Iris
Posterior to Iris
Iris
The 3 major parts of the eye are the Iris, the Lens, and the Retina. The iris regulates the amount of light let into the eye. The lens focuses the incoming light onto the retina. The retina at the back of the eye senses the presence, intensity, and frequencies (colors) of the light, and sends those senses via two optical nerves to the lower rear of the brain for interpretation.
In a camera the following parts could be considered equivalent to the parts of a human eye:Optical diaphragm = IrisAperture in optical diaphragm = PupilOuter lens element / lens glass = CorneaInner lens element = Eye lensCCD Sensor (in a digital camera) = RetinaThis is a huge simplification of a very complex topic. Please see the related links for more information.
The iris acts like the aperture of a camera lens.
Iris
The iris surrounds the lens.
Posterior to Iris
If you have an AF, or auto-focus lens (like the kit 18-55mm lens) you can focus your lens prior to filming, but cannot auto-focus while filming. To manually focus, switch the switch on the side of your lens to 'M' for manual. To focus, turn the outer focus ring on the lens until your subject matter is clear.
the iris and the lens focus the image to fall on the RETINA.
a lens that caves in like this )( as opposed to convex which puffs out like this (). a concave lens. it is used to bend and focus light
A clear thing behind the Iris but befor the Retina
Iris
Anterior
The laser lens is a piece of glass above the laser to help it focus on the media (CD/DVD), just like the lens in a pair of glasses help our eyes focus on whatever we are looking at.
The colored part of the eye is the Iris.