A negative refers to an image that has its brightness values reversed. Therefore in a negative, the light sections show as dark and the dark portions show as light. The intermediate tones are also shown in reverse. A negative also refers to an exposed and developed film that is used for making positive prints of the image.
Opaque
An opaque material or object doesn't transmit light.
Optical Zoom
This means a true zoom effect. A two times optical zoom means the lens can actually zoom in on the image two times. It is different to a digital camera's digital zoom as the digital zoom will lose resolution and an optical zoom will retain the resolution.
Over Expose
If your photo is over exposed it means the camera has let in more light than needed. Too much light will result in a loss of resolution, graininess and less detail in the highlight portions of the image. An over exposed negative will be very dense and will give you light prints.
Parallax
This refers to the difference between what you see through the viewfinder and what the camera actually records on film. Parallax happens when the viewfinder is separate from the camera lens.
Perforations
Perforations are small holes that are punched into the edges of 35 mm film. They are punched with regular spacing so they can line up with sprockets that are in the camera's film take-up mechanism. When the perforations catch the sprockets the film can be forwarded and rewound.
Pixel
A pixel is the smallest single picture element from which images are constructed. A picture that has more pixels in it means it will have a better resolution.
