Hi Laura and welcome to the forum:
By 'mirror camera screen' do you mean repeat what it displays on another device? If so what device do you have in mind - monitor or TV screen, for example?
cheers, TREVOR
The mark of good photographer is not what they hold in their hand, it's what they hold in their head;
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
