Ống bơ 1.4D:
http://farm6.staticflickr.com/5493/10892307095_e3116f893a_b.jpg
_DSC6626 by Duong Anh Quan, on Flickr

http://farm8.staticflickr.com/7416/10892336206_e5666bea07_b.jpg
_DSC6628 by...