Shuttershot slider resolution

Hi everyone!

I’m having small problem with my wordpress theme (shuttershot). My issue is the image resolution of the slider. Unfortunately my monitor resolution is little bit low – 1680 x 1050 and when i’m watching on it everything is OK, But when i saw my blog page at my friends monitor (1920 x 1080) doesn’t look good at all! The images were squeezed.
So my question is how can I fix it to look good enough on every resolution?

10x in advanced!