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Glossary "O"

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The second of two figures quoted on a pair of binoculars that indicates the diameter of the lens furthest away from your eye when you're looking through them. It's quoted in millimeters and the first figure is the magnification. A 10x50 pair, for example, has 10x magnification with a 50mm objective lens.
The name given to the printing method used by companies that produce high volumes of magazines, catalogues and newspaper. Each of the cyan, yellow, magenta and black inks are applied to the paper individually. Ink is first applied to a printing plate cylinder which is then transferred to a cylinder covered with rubber and finally to the paper. Ink will only hold on areas that have a percentage of that colour in the final image.
A lightbox that has a mirror and lens projection system built in so that the user can present data to groups using acetate sheets printed with data.
A basic point & shoot camera that has a film sealed inside. The whole thing is handed over to the processing lab when the film is exposed. Camera parts are collected and recycled. Originally called disposable, but to avoid angry environmentalists the name was quickly change to single-use.
A fresh solution that you can't replenish or reuse.
The density of a material such as a film or filter. In digital terms, opacity can be adjusted to make it look less prominent or allow a lower layer to show through.
Where the shutter is held open and the flash is fired manually. This allows you to fire a smaller powered flash several times to ensure either a large area is covered or a single area receives enough exposure a technique known as painting with light.
Many scanners and some digital cameras have two resolution figures quoted in their spec sheets - optical and interpolated. Optical is the figure you should trust as it's a true pixel capture, unlike interpolated that uses the optical figures to calculate and add new pixels to increase resolution.
The small window in the camera that you look through when taking a picture.
A lens that can be adjusted from one focal length to another. Wide zooms cover a range of wide-angle focal lengths while tele zooms cover telephoto ranges and superzooms go from wide angle to a long telephoto.
Where the data of a digital image is changed or optimised without removing pixels. This is necessary when using pictures on the Web that need to be as small as possible. Some programs have an auto optimising feature that will convert the picture to a JPEG and include the necessary colour palette to ensure the picture looks as good as it did before optimisation.
Short for Orthochromatic – a high contrast film that's sensitive to all colour other than red and deep orange. As a result these can be handled under red safelight conditions and are designed primarily for reproducing halftone images or artistic black and white shots that have few mid tones.
A meter reading taken from the image that appears on the film surface during exposure. Its main use is for through-the-lens flash exposure readings.
Name used to describe a print or transparency that's produced from a digital image.