I shoot alone usually when testing ideas, working FIFO I can be out late on weird nights so I rarely ever come across anyone. I find when I'm on my own I rush less and think more about the technique I'm trying to learn.
Having mates there is always better though, cuts down on setup times and positioning car and also adds variety of subject matter etc. Hence why I'm always offering to shoot P-WRX member's cars as further practise
