Method for acquiring an image of at least one celestial body, comprising the following steps: - using a device comprising a hollow body into which light rays coming from at least one celestial body under observation enter during use, said celestial body under observation being chosen from among at least a first celestial body of a first nature and a second celestial body of a second nature, the nature of the first celestial body being different from the nature of the second celestial body , - arranging an optical system having an optical axis in the hollow body , which optical system is configured such that the light rays form an image of the celestial body under observation in an image focus located in a focal plane , - arranging a matrix of optical sensors in the image focus in order to acquire the image of the celestial body under observation, which matrix has a plurality n of unitary pixels P 1 , characterized in that it also comprises the following steps: - defining a first configuration of optical sensors of the matrix so as to acquire the image of the first celestial body of a first nature, said first configuration having the plurality n of unitary pixels P 1 , n being a natural integer, - defining at least one second configuration of optical sensors of the matrix so as to acquire the image of the second celestial body of a second nature, said second configuration having a plurality m 2 of macro-pixels P 2 formed by groups of unitary pixels P 1 , m 2 being a natural integer, - selecting one of the configurations of optical sensors to acquire the image of the celestial body formed in the image focus , the configuration of optical sensors being selected on the basis of the nature of the celestial body under observation, either the abovementioned first celestial body of a first nature or the abovementioned second celestial body of a second nature. - using a device comprising a hollow body into which light rays coming from at least one celestial body under observation enter during use, said celestial body under observation being chosen from among at least a first celestial body of a first nature and a second celestial body of a second nature, the nature of the first celestial body being different from the nature of the second celestial body , - arranging an optical system having an optical axis in the hollow body , which optical system is configured such that the light rays form an image of the celestial body under observation in an image focus located in a focal plane , - arranging a matrix of optical sensors in the image focus in order to acquire the image of the celestial body under observation, which matrix has a plurality n of unitary pixels P 1 , - defining a first configuration of optical sensors of the matrix so as to acquire the image of the first celestial body of a first nature, said first configuration having the plurality n of unitary pixels P 1 , n being a natural integer, - defining at least one second configuration of optical sensors of the matrix so as to acquire the image of the second celestial body of a second nature, said second configuration having a plurality m 2 of macro-pixels P 2 formed by groups of unitary pixels P 1 , m 2 being a natural integer, - selecting one of the configurations of optical sensors to acquire the image of the celestial body formed in the image focus , the configuration of optical sensors being selected on the basis of the nature of the celestial body under observation, either the abovementioned first celestial body of a first nature or the abovementioned second celestial body of a second nature. <EOS>