Somewhat unsuccessful large Alien stealth flying saucer (with defensive Earthling cranes)
They became invisible only when I cancelled my own light field.
Pretty feeble technology for any serious invasion, and which permits one to suppose there is still hope for Earth.
I got this picture of them with, indeed, my best lens: the 18-270.

I can only conclude that they saw you and were trying to make a dash to hide behind the building?
Both the *istDS and the K5 are incurably addicted to old glass
My page on Photocrowd - link

johnriley
21 yearsPentax User Team
Tyldesley, Manchester
Best regards, John