Other Masonry aspect ratio

Hello,

How I can have other Masonry tile options than (1×1, 2×2, 2×1, 2×2)?
At the end I want to have one row on my portfolio page. The images should have full width but should be only 200px in height. As it is now, it’s always 550px.

I can achieve the one row effect by setting the Masonry size to 2×1 – but how do i change the height?

Regards

Chris