}

6: Gases
n-1 = C_1 + \frac{C_2}{C_3-\lambda^{-2}} + \frac{C_4}{C_5-\lambda^{-2}} + \frac{C_6}{C_7-\lambda^{-2}} + \frac{C_8}{C_9-\lambda^{-2}} + \frac{C_{10}}{C_{11}-\lambda^{-2}}

7: Herzberger
n = C_1 + \frac{C_2}{\lambda^2-0.028} + C_3 (\frac{1}{\lambda^2-0.028})^2 + C_4 \lambda^2 + C_5 \lambda^4 + C_6 \lambda^6

8: Retro
\frac{n^2-1}{n^2+2} = C_1 + \frac{C_2 \lambda^2}{\lambda^2-C_3} + C_4 \lambda^2

9: Exotic
n^2 = C_1 + \frac{C_2}{\lambda^2-C_3} + \frac{C_4 (\lambda-C_5)}{(\lambda-C_5)^2 + C_6}