I have now found John HOOD'S 1st marriage and that was also in Adelaide, to Mary Martha HUBBE in 1871. They had 4 children, and their names match with what was written in the website entry sent by Jorose i.e. Samuel, William, John & Thomas.
All the dots are connecting well - thankyou Jorose.
Mary Martha died 1881 and he married Ruth DOLLMAN in 1882. So now I am positive we are chasing the correct John HOOD, Photographer/Artist, supposedly born Reading Berkshire 1839. There seems to be some discrepancy with his age as on his lst marriage it makes him b.c1841 and 2nd marriage, b.c.1842.
I've veered off the Dollman track a bit but this has been an interesting find - anything else is a bonus, thanks, Sashar