Yeah, still trying to figure it out. But it messes a little bit with my brain because the little glass window beneath the sports finder turns the damn world upside down...
But does zone focusing work on a Rolleiflex? And are the results ok?
In most cases, covering news shots would be at infinity, but as I recall, once you have your distance figured out zone focus works pretty well. Many news photographers in the 40s and 50s used 4X5 Speed Graphic and other press cameras without the rangefinder as they got really good at judging distance. In WWII most of the U.S Army's Speeds did not have rangefinders. I only shot a Rolliflex once or twice, don't recall how the sports finder works. With Yashica 124 and D, the front panel of the viewing hoods folds down and clicks in the down position, the back panel has a viewing slot the back window and the from window creates the spots finder. Viewing done at eye level, but no paralex correction, need to give the shot some room for imperfect viewing.
Here is a link the the yashica 124 manual, shows how the sports finder works.