1. A camera comprising: a line-of-sight detecting device for detecting a line of sight of an observer; photometric means for detecting luminances of a plurality of subareas into which a luminance detection area is partitioned; selecting means for selecting a specific subarea from the plurality of subareas on the basis of information regarding the line of sight detected by said light-of-sight detecting device; first generating means for generating first luminance data regarding the specific subarea selected by said selecting means; second generating means for generating second luminance data regarding a group of subareas composed of a plurality of subareas excluding the specific subarea; weighting means for weighting the first luminance data and the second luminance data and for producing a corresponding output; and correcting means for correcting the output of said weighting means on the basis of a difference between the first luminance data and the second luminance data.