What Is A Varifocal Security Camera?
One of the best values in security cameras are those equipped with a varifocal lens. These lenses come for a variety of camera styles with
the two most popular choices being very-focal lenses on dome cameras and
box cameras.
Varifocal Lenses Are Great For Businesses That Plan to Expand
These lenses are perfect in many situations. The first situation is a
business that plans to expand to a new location someday. When a camera
is equipped with a varifocal lens, then the business owner can easily
move the camera to a new location. Adjusting the camera at the new
location can easily be accomplished just by adjusting the focal length
of the lens.
Varifocal Lenses Are Great For Homeowners On The Move
Many homeowners enjoy this benefit as the camera equipped with a
varifocal lens can easily be packed up and moved to a new location. The
homeowner may choose to move the camera when they move to a larger
property or a smaller property and the lens can easily be adjusted to
the new location.
Varifocal Lenses Provide Flexibility
The varifocal lens also makes a great choice for business owners and
homeowners who may not be exactly sure what size of lens they need. With
fixed distance lenses, the business owner or homeowner must guess at
what length of lens that they need. If they guess wrong, then the whole
unit must be returned if allowed or sold as a second hand camera costing
both time and frustration.
Change Location Of Recording Without Anyone Knowing
These lenses are also super at changing what the camera is recording
without having to change the camera position. Without moving the camera,
it is possible to record many different situations. This is
particularly useful in a commercial setting when you may want to watch
one situation one day and another situation the next. The lens will also
allow you to change the angle at which you see a situation.
Many people are familiar with the zoom feature of a digital camera
and the varifocal lens on a security system works very similar to the
lens on that camera. Just like having more zoom ability on a digital
camera, the wider the range of objects this camera can be focused on,
usually by turning a knob on the outside of the camera’s housing.
Dome Varifocal Security Cameras
Dome security cameras can be equipped with varifocal lenses for both
indoor and outdoor use depending on the housing chosen. The most common
varifocal lens on dome cameras is the 3.6 mm to 8 mm lens. Remember that
the wider the range of numbers the more choices you have when using the
camera. Cameras with a 3.6 mm to 8 mm lens have a maximum angle of
viewing of 79.22 degrees and a minimum angle of viewing of 33.4 degrees.
It is important to look at the distance that you want to install the
dome security camera from where the action will likely occur. The
smaller the millimeter number the closer the camera will need to be to
the action, but the camera will have a wide area where it will record
the action. The larger the millimeters number the smaller the area that
the camera will record the action, but the action can be recorded from
further away.
In order to determine the right focal length consider these facts. If
you are watching a parking lot with a lower millimeter lens setting,
then you will be able to see about six cars parked about 15 feet away.
You will be able to see the make and model of the car, but very little
else. If you use a camera with a higher millimeter lens, you will be
able to see more details, such as car license plates and face details,
but you will be able to see very little space.
Infrared Dome Security Camera with Varifocal Lenses
These cameras can be equipped with different types of operating
systems. For example, many business owners and homeowners choose
infrared security camera with varifocal lenses. These cameras offer the
owner the ability to use the camera when no light is available. These
cameras emit a small LED light that provides enough light for the camera
to operate. It is important to look for a camera with IR power that
matches the focal length, as the lights will only broadcast so far.
Day/Night Dome Security Cameras with Varifocal Lenses
Others choose day/night cameras with varifocal lenses. These cameras
are equipped with special mirrors that collect any available light and
use it to produce the footage. As more light is available, the camera
will take colored pictures, but in low light situations, the pictures
will have a green tint.
Daytime Dome Security Cameras with Varifocal Lenses
These cameras operate with the available light, so if there are no
light these cameras will not operate. They are great in many situations
where light is available all the time. An example would be inside a
retail store where the lights are left on even at night.
Other Considerations When Buying Dome Security Cameras With Varifocal Lenses
Whichever dome security cameras with a varifocal lens
the user chooses to buy, the buyer needs to think about other aspects.
The buyer needs to think about how the footage will be viewed. There are
several viewing options including a dedicated VCR, connecting it to a
computer monitor or watching it on a smart phone. It is also important
to consider who will monitor the footage. Some business owners will
choose to monitor their own, some will assign a staff person to do this
job and others will hire an outside company to do the monitoring.
Resolution on Dome Security Cameras with Varifocal Lenses
The buyer of a security system will want to consider the security
systems resolution. This is measured in either TV lines or in
megapixels. The higher the cameras resolution, the better the details
that can be seen in the footage. The colors will also be truer to real
life. A 1.2MP camera has 3.5 times the resolution of an analog camera in
its largest format. Therefore most users find megapixels cameras the
better buy.
Sensors on Dome Security Cameras with Varifocal Lenses
A very important consideration when buying a dome security camera
with varifocal lens is the size of the sensor. The smaller the sensor,
often called a CCD chip, the narrower the angle of view. Sensors in
these cameras usually come in four different sizes, which are ¼ inch,
1/3 inch, ½ inch and 2/3 inch. If you choose a camera with a ¼ inch
sensor then the maximum angle of the field of view is 57.77 degrees and
the minimum field of view is 22.62 degrees. If you choose the 1/3 inch
sensor, then the maximum angle of the field of view is 79.22 degrees and
the minimum is 33.4 degrees. If you choose the half-inch sensor, then
the maximum angle of the field of view is 95.63 degrees and the minimum
field of view is 43.6 degrees. When you choose the largest sensor, the
largest field of view is 113.22 degrees and the smallest field of view
is 57.62 degrees.
Varifocal Lens Box Camera
Many homeowners and business owners prefer box cameras. These cameras
are great because they deter many criminals because of the mere sight
of the camera. The most common varifocal lens on the box camera is the
3millimeter to 15millimeter. This gives the user a wide range of angles
to choose from when installing the camera inside or outside in
protective housing. Just like with the dome cameras, varifocal lenses on
box cameras smallest settings give the widest field of view with 15
millimeters giving the narrowest point of view.
Varifocal Lens Box Camera Sensors
It is important to consider the sensor when buying a varifocal lens
box camera sensor. Again, like with the dome security camera the user
generally has four choices. It is important to notice that the sensor
controls the distance the camera can be placed from the target.
Varifocal Lens Bullet Camera
Bullet security cameras can also be equipped with varifocal lenses
with the most common being 2.8 to 10mm. These cameras can also be
equipped with the four different size sensors. It is important to
consider the different combinations for this camera.
Costs
Most varifocal lenses cost about 20 to 30 percent more than a fixed
lens camera, but consider the flexibility that is afforded with these
lenses. One can move the camera to accommodate different situations. One
can adjust the length of the lens to get the best picture. Furthermore,
a person can buy cameras with different sensors to further expand their
flexibility. Making sure that you buy the best camera for your money
will assure that you are happy with the choice that you made.
The best process to use when choosing a camera is to choose the
location that you want to put the camera in and then choose the style of
camera that you want to install. Next, consider buying a camera with a
varifocal lens. Then choose the size of sensor that is best for what you
want to accomplish now and in the future. Finally, consider the
resolution you want in the camera.
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