请问这个句子中,that引导的句子做什么成分?补充说明?是一个什么从句呢?magazine photographers,in particular,consider themselvesfortunate to the extent that they can minimize its presence in their photographs.

请问这个句子中,that引导的句子做什么成分?
补充说明?是一个什么从句呢?
magazine photographers,in particular,consider themselves
fortunate to the extent that they can minimize its presence in their photographs.