Frozen lake

It's spring finally here in Warsaw. So today I upload a photo from winter taken during morning blue hour :)

EXIF data:
Camera: Canon 5D MK II
Lens: Canon 24-105 f/4 L IS USM
Focal length: 24 mm
Aperture: f/8.0
Exposure time: 1/15 s ("middle" exposure)
ISO: 100
Number of exposures: 7
E.V. Step: 1
Flash used: no
Tripod: yes
Filters: no
Software: Magic Lantern 2.3, Photomatix Pro 4.2.6, Lightroom 4.2, Photoshop CS6