Hard to focus in low light is probable more of a problem with my Sony a7. Even when using my BIG Sony flash, its hard to focus in low light because there is no IR Preflash focus assist

This lens is awesome when it's on .... but do to some focus haunting and slow focus I had to knock it down a star

I bought this lens in the spring before my 2 week vacation. It worked very well. I am sure there are better lens out there but for the money its a great lens.

Ore testing is required. I bought this to have a more portable option to the f2.8 but I think it may not be as sharp, but certainly is more affordable.