>>3899498>how do you get Ghost Two Mirror before Just The Actual Light With One Mirror.you take two existing technologies and combine them
the rangefinder 1890s
https://en.wikipedia.org/wiki/Coincidence_rangefinderand the camera then put them together like in that kodak in
>>3899493the SLR with 1 mirror as you say needs to have a mirror that flips out of the way or you have the added bulk of a TLR
traditional ground glass is also not that bright so with small format like 35mm it's not that great