Good flash used on the 600D with EF-S 60 macro, but effective in Manual mode (100th diaph to 22, to get a satisfactory depth of field), other methods, photograph the trend "overexposed." Overall satisfied, in view of the price. Tip: To prevent the round on shiny surfaces, stick the black tape 20mm wide, up and down. This allows you to illuminate the subject from top to bottom or from right to left.