Upload & Sell: Off
On the one hand it's fair and adds trust if someone tells you the lens has a slight defect when focussing manual. On the other hand what defect does your Ipad 2 have? No way that I would trade something good for something not working 100%. The 70-200/4.0L may still be a good lens, but I wouldn't trust a product with a defect, even if it's a small defect. Sell the iPad and from the revenues buy a good copy instead. There are more than enough in mint condition from owners that want to upgrade and seek their EOSfun in the newer IS version or one of the 2.8 releases.