Tumblr multiple authors?

I already have a tumblr blog where I am the sole author of it. However, I went to create a new one under the same email, a photography one, and the only way that I can seem to be able to do it is if I create a blog that has the capability to have multiple authors. But I don't want that. I want to create one where I am the sole author, just like the previous one I have. Any suggestions?