Upload & Sell: Off
Have you considered that it's prob just not a very sharp lens?? Whether or not the "default" adjustment, when combined with the "saved value" (per lens), made the sharpness better, while surprising, is still incorrect. Unless, of course, you want to change the AF fine tune settings EVERY time you change lenses, using the "default" af fine tune will throw off EVERY ONE of your lenses...unless, of course, every one of your lenses is out the exact same amount, and in the same direction..It's best to do them all separately....
you did mention that the 70-300 Nikon was perfect....was that with ZERO af adjustment of any kind, or was that with the "default" af adjustment value changed??