Rollei Rolleiflex model TLRs have an additional feature for the "sports finder" that allows precise focusing.
A big rectangular frame made of massive wire combined with targeting aid is called sports finder - as following fast action is comparatively easy with this type of finder, where the image is seen at correct scale, correctly oriented, ...
Action/Sports finders provide a no-compromise optical solution; high eye point viewfinders represent the most efficient design which, in well designed housings, offer the fullest image size but without the corners being visible; ...
There is almost always a magnifier you can pop out for focusing by usually pushing in a little on the front of the hood. Also there is almost always a sports finder put into use by pushing the front of the hood in and up, ...
Parallax
The disparity between viewing and imaging angles when they are not identical, as with sports finders or twin-lens cameras.
 See also: Focus, Frame, Finder, Image, Type
  
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