Mobile responsiveness

Hello!

I’m using Easy Fullscreen Slider as the photo carousel on the home page of my blog. On mobile screens, the image is scaled to fit the entire screen – which is wonderful, however, it also distorts the proportions of the photographs. Is there any way of making the mobile screens only show a part of the photograph (I mean cut out the central part of it rather than rescale the whole image – or scale just the height, but not width)? This is my page again: flyingsamovar.com. Any help greatly appreciated!

Thanks a lot!