P-Iris Mega-Pixel Vari-Focal Lens

Press Release
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October 28, 2011

Tamron Co., Ltd. (headquarters: Saitama City; President: Morio Ono) announced the release of a 1/3”-format 2.8-8mm F/1.2 Mega-Pixel Vari-Focal with P-Iris (Models M13VP288IR) that is compatible with 3 Mega-Pixel Day/Night cameras and delivers full high-definition 1080p images over the entire focal length range, both in visible and near infrared light ranges.

Development Concept

As a result of the rising demand for higher image quality in security systems, requirements for higher pixel sensors are increasing. Existing lenses were unable to implement fine automatic iris control to suit various monitoring environments. Therefore bright areas in particular tended to result in an image quality loss due to the diffraction phenomenon caused by small opening aperture. Meanwhile, there is a growing need for mega-pixel cameras to deliver high quality images over the entire angle of view, and with greater depth of field. To overcome these issues, Tamron engineers have developed a P-Iris Vari-Focal Lens equipped with a bipolar drive stepper motor that allows fine iris control to suit any environment.

Main Features:

1. High performance 3 Mega-Pixel Lenses
Through the use of an Aspherical element and a special LD (Low Dispersion) optical glass material in its advanced optical system, the new Vari-Focal Lens realize high optical performance that is a perfect match for 3 Mega-pixel cameras, delivering high image quality equivalent to 1080p full high-definition. At the same time, the lens features fast maximum open aperture of F/1.2 that helps to increase the sensitivity of the camera.

2. Stepper motor design allows the precise control of iris setting
There is often a drastic drop in image quality with ordinary lenses due to diffraction phenomenon caused by small opening apertures. Normally, a galvanometer is used to control the iris of the lens but precise adjustments of the aperture to a desired position was not possible. By using a stepper motor to control the iris, this lens is capable of adjusting the aperture at a position that does not cause diffraction, enabling an appropriate level of exposure by utilizing the camera shutter speed. The result is that high quality, high contrast images can be recorded, even in bright outdoor areas. This fine tuning control will allow the user to acquire the best image quality delivering good depth of field at most installations.

3. Mega-Pixel resolution even in “Night Mode”
Tamron's 3 Mega-Pixel Lens delivers superb clear images from “Day Mode” to “Night Mode”. 3 Mega-Pixel resolution is achieved in both modes.

4. 100 degree horizontal angle, Super-Wide-Angle lens
The wide horizontal angle of view-100.1 degrees-makes it possible to cover the entire room when positioning the camera in a corner. Supported by 3 Mega-Pixel resolutions, this image can be cropped and still show a clear image to see what is happening in the room.

5. Clear images without color smear by minimizing chromatic aberration
The Mega-Pixel IR Corrected lens uses an optical design pursuing minimization of chromatic aberration to the maximum extent in order to realize clear images without color smear. In addition, by employing advanced countermeasures against light reflection on the lens surface including multi-layer coatings, Tamron engineers have successfully minimized the light reflection, realizing clear images without ghosting and flare.

6. Highly accurate mechanical construction
In designing the Mega-Pixel IR Corrected lens, Tamron enhanced the precision of each part and component, and shifted to mass-production by using advanced manufacturing technologies. Before going into mass-production, all structural causes that are likely to lead to image degradation, including image displacement and one-sided blur, were eliminated.

7. Compact design
The Mega-Pixel IR Corrected Lens realizes virtually the same compactness as the conventional models (M13VM308/M13VG308 3.0-8mm F/1.0 lenses).

8. Designed to match any camera
The amount of protrusion of the rear element from the lens mount is reduced in order to prevent interference with components within the camera. As a result, the lenses can be mounted on almost all camera models.

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