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We carry top quality lenses, not inexpensive plastic optics which may give a distorted view. We feel so confident in our selection of Professional Surveillance Lenses, that we back them with a 1 - 3 year warranty (please see individual models for warranty information).
Things to know when selecting CCTV Security Camera Lenses?
Lens Format: lenses are categorized according to image size.
The
format of the Lens (1", 1/2", 1/3", 1/4")
is derived from the diameter/size of the imager. Usually lenses are
matched to the lenses format of the camera. Most of our professional
security cameras use 1/3" or 1/4" format.
Manual Iris: lenses of this type are mainly used for indoor environments where lighting conditions are controlled and consistent. The iris opening (F-Stop) can be set in a fixed position to control the amount of light entering the camera.
Auto Iris: mainly used in areas where lighting conditions vary over a 24 hour time period (outdoor or indoor use where light changes through open doors, windows, etc). An auto iris lens offers
the best performance in these conditions because the iris aperture automatically adjusts as the lighting changes.
DC Drive: The DC voltage from the
camera powers the auto iris lens by opening and closing the iris. Auto
Iris lenses get
their power directly from the camera through a 4-pin rectangular plug on
the back or side of the camera (shown here).
Lens Types: Board Lens, Fixed Focal Lens, Varifocal Lens, IR Corrected, Megapixel/High Definition
- Board Lenses are used in dome and case cameras to obtain a fixed field of view. These lens
can easily be switched in order to obtain a wider view (2.8) to a
longer range view (12mm). Please remember there is a limitation of
what lens size can fit within a dome case.
- Fixed / Monofocal Lenses are
one of the simplest type of CCTV Security Camera Lenses. Typically used for "box cameras" where a fixed field of view is desired. We carry a range from 1.9mm (fisheye lens) to 16mm (long distance lens). The larger the lens size, the more narrow
the field of view will be in.
- Varifocal Lenses
offer more flexibility and are the preferred lens choice by CCTV installers.
A varifocal lens that is 2.8 - 12mm allows for a field of view that can
be adjusted manually to achieve the optimal view needed.
- IR Corrected Lenses: used with Day& Night Cameras. Many natural light sources contains infrared light. This amount of infrared light changes as the light source changes during a 24 hour period. The result can be a blurry, unfocused picture at night if a Non-IR lens is used. An IR Corrected Lens helps minimize light dispersion over 24 hours which results in a focused image both during the day and at night. This eliminates the need to re-focus a camera lens at night or when using IR Illuminators.
- Megapixel / High Definition Lenses: In order to achieve the full resolution of a megapixel camera, it is essential to use a high quality megapixel lens. The overall image quality displayed is affected by the quality of the optical image captured onto the image sensor. Megapixel lenses provide high contrast, brightness and sharpness across the entire image plane. Non-megapixel lenses cannot fully display the true resolution of a megapixel sensor.
C-CS Adapter Ring: for cameras that have a CS Mount, a C Mount lens can be used but only with an adapter that fits between the lens and camera. Please ask for details.
 If at any time you require additional assistance or would like additional product information, please feel free to contact us Monday
- Friday: 7am - 5 pm Pacific Standard Time.
Security Systems Direct
Downey, CA 90240
Tel: 562.923.2323 Fax: 866.733.9890
Email: info@SecuritySystemsDirect.biz
Click Here to Email Us
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Security Camera Lenses, Megapixel, HDCCTV, High Definition Security Camera Lenses
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