LOWLIGHT BIF SHOOTER. My 1DM2 + naked 500 f4 IS, supported by a Manfrotto 475B tripod and 3421 gimbal head, stands over the wetlands at sunset.
It had fired its last BIF shot for the day, as light was already too low for BIFs even with high ISOs and an aperture of f/4.

[20D + 18-200 OS, built-in flash at -2/3 FEC, hand held]