I didn't know where to post this question, so I posted here!

I recently acquired a Sigma 28-70mm f/2.8 to sling on my D80. It's the first non-Nikon I've ever acquired for any of my Nikons. Everything seems to work fine, except I can't seem to get the lens to go below f/3. Does anyone know why this might be? What can I do to get it to go all the way to f/2.8 (I know this isn't a helluva lot of difference, but hey, it should go to f/2.8, right?)

Thanks in advance for your help.

Brian

Does the diaphragm snap open and closed freely?

Can you manually close and open the blades mechanically?

__________________
See my user profile for gear information. Then forget about that stuff and go take pictures! And then some more pictures!

In short, yes and yes.

I was thinking it might have something to do with a camera setting and not the lens.

Brian

Have you pulled the battery, restarted? Do you have any other lenses that go wider than f/2.8?

__________________
See my user profile for gear information. Then forget about that stuff and go take pictures! And then some more pictures!

Again, yes and yes. Pulled the batteries, cold switched it on to flush residual energy in the camera, reinserted and restarted.

A Nikon 50mm f/1.8 work fine.


BVS

I would have to refer you, at this point, over to Photo.net or one of the more fleshed out forums with more Nikon users.

Sorry that I couldn't help.

__________________
See my user profile for gear information. Then forget about that stuff and go take pictures! And then some more pictures!

When the Tammys are new they throw f errors and the AF jams up. After a number of mount and remounts and the contacts get more worn in the problems go away. Maybe you're experiencing a bit of the same thing.

__________________
Throw a little light. If it doesn't come back, it probably fell off...
Cheers
John
Flickr
Nikon D80 (nicknamed Cylopsoid)
Tamron 17-50mm f2.8 Lovin' it. I could glue it to my camera and be happy.
Tamron 28-75mm f2.8 It's the older model w/o the AF motor and it focuses FAST. It's just like the 17-50, only longer.
Nikkor 50mm f1.8d <------creammmmmy
Nikkor 18-55 kit Now in a deep slumber.
Quantaray 28-82 Somewhere in the house.
Nikon N65 Back for the resurrection tour! Coming to defend the faith...
(This spot being saved for hopefully a G9 or G11) Shhhh, I know those are Canons...