app/views/media_entries/previews/_image.html.haml
.ui-has-magnifier
%a{:href => image_media_resource_path(@media_entry, :size => :maximum), :target => "_blank"}
= image_tag image_media_resource_path(@media_entry, :size => :large), :class => "ui-media-overview-preview-item"
%a#ui-image-zoom.ui-magnifier{:href => image_media_resource_path(@media_entry, :size => :maximum), :target => "_blank"}
.icon-magnifier.bright