Simple problem, let me explain

My website: http://www.kameraobskura.com.

Right now, when you click on one of the thumbnails it then opens up the post, which is the picture and whatever writing I want to have. Currently, when you click the picture at this point, it opens up another attachment id page, which is basically the same type of page. When you click on that picture it opens up a highres. This end point is fine, but I’d like to take out this middle level- the attachment id page, because it is redundant. Any idea how to do this?

Thanks- Ryan