In article <01bb7b84$62dbeba0$bcd523c7@gateway>, blakbear@ix.netcom.com says...
>Which doubler do I need for my camera camera, (AIS)? Is there a significant
>difference between Nikon's and the aftermarket brands? (I have all Nikon
>lenses)

For the FA, which does use the "S" feature of AIS lenses, the TC201
for most lenses shorter than 300mm, and the TC301 for most lenses
longer than 300mm are the Nikkor AIS doublers to use. For 1.4X, the
TC14A for under 300mm, and the TC14B or C for 300mm and over. The
aftermarket brands of converters cannot beat the optical/mechanical
quality of the Nikkor converters (and none is made to fit the longer
lenses), though some can be good enough compromises.
Hope This Helps