Blue Sky from Caretta Shiodome

Canon EOS 60D, Tamron 18-270mm F/3.5-6.3 Di II VC PZD, Kenko Pro1D WIDEBAND C-PL(W) (18mm, f/8, 1/250 sec, ISO-100)

I did know that taking photos from skyscrappers is difficult at night, but didn't know that it IS difficult even in the daytime. The window glass reflects light from the background and makes it quite hard to capture the sky alone. Hmm... this photo seems to be the best shot today, but there remains a lot to be better.