Re: KAF3 lens mount already here?

[Bruce Rubenstein]

The non linearity of the coupling lever was one of the changes in 
Nikon's AI-S mount. By making the ratio of lever travel to aperture 
change linear the lens could be controlled more accurately by the body. 
It really didn't matter though: the camera took an open aperture meter 
reading calculation and then did another reading after the aperture 
stopped down, but before the mirror went up. This is the reason why the 
FA has much longer shutter lag than a FE2.

BR

[EMAIL PROTECTED] wrote:

Perhaps the DOF preview was the electronic one and worked only when 
the lens was set to 'A'? Since the coupling levers on K & M lenses 
aren't linear, the DOF preview wouldn't be accurate?