D100 + 50/1.8AF puzzle

D100 + 50/1.8AF puzzle

I mounted the Nikon 50mm/1.8 AF (non-D) on D100 today by mistake and unearthed

a mystry!

What happens is that the shutter almost never fires when I focus at a remote,

contrasty object, say the skyline more than 500 feet away. Because the focusing

indicator is not on! But the lens does move and I can tell from the viewfinder

that it is actually focused. It appears that lens doesn't send the focus info

back to the camera. I use single area AF. The problem stays no mather which of

the five AF sensors I use.

However, it works fine when I point to an closer object ( within 100 feet) or a

less contrasty object. That is the reason I never ran into that before in

years. I always use the 50/1.8 indoor as a portrait lens.

What puzzles me is that other lenses works fine on D100. And the 50/1.8 also

works fine on N80 at infinity! I already cleaned the electrical contacts on

both D100 and 50/1.8. But it didn't make any difference!

Any ideas?

Thanks.

Steve

You can work around it with shooting in AF-C, or setting AE/AF-L to AF-ON and shooting in

AF-C.

don't think you can disable focus priority on the D100.