Sony 70-300 SSM G question
I'm considering getting a Sony 70-300 SSM G for use with extension tubes as a marco/closeup lens for insects such as dragonflys and butterflys. I am using kenko tubes with my tamron 200-500 at the moment. The shots have been fairly good except that with 2 or more of the tubes attached and the lens won't Manually Focus. The focus ring won't turn, or barely turns, not smoothly. I've been able to get it to work using AF to get close to focus, then switching to MF and turning the barrel, (changing focal length to achieive sharp focus. Light has to be optimum for the lens to pinpont AF with the Tamron when connected to the tubes. The Tamron is not really suited to do this though I've gotten a few nice shots using it this way.
Has anyone used the Sony 70-300 SSM G with extension tubes? If so how well did they work? Thanks in advance for any info.