A FA must have more extension than an HD, as the FA has the rear movements. I just measured my HD and I get 10.5 inches from FP to front of my 8mm top hat lens board. I need a top hat lensboard with a Copal 1 shutter and the 210 mm f5,6 Caltar II-N which gives me a full head on 4x5. But that lens will not fold inside.
I usually have a 150mm F6.3 Calter II-E with a filter mounted and that folds inside my HD nicely.
I'm not against a FA and I want one, but the lens boards are a limit and the hole in the camera behind the lens board is another. The above 210mm just fits through that hole. Some here have written of making the internal camera hole larger and mounting the rear lens element from inside the camera. A 120 SW Nikkor would need this treatment.
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