Each extension tested has bugs, deficiencies, excessive complexity, or lack of really frontend edition.
And finally Lantern Fish does exactly what I want without the slightest problem!
This extension combines the improvements of joomla 2.5 and 3.X with simplicity of Joomfish.
Congratulations to the developers!
In addition the service is excellent, I had a little problem with creating thumbnails and very quickly gave me a solution.
For future versions would be nice to choose between different types of popup, for example sexylightbox.