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A computer having a main casing, a first bracket mounted on the main casing and accommodating a first peripheral device, and a second bracket removably combined to the first bracket and accommodating a second peripheral device. With this configuration, the computer has a computer casing which is com

A computer having a main casing, a first bracket mounted on the main casing and accommodating a first peripheral device, and a second bracket removably combined to the first bracket and accommodating a second peripheral device. With this configuration, the computer has a computer casing which is compact without blocking hardware components with respect to each other.

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A computer having a main casing, a first bracket mounted on the main casing and accommodating a first peripheral device, and a second bracket removably combined to the first bracket and accommodating a second peripheral device. With this configuration, the computer has a computer casing which is com

A computer having a main casing, a first bracket mounted on the main casing and accommodating a first peripheral device, and a second bracket removably combined to the first bracket and accommodating a second peripheral device. With this configuration, the computer has a computer casing which is compact without blocking hardware components with respect to each other. a wide-angle position to a telephoto position by moving the lens units toward the object side so as to widen an airspace between said first lens unit and said second lens unit and narrow an airspace between said second lens unit and said third lens unit, wherein said second lens unit comprises a bi-concave lens element disposed on the most object side and at least two positive lens elements, and said second lens unit comprises two lens components or three lens components in all the second lens unit, and wherein said zoom optical system satisfies the following conditions: 0.5T/fTG3/fW|Wrepresents a focal length of the zoom optical system at the wide-angle position, a reference symbol fTrepresents a focal length of the zoom optical system at the telephoto position, a reference symbol LTrepresents a distance as measured from a most object side surface to an image surface on an optical axis at the telephoto position, and a reference symbol fG3represents a focal length of the third lens unit. 4. A zoom optical system according to any one of claims 1-3, s