Abstract
In this study, we formulated the brightness relation of two digital photos captured by a single digital camera and verified it experimentally. The experimental results suggested that the used zoom lens has an intrinsic error, thereby making accurate photometry difficult. However, by dividing the brightness by the intrinsic error of the zoom lens, performing accurate photometry is possible. The photometry results with the single camera suggested that the brightness relation derived, and the magnitude system in astronomical photometry are applicable to widespread general photometry.
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