On 27 Aug 1999 19:00:44 GMT, billda@West.Sun.COM.no.sp@m (Kill All Spammers) wrote:

>The flash needs to know the aperature value for its calculations. The
>50mm f/1.2 is an AIS lens and so does not have a chip to tell the flash
>what what the aperature value is. Only AF, AI-P and AI-D lenses have
>chips.

In TTL mode, the flash aperture readouts are for information only, and do not affect exposure...