Iris in/iris out
A system between the elements of the lens, consisting of individual leaves, which allows a certain amount of light to pass through the lens by opening and closing circularly in other words an old technique of punctuation that utilises a diaphragm in front of the lens, which is opened (iris in) or closed (iris out) to begin or end a scene.
If the iris creates a wider opening, more light can pass through; A smaller opening lets in less light. Light from the iris hits the image sensor, and this light is recorded as electrical impulses that create the video.
Functioning of the Camera Iris
Iris works by limiting the amount of light hitting the image sensor. Your video can be bathed in too much light and too little light can make everything dark, so it's important to have an iris that specifically fits your camera's location. The four kinds of camera lore each work a little differently; so you can choose the best one for you.
Fixed Iris
On a fixed iris the aperture that lets light into the camera cannot be adjusted. This type of iris is ideal for closed recording where light levels are consistent while the camera is recording; For example, an office or school with many large overhead lights.
Manual Iris
With a manual iris you can adjust the aperture to let in more or less light by physically adjusting the iris – this is usually done during setup when you have easy access to the camera. can be difficult if installed in a hard-to-reach place.
Auto Iris
Auto irises are motorized and allow them to automatically adjust iris aperture according to the changing light throughout the day. There are two types of auto generation: DC-irises (motor control is inside the camera) and video irises (control is located in the lens itself) Auto iris is more advanced than fixed or manual iris.
Auto-iris cameras are more expensive, as they use technology, but are more suitable for recording outdoors where the changes between sunlight and night can be adjusted automatically.
For more information about types of camera shots check out our article;