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A finder optical system for observing an object therethrough, includes a variable-power objective optical system, an eyepiece optical system for guiding light from the object via the objective optical system to an observer, and an adjustor for changing the optical characteristics of an image of the

A finder optical system for observing an object therethrough, includes a variable-power objective optical system, an eyepiece optical system for guiding light from the object via the objective optical system to an observer, and an adjustor for changing the optical characteristics of an image of the object observed by the observer through the eyepiece optical system based on information about the temperature of the finder optical system, the distance from the finder optical system to the object, and the zoom position of the objective optical system.

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A finder optical system for observing an object therethrough, includes a variable-power objective optical system, an eyepiece optical system for guiding light from the object via the objective optical system to an observer, and an adjustor for changing the optical characteristics of an image of the

A finder optical system for observing an object therethrough, includes a variable-power objective optical system, an eyepiece optical system for guiding light from the object via the objective optical system to an observer, and an adjustor for changing the optical characteristics of an image of the object observed by the observer through the eyepiece optical system based on information about the temperature of the finder optical system, the distance from the finder optical system to the object, and the zoom position of the objective optical system. that a photographic print of a predetermined size is to be produced from a predetermined central fragment of each of the picture frames, a plurality of data recording zones, each being arranged between one of the picture frames and a first edge of the photo filmstrip, the print format data being recorded in each of the data recording zones, said print format data comprising a code consisting of three dots optically prerecorded on each of the data recording zones; reading out said data from said photo filmstrip after said photo filmstrip is developed; and printing an image of said central fragment of each of the picture frames onto photographic paper by enlarging at a specific print magnification that is determined based on the size of said central fragment relative to said predetermined print size; the printing step being performed by a device constructed so that if zero to two dots are detected from one of said data recording zones, a photographic print of an aspect ratio selected from among a plurality of aspect ratios based on the number of dots is produced from a corresponding said picture frame, instead of enlarging a central fragment of the picture frame. 9. A method as recited in claim 8, wherein said specific print magnification is 2-times to 3-times as large as a standard print magnification that is used for producing a photographic print in said predetermined size from a print area that is approximately equal to said exposure area. 10. A method as recited in claim 8, wherein said method uses a digital printer that processes image data obtained by scanning each picture frame, to make printing on the basis of said processed image data.