I have a canon 10-18 I want to use with my Sony a6000. I went out tonight to get photos of the stars but I can't figure out how to get it to focus on the stars. I have to use manual focus since it's on an off brand camera (I used it on my 40D but I had the same problem). So I put the thing in 10mm mode and then turn the focus all the way to the right and the stars are too blurry. Same thing happens when I turn the focus to the left. I looked online and there are no tutorials for using the lens for astrophotography. The display on my camera is too small to see whether or not the stars are crisp. Any advice for getting sharp focus with this thing?