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Instructions for Mounting a Sturdy Bracket:
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Two main purposes:
The first purpose is actually to keep the flash in a vertical alignment with the lens, whether the camera is in a landscape (horizontal) position or a portrait (camera turned sideways) position. By keeping the flash centered and vertical over the lens, it throws the shadows from the flash behind the person and lower down where the can't be seen as easily. Also, a high flash position is more likely to be pleasing lighting, than flash closer to the lens. One of the marks of an amateur is the annoying side-shadow, which is why pros will use a bracket and keep the flash centered high over the lens.
The other purpose is ostensibly to prevent red eye, although a hotshoe flash is usually far enough away from the lens to prevent red eye in a typical room just from being in the hotshoe. A flash in a bracket also moves it a little further away from the lens and helps to prevent red-eye at longer distances, which you might see in a church for example (i.e. larger than a typical room, where the photographer is further back).
A security camera can come in many different styles including dome, bullet, infrared and c-mount. The security camera that will work best for your application will depend on several factors such as whether you will use the security cameras inside or out, during the day, nighttime, or both.
Bullet style security cameras are the most popular. They can be used inside or out. These security cameras come in black and white or color and come with all of the required mounting hardware. The security cameras casings are weather resistant and don't require added external protection. Most security cameras have a fixed 4mm lens that allows you to see facial features out to about 35 feet and provides a 70 degree angle of view. This is the widest angle you can have without distorting the picture. Resolution levels for black and white security cameras are about 400 lines, any higher and the benefits are minimal. For color cameras, the higher the resolution the better.
Infrared security cameras are also very popular as they allow an image to be seen in little or no lighting conditions. Most infrared security cameras are bullet style and can be used inside or out. The cameras have infrared lighting installed around the outer edge of the lens which allows the security camera to see in no light for up to 25 feet - even further with a little bit of light (like street lighting or an outside light).
A relatively new type of security camera to the market is the day / night security camera. These types of security cameras have an extra sensitive imaging chip which allows it to capture a good picture in low light situations without using infrared led's. This is especially handy in outdoor applications because infrared security cameras do not do well in outdoor housings. Unless the infrared security camera is installed flush up to the glass of the housing, the infrared lights can reflect off of the glass of the housing which degrades the image.
The advantage to c-mount security cameras is that the lens can be changed. You'll want a special camera lens if you need to see further than 35 ft. The color c-mount security camera allows you to change lenses on the camera giving you the ability to zoom into a particular area. Varifocal camera lenses allow you to adjust the focus from 5 to 50 mm. These lenses can be used inside only unless you put it in special housing for outdoor use.
Dome security cameras basically provide a different look. Also, if you have any concerns about tampering, check out our Infrared Armor Dome Security Camera. It will withstand a 10 lb sledgehammer blow and can be used inside or out, daytime or nighttime.
You can choose one according to your own situation. Hope my answer helps.
An automatic iris lens is a lens with a motorized iris that automatically adjusts to only allow a specific amount of light to reach the image sensor. When there is too much light, the iris will close to reduce the amount of light let in. Auto iris lenses are primarily used in applications where light levels vary and it would be impracticable to manually adjust the lens. Automatic iris lenses are generally more efficient than the electronic shutter since they actually control the amount of light reaching the sensor as opposed to simply adjusting the shutter speed.
