I've migrated my old gallery2 installation to zenphoto and I'm very happy about it.
But now I want to redirect my RSS feeds and that does not work, htaccess seems like a mystery. Can anyone explain me how to rewrite

main.php to /
and main.php?g2_view=rss.Render&g2_name=feed to /rss.php

These things are so strange, my regular expressions don't seem to work??

Got it! Adding this to .htaccess did the job:

RewriteCond %{QUERY_STRING} g2.*rss
RewriteRule ^main.php$ /rss.php [R,L]
RewriteRule ^main.php$ / [R,L]