This article is from the Yashica SLR FAQ, by cg@evrl.xs4all.nl (Cees de Groot) with numerous contributions by others.
The FX-103 Program was an addition to the FX series after the Contax
159MM had been released. More or less identical to the FX-D, it
featured TTL flash control and two program modes (a standard mode and
a high speed mode). Contrary to the 159MM, though, it did not made
special use of the MM lenses, which have special light aperture blades
made to be controlled by camera electronics. The Yashica Program
bodies (up to the current 109MP) are all the same in this respect and
therefore can use all Yashica and Zeiss lenses in program mode.
 
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