With the Standard zenphoto you have the possibility to click on the main page top rated Images. This is no Album. It is a Kind of collection and you have to click every single Picture. There is no possibility for a slideshow of the top rated Images. Is there a possibility to collect all top rated Images in 1 Album and make a slide Show out of it? Thanks in advance.

[b] I edited my answer a bit as it was written too quickly written and even wrong in parts… Sorry about that. It is of course easier.[/b]

In short: You would have to create a dynamic album with all of your images. http://www.zenphoto.org/news/how-to-use-the-dynamic-albums-feature

Then you can set the image sorting on the album edit page to "custom" and enter the "rating" field there. (You can also set the sorting via to the "rating" database field/column via the object model mentioned below)

To get a slideshow you would have to create an album object of that album using the object model:
http://www.zenphoto.org/news/zenphotos-object-model-framework

Then you can pass the album object to the printSlidesShow() function of one of the two slideshow plugins. That you could add on your theme where you wish the slideshow to appear.

[i]With the Standard zenphoto you have the possibility to click on the main page top rated Images. [/i]
Btw, what the "standard" is depends really on the theme being used. None of the included official themes actually prints the top rated items. So I am assuming you use another theme.