Nikkor AF-S 14-24mm notch missing allowing mount damage

[Garbz]

Can anyone explain why there's a mechanical stop missing from the Nikkor AF-S 14-24mm G ED? A picture showing the lens against a Nikkor AF-S 18-200mm f/3.5-5.6 IF-ED G, MicroNikkor 105mm AF f/2.8D, and a Nikkor AF 85mm f/1.4D is shown below.

The 14-24mm is missing a small mechanical stop. This allows you to turn the lens past the white dot on the camera when unscrewing and continue rotating causing another part of the F-mount to cut in right above the electrical contacts for the lens. The lens works just fine but I can see long term if I'm not careful the electrical contacts will likely fail.


Anyone know the reason for this or can give examples of other lenses missing these stops?

 

[tirediron]

Odd - I haven't used one in a while (and don't have one in my bag at the moment), but I don't remember being able to rotate it farther than normal when mounting it.

 

[480sparky]

Are you sure that's the reason the lens turns so far? I have several lenses that don't have such a part, and I don't have an issue with any of them turning to far.

 

[Garbz]

Are you sure that's the reason the lens turns so far? I have several lenses that don't have such a part, and I don't have an issue with any of them turning to far.

I was 100% certain. Until I read your post and now I'm 100% wrong. Well done sparky

Right underneath that tab I blamed is an M0.8 screw which sits proud into the mount and hits one of the three overhanging pieces in the F-mount. The screw is missing from my lens.

Since you mentioned you have others like that do you mind sharing which ones? I'm interested now what that tab does.

 

[480sparky]

...........Since you mentioned you have others like that do you mind sharing which ones? ........

They're mostly my old glass... the mirror 500mm & 600, my Ai lenses...

.......... I'm interested now what that tab does.

Whatever it does, it doesn't do anything to any of my cameras. It ends up in about the 5:00 position of the body's mount as you look at the front of the camera. My Kenko extension tubes have a spring-loaded tab that engage it, but there's nothing the the bodies I have that appear to do anything with the tab on the tube.

Perhaps some sort of backward adoption for older bodies?

 

[Garbz]

Thanks.

My google-fu did well today. The notch is the lens speed indexing post. It tells AI cameras what the maximum lens speed is. Thus the notch isn't actually needed on G series Nikkors as they can't couple to AI cameras anyway. There's no aperture control.

 

[Sw1tchFX]

Are you sure that's the reason the lens turns so far? I have several lenses that don't have such a part, and I don't have an issue with any of them turning to far.

I was 100% certain. Until I read your post and now I'm 100% wrong. Well done sparky

Right underneath that tab I blamed is an M0.8 screw which sits proud into the mount and hits one of the three overhanging pieces in the F-mount. The screw is missing from my lens.

Since you mentioned you have others like that do you mind sharing which ones? I'm interested now what that tab does.

Those have a tendency to fall out. We've replaced dozens in the rental house.

 

[Garbz]

Not surprised. The thread engagement is horrible, about 4 threads deep. I pinched the screw from another lens I haven't used in months.

 

[Sw1tchFX]

Not surprised. The thread engagement is horrible, about 4 threads deep. I pinched the screw from another lens I haven't used in months.

It's a surprisingly shoddy design...