...how is the photomic meter? what pattern is it, center weighted?
There were a number of rather different Photomic finders made for the F and they vary widely in their function though all couple to bother the shutter speed dial and the lens' f/stop ring.
Photomic (original version, "F-1" in the repair manuals): external CDS (Cadmium Sulfide) meter cell with significant "memory". The power switch was integrated into a swinging "flag" that covered the meter cell when off in an effort to mitigate the memory issue with CDS cells. This is not a TTL meter. It had a very wide metering angle and there was a screw on incident disk and a screw on narrow angle mask.
Photomic (version 2, "F-2" in the repair manuals): external Cds (Cadmium Selenide) meter cell with vastly less of a memory problem. Power switch moved to a simple latching button arrangement. Like the F-1, this is not a TTL meter and had the same screw on attachments.
Photomic T: Nikon's first TTL Photomic head. It was considered an "averaging" meter and had a fairly even response to the whole finder area.
Photomic TN: Nikon's first center-weighted finder. It had a 60/40 pattern with 60% of the sensitivity in the center 12mm diameter area. Contemporary focusing screens began marking this 12mm circle.
Photomic FTn: Introduced the "Nikon Shuffle" form of semi-automatic indexing of the lens' maximum aperture. The two previous TTL finders required that the user manually set the desired ASA (now ISO) opposite a mark for the maximum aperture of the lens attached rather than having the now standard single index mark.
All of the above used a conventional carbon resister element for the mechanical>electrical interface with the exception of the very last few FTn finders made during the last year of production. These very, very late finders used Nikon's "Functional Resisting Element" (FRE) which significantly reduce the problems of wear that resulted in needle flicker when adjusting controls and eventually inaccurate readings or total failure. A modest number of earlier FTn finders acquired the FRE when sent in for major repair involving a failed carbon resistor gear.