Custom field only on custom post type?

Sure, just check the post type of the post you’re on.

global $post; // make sure $post is available
if( get_post_type( $post ) == 'your_custom_post_type's_name' ) {
    add_meta_box( ... );
}

UPDATE: I think the $post variable might not have been getting passed to get_post_type.

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