Hi,

I was attempting to sell this lens. I have never had a problem with it before, yet when used for the first time in a while to try it out on a Nikon D700, the exposures when stopping down but maintaining an equivalent exposure got brighter. An exposure at f2.8 was correct, but an exposure metered correct at say f-22 was not. What is wrong with my lens? Will it be expensive to fix?

-Joshua