High ISO for shooting starry skies

12Astrophotography is hugely popular and requires just a few techniques for success. You’re definitely going to need a tripod and ideally a fast wideangle lens of f/2.8 or more. An f/4 lens would still work, but you’d need to use a higher ISO. Manually set the lens to focus on infinity, and shoot in manual mode with the shutter speed around 25secs and the aperture on the widest setting. The ISO should initially be set to 3200 and then take test shots to refine the exact setting. You have to use a high ISO to avoid the shutter speed being so long that stars begin to streak.