I want to add a longer prime to my Sony 50mm and 28mm lenses for the A900. Around 90mm with macro capability and for portraits.
I used to have a Tamron 90mm when I had a 5D and thought this an excellent sharp lens (although a little lacking in build quality perhaps). I will probably get one for the A900.
Before I do does anyone have any thoughts/experience with other options (I am thinking about the Sigma 105mm and the Sony 100mm macro.)