Sharing a shot of the moon using the 400 f/5.6 with a 2x and 1.5x (yes, 1.5x Kenko) TC attached. I've never been able to capture this amount of detail with the bare 400 f/5.6; I guess the magnification by the TCs is enough to cancel out the loss of IQ.
Thanks for looking.
Moon observed from Quezon City, Philippines
16 June 2011 23:00:11 GMT+0800
40D, 400/5.6 + 2x + 1.5x, 1200mm, ISO 100, f/17, 1/30 sec, manual exposure, manual focus via live view, tripod/gimbal, cable release, MLU