The link below to the pdf file is a short document describing how to G2V calibrate your CCD camera filters. G2V is the
spectral class of specific stars. Our sun is a G2V spectral class stars. Within the article is a link to a page of G2V stars.

G2V Star Calibration

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For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, Romans 1:16 NASU