On Wed, Jun 22, 2005 at 08:44:28AM -0700, Godfrey DiGiorgi wrote: > > On Jun 22, 2005, at 7:59 AM, Steve Jolly wrote: > > >Doesn't a TC alter the lens aperture information provided to the body? > > No. [...] > > Godfrey
The Pentax 1.7x AF adapter does alter the maximum aperture information; it shows my 300/2.8 wide open as f4.5 But it's the exception; I don't know of any other TCs that do this. A full AF TC, with the digital signal pin contact, is unlikely to be able to change aperture information; Pentax haven't released a specification for how lens-to-body digital signals are encoded.
