Nikon/ Tamron compatibility?

[filmcrazy]

OK so I just got a Nikon n80 after 10 years of owning a completely manual SLR. How much do I love this Nikon? A whole lot!!! BUT, I have one rather strange trouble with it when I use my AF Tamron (28-80) D type lense. The lense apeture itself opens to f3.5, but when I try to change the apeture setting through the body the largest I can get it to go to is f5.6. Weird huh? Has anyone else had this happen and if so, do I have any hope of fixing it? Comments, suggestions, am I missing something.....

[mtbbrian]

From what it sounds like, the f/stop changes from f/3.5 to f/5.6 when you zoom through the lens. Right?
If that is the case, DON'T WORRY! It is a "symptom" shall we say of zooming on a zoom lens.
It is happens mostly with "consumer lens" it happens with all consumer lens regardless of the name.
Make sense?
Hope this helps!
Good Luck!
Make sure you check out the other forums.
Brian

[another view]

Brian's right. Unless it's a pretty big and heavy lens it's probably not a constant aperture lens. This means that it might be f3.5 at 28mm, but the maximum aperture at the long end (80mm) is f5.6. This varies from lens to lens - I have a 28-105 Nikon that's f3.5 to f4.5. It's the same way on a manual camera but more obvious on something like an N80.

[filmcrazy]

Mystery solved!! Thank you for your help!