Originally posted by Eruditass .... it will do P-TTL with all lenses?
Will this also allow trap-AF with all lenses?? I assume the aperture information will just be plain wrong?
.....
Yes, All lenses will do P-TTL.
Aperture info in the EXIF will be unrelated to actual lens aperture.
The reason to set the viewfinder F-stop to the lowest value is to prevent the camera's trying to close the lens' aperture at exposure time. This is important because if the camera thinks it will be closing the aperture when shooting it will calculate the wrong exposure time.
The physical downside of this method is that the viewfinder image dims as the lens is manually closed at composition time. The upside is a huge range of early Pentax and adapted third party lenses can be more easily used (auto exposure& P-TTL flash).
The Green Button can still be used to accommodate SMC, K, & M lens exposures I think.
Dave in Iowa
Last edited by newarts; 11-18-2009 at 05:43 AM.