Varifocal Lens

When you have finally begun to select your camera, to achieve your well thought out Home Security project, you should be aware that, besides other elements equally important objective plays a role in the performance the camera.

It is the objective that determines the amount of light entering the camera. Besides the quality of materials and manufacturing, usually reflected in the price, some of the characteristics of the lens have much bearing on the displayed image.

Even if you do not want to become an expert in lenses, there are some concepts you must understand before you buy your camera.

The subjects are well known in the field of photography, so that the principles should not be totally unknown to anyone who has a certain practice of family picture taking even a very basic level.

In most cameras, the lenses are interchangeable. Therefore, you must decide if the image visible on the screen is satisfactory for your application, referring to the depth of field, angle of view and amount of detail you want to make a distinction.

If you are not satisfied with the performance of the standard lens supplied, you should ask to see how a different perspective would enhance the images you want to watch.

Normally, one should choose the best overall image of the object. Note that by changing one of the characteristics (ie aperture) one modifies other related properties (ie the depth of field).

The overall result is a matter of compromise whereby, by sacrificing a bit of a feature we gain a better response to another person.

Fixed focal length is a common selection: although limiting somewhat the dimension of space where all objects result clearly perceived (depth of field), it simplifies the mechanical construction and reduces the price.

You may be familiar with autofocus feature found in modern digital cameras. There is no comparable capacity in cameras because they have to work without supervision. An objective whose focal length can be manually adjusted is called a variable focus lens, but should not normally be considered for surveillance purposes.

Just too sophisticated for the application would be a motorized zoom, capable of being operated remotely to select the preferred level of detail between wide angle and telephoto.

fixed iris or Aperture is another feature to consider simplifying the construction and operation, but with some compromise on the quality of the image. It would probably be easier to provide adequate lighting to go more complex optical.

In conclusion, despite the Nice and expensive alternatives are available for a home monitoring system simple, it would be desirable to select one of the most simple lenses, provided that the image quality is sufficient to achieve the goal.