To capture clean images of the night sky you have to get as much light onto the sensor of your camera as possible.
To capture clean images of the night sky you have to get as much light onto the sensor of your camera as possible. And to achieve this it’s important to use a lens that allows for apertures of f/2.8 or wider. The most commonly used lenses for Astrophotography often have apertures of f/1.8 or f/1.4. But even with the f/2.8 of the Canon RF 15-35mm lens, which I’m using, I can achieve high quality results. Before switching to that lens I was also able to capture a few night photos with a f/4 lens on my Canon 5DSR – but I can tell you, it was much more work to get the results I was after.