How do I change the amount of items retrieved from a flickr feed?

Does anyone know the parameter to change (decrease) the amount of items retrieved in the flickr feed?

It always returns 20 items b开发者_JAVA百科y default. Example:

http://api.flickr.com/services/feeds/photos_public.gne?format=json

The documentation is rather scarce:

http://www.flickr.com/services/feeds/

Not possible it seems.

There doesn't seem to be a way to control this from the flickr API, however, I did come up with another site which offers RSS of flickr feeds (precisely because the flickr API is limiting)

http://www.degraeve.com/flickr-rss/