Specifications: 

• Focal: 25mm
• F: 1.6
• Mount: CS
• Sensor Size: 1/3"
• FOV: 19.3° 
• M.O.D.: 0.3m/11.8in
• Size: 30 x 24mm/1.18 x 0.94in

Features:

• The fixed iris lens is particularly of benefit in cameras
• This fixed iris lens is being designed for 1/3 inch camera and mount is CS type
• It is a professional lens of expert level
• This camera lens provides ultra clear vision for your camera

Details:

• This fixed iris lens is being designed for 1/3 inch camera and mount is CS type

• This cctv camera lens provides ultra clear vision for your camera

• The security camera lens is easy to install, provides lots of convenience to you

• Made of high quality material, the fixed iris lens is durable and reliable for long time use

Size in Detail:

Different Camera Lenses:

• Fixed Focal Length Lenses - Choose a fixed focal length lens for optimum clarity, sharpness and overall image quality. Fixed focal length lenses offer one angle of view, and do not zoom. Because there is less glass and internal lens elements involved, these lenses provide exceptional quality. Manual film-based SLR cameras are often sold with a fixed 50mm lens
• Zoom Lenses - Considered an all-in-one type of lens, zoom lenses offer the photographer a variety of focal lengths. From wide to telephoto, these lenses are meant to cover a range of angles, while sacrificing a small amount of optical quality because light has to travel through so many layers of glass in a longer barrel
• Wide-Angle Lenses - Photographing wide scenes in small places is easy with a wide-angle lens. These lenses usually range in focal length from 24 mm to 35 mm, and are available as a fixed focal-length lens or a zoom lens. Capturing a wide crowd shot from a podium, or a large sports team photo without standing on the other side of the field is simple with a wide-angle lens
• Telephoto Lenses - Bringing the scene up closer is what telephoto lenses are designed to do. These lenses reach out into the scene and optically make the subject matter appear closer. Think about a recent newspaper sports section or magazine where you only see one or two athletes engaged in an event. The photographer obviously wasn't standing on the football field in front of the play or rubbing elbows with the basketball player. A telephoto lens, such as 200 mm, was used to reach deep into the action. These lenses are also available as a fixed focal length, or a zoom. A common telephoto zooms is 70 to 200 mm
• Mid-range Lenses - Between wide angle and telephoto lenses are the mid-range, or portrait, lenses. Fixed focal-length mid-range lenses include an 85 mm lens, or a 105 mm lens. Common zoom lenses that offer mid-range coverage are 35 to 105 mm or 28 to 135 mm lenses. These lenses capture all the day-to-day activities well. Family and friends doing activities in close proximity to the photographer, pictures of still life and photos around the house are easy to capture with a mid-range lens

What Is the Iris on a Camera Lens?

Fixed-Aperture Lenses:

• Some cameras, usually point and shoot, according to the website photxels.com, have a fixed-aperture lens. This means the iris of the lens is not adjustable but rather fixed in size. The camera adjusts in other ways--like shutter speed or light sensitivity of the sensor-- for changing light conditions.

Adjustable Aperture:

• The mechanical iris is made up of a number of leaves or pieces that are moved to decrease or increase the size of the opening or the aperture of the lens. The larger the aperture or opening, the smaller the f-stop number used to describe it. An f-stop of 2.8, for example, would have a larger opening in the iris than an f-stop of 5.6.

Lens Sweet Spot:

• Most lenses have an aperture where the focus and picture quality is optimal. This is often found by trial and error by the photographer, although the website commonsensephotography.com says the sweet spot is often close to f-stop 8 on many lenses.

Automatic Iris Control:

• Auto-iris cameras continually adjust the aperture of the lens adjusting to changing light conditions automatically. This is more common in video and security cameras than it is in still cameras. The auto-iris feature will make the transitions required during the changing light of a day in a security camera setting, allowing the officer to have an acceptable view of the scene throughout the day.

Fast Lenses:

• Lenses where the iris opens to a large aperture are said to be fast because they allow more light through the lens and can utilize faster shutter speeds. Fast lenses are often associated with indoor, portrait and sports photography. An iris openings of f-stop 2.4 is considered fast when associated with most modern digital cameras while an f-stop of 1.4 was considered fast for 35 millimeter film cameras.

Package Included:

• 1 x Lens