Conditional tag to show content in custom rss feed?

Question

The wonderful answer here helped me create a custom RSS feed, and that's one major part done.

I know that there's the is_feed conditional tag to show content only if it's a feed. But is there a conditional tag to show content only in my custom feed? If not, is there any other way to do it? (PS: I want to change the output of Wordpress' built-in gallery in my custom feed.)

Answer 1

Okay, that was quite easy. So, if your custom feed URL (non-pretty) is http://example.com/?feed=wpse63760_custom_feed, then the conditional tag would be used as such:

if ( is_feed( $feeds = 'wpse63760_custom_feed' ) ) {
   // So what's the conditional content?
} else {
   // This is shown everywhere else
}