We evaluated new colour-transformations for the Sloan photometry by 224 standards and used them to revise both the equations for photometric parallax estimation and metallicity calibration cited by Karaali et al .
( 2003 ) .
This process improves the metallicity and absolute magnitude estimations by [ Fe / H ] \leq 0.3 dex and M ^ { H } _ { g ^ { { } ^ { \prime } } } \geq 0.1 mag respectively .
There is a high correlation for metallicities and absolute magnitudes derived for two systems , UBV and Sloan , by means of the revised calibrations .