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Comparison Tecsar AHDW-20F3M-light vs Tecsar AHDW-3M-20F-light

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Tecsar AHDW-20F3M-light
Tecsar AHDW-3M-20F-light
Tecsar AHDW-20F3M-lightTecsar AHDW-3M-20F-light
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Mountoutdooroutdoor
Body typebeamedbeamed
Connection
BNC
BNC
Camera features
Design and features
light sensor
IR illumination
light sensor
IR illumination
Illumination range20 m20 m
Matrix
ModelAptina AR0330Aptina AR0330
Matrix typeCMOSCMOS
Matrix size1/3"1/3"
Number of megapixels3 MP3 MP
Video resolution2048x1536 px2048x1536 px
Aperturef/2.0
Lens
Focal typepermanentpermanent
Focal length3.6 mm3.6 mm
General
Power source12 В12 В
Operating temperature-20 °C ~ +60 °С-20 °C ~ +60 °С
Maximum humidity95 %95 %
Materialplasticplastic
Dimensions62x62x160.8 mm62x62x160.8 mm
Weight380 g380 g
Color
Added to E-Catalogdecember 2017march 2017

Aperture

Aperture of the lens installed in the camera.

Aperture characterizes the degree of attenuation of the light flux when passing from the front lens of the lens to the matrix. It is denoted as the ratio of the diameter of the active aperture of the lens to the focal length, while the size of the active aperture is designated as f and is taken as a unit — for example, f / 1.4 or f / 2.0. Moreover, the smaller the number in the designation, the higher the aperture (in our example, the second lens will be darker than the first). And for lenses with a variable focal length (see "Focal"), the actual aperture, usually, changes with a change in focal length; for such models, either the range of aperture values, or its maximum value, can be indicated.

By itself, this parameter characterizes, first of all, how light the image taken through the lens turns out, all other things being equal. High values are important, first of all, when shooting in low light conditions: a fast lens allows you to get a fairly high-quality image without increasing the sensitivity of the matrix, which is fraught with noise and “blurring” of the picture. On the other hand, the actual quality of camera operation (including in dark conditions) also depends on many other factors — the type and size of the matrix, signal processing features, etc. Therefore, aperture in most cases is more of a reference than a practically significant parameter.
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