Short form in German for "freundlich Grins" (engl. kindly smile)
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FG Syndrome is always present at birth, although it may not be identified at that time.
Some things to look for in the mothers are: cowlicks in the front of the hair, a history of difficulties in school, spelling phonetically (she may not recognize this in herself), a tendency to have ingrown toenails, constipation, or other "soft signs" of the condition.
A mother of a child with FG Syndrome should dicuss their personal and family medical histories carefully with their geneticist, asking about these subtle signs to be absolutely sure that she is not a carrier before giving her a reduced recurrence risk.
The FG is about half the size of an F5 and about a third of the weight.
The FG's controls are well-placed, with ISO and exposure compensation settings around the rewind knob and a shutter speed dial (B, M90, 1-1/1000, locking A and P settings) coaxial with the wind lever.
It appears that the FG determines that a lens is an AI-s (rather than AI) by the presence of the absolute aperture lug on the lens.