D100 DoF preview stuck?

[Viruside]

Greetings,

I borrowed a D100 this weekend and I was changing lens from a nikkor to a nikkor and this very strange thing has happened. I have no idea if it's a menu item that I mistakenly set or what.

When the lens is attached it is as though the depth of field preview button is stuck shut. It's quite wierd. If you look through the viewfinder it is stopped down to f32 or the max. I also have a 70-200 f2.8 sigma, which I then attached and it does NOT have this problem. It works just as it should. But both the 18-70 and the 80-400 (both nikkor lenses) will remain stopped down. This is also throwing off the light metering. I focused on a light bulb and it gave me 1.6". I'm really at a loss, so if anyone has seen this before could you please let me know!

Thank you so much for any help

[coldrain]

Does this have to do with an aperture ring of the lens not being in its correct position?

[Viruside]

I looked at the ring last night and couldn't tell if there was something missing. I'm really lost because the sigma works but the nikkor lenses do not.

Any idea if replacing the aperture ring would fix it?

[coldrain]

I do not have a Nikon DSLR but I know that the aperture ring should be set and locked on the smallest aperture value, like f22 or f32. The aperture ring is not for use on the DSLRs but is intended for some older film SLR models.

[dad_of_four]

I looked at the ring last night and couldn't tell if there was something missing. I'm really lost because the sigma works but the nikkor lenses do not.

Any idea if replacing the aperture ring would fix it?

Unless it is the newer "G" lenses, you need to manually turn the aperture ring to the smallest aperture, and then slide the lock-switch to lock it in place. The lock switch is located right next to the aperture ring

[K1W1]

Since when has the 18-70 lens had an aperture ring?

[Viruside]

The 18-70 does not have an aperture ring.

I also have the ring turned to the orange on the nikkor and the max and locked for the sigma.

The latest developments in this case are this....

I took the camera, lenses and all to Wolf today. Hey, it was all I had. Tried other lenses on it, and they worked just fine. Tried another 18-70 lens and it worked fine. Long story short, it appears that the aperture hook/catch/flange on the inside of the D100 is bent. Dunno how in the world the SAME lens works fine on it, but it's true. Basically, what it appears is that I need to get the entire internal portion there replaced. Of course, since the D100 is older, there was not a body on the shelf that we could compare the flange to, to confirm that it was infact bent, however we attached my 80-400 and then attached his and noticed that since the flange is bent that it slightly scored the bottom portion (no glass) on his 80-400.

Also, we noticed that the diameter of the material surrounding the glass on the lens...if you picture looking from the camera perspective (this view might have a name, sorry) and the glass is interior and then there is a ring of 'something' before the metal contact/control ring. This ring is a different diameter on each of the three lenses. We could only assume that's why the 80-400 was scoring while the other two (80-200 sigma and 18-70 nikkor) were unscathed.

415 was the dollar figure he found out for me for what it would cost through him. I'm still going to call the former Nikon repair center up in IL to find their cost.

This is kind of where I'm at on this. I would love it if someone has a D100 that could take a picture of the body looking inward to the film/ccd plane and specifically the flange that catches the aperture on the lens. Preferably a straight on approach so that I could see if it's F'ed up like mine (and therefore not the problem) or if it is indeed this piece. Is it flush against the tunnel wall or does it jut out into the shutter area evvvverrrrrr so slightly.

Gah...if only the D80 were out already and I wasn't borrowing equipment.....

Thanks for the input. I'll upload a pic of the D100 showcasing the issue that we think is the culprit.