Skip to main content

eps Aur abstract: Pieri

Stellar Photometry With DSLR­: Benchmark of Two Color Correction Techniques Toward Johnson’s VJ and Tycho VT


Roger Pieri

37 C rue Charles Dumont, Dijon, 21000, France

Received April 24, 2012; revised June 18, 2012; accepted August 17 2012


DSLRs are now routinely used for measuring the V magnitude of stars through their G channel output. This requires a transformation to Johnson V, using a correction based on the catalogue (B–V) color indices of the stars. This paper reviews the responses of the involved passbands and proposes an alternate solution using a synthetic filter made by combining the three RGB DSLR channels. The assessment of the two techniques through experimentation being uncertain, we have chosen to use a computer simulation instead. This simulation combines the measured spectral responses of the DSLR channels, the atmospheric reddening, and star spectra from the Pickles library.

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484