The rising of Sirius – A man cools down his dog at the beach of Cascais. Captured with Rolleiflex (T) /Rollei Werke/ – on a Kodak Ektar 100 / scanned with a Canoscan 9000 F Mark II. (The dog days or dog days of summer are the hot, sultry days of summer. They were historically the period following the heliacal rising of the star system Sirius)
Indeed. You might try swapping the elements of a Rolleinar. Hardly can tell the difference. So if you do not know which element goes onto the taking or finding lens, should not worry, your photo taken will be nearly just as good as it would be in the proper order.