Love this lens. Got it for outdoor sports, but wondered what it could do with a full moon. This image is cropped with contrast and Lightroom's bumped up quite a bit, shot hand held with a 1Dx at f5.6, 1/1000, ISO 1600.
At full resolution, the stars come out. Curiously, I took additional shots with a 5D3 at ISO 800, but the stars weren't as prominent. But, could some of these "stars" be randomly excited pixels?