Exclude Category from some pages

Hi, for a Project i need to exclude some categories from some pages.

First i used this Code in the Theme functions.php:

// remove from home page
function exclude_category($query) {
if ( $query->is_home ) {
$query->set('cat', '-26');
}
return $query;
}
add_filter('pre_get_posts', 'exclude_category');
// remove from home page

This exclude the cat from all Pages. But it works.
Then i try this:

// remove from home page
function exclude_category($query) {
if ( $query->is_page( array( 5, 83 ) ) ) {
$query->set('cat', '-26');
}
return $query;
}
add_filter('pre_get_posts', 'exclude_category');
// remove from home page

but this dont works. Any idea why?

Thx for help