![]() ![]() Use A Focusing DeviceĪll the tips I shared above are rather qualitative and are based on your ability to eyeball the focus quality. This will make the job easier, as our Moon is large, bright, and with surface features that allow you to get a very precise focus. If you see the Moon in the sky, you can use it to focus on the stars. The better you focus, the less chromatic aberration you will see around bright stars.įor all practical considerations, the Moon, the planets, and the stars are all at infinity.The better you focus, the more faint stars will appear.The better you focus, the smaller the stars will become.There are three tale-telling signs for the perfect focus when looking at the live view image: Check For These Tale-Telling Signs Of Perfect Focus To have a better view of the stars, temporarily increase the ISO and set the camera to bulb.ĭo not change aperture nor zoom in to try to see the stars better: changing the focal length of the zoom lens and/or the lens aperture may affect the focus. Some cameras allow the image shown in the live view to change accordingly to the camera settings. Instead, rely on the live view to magnify the image of a bright star. The optical viewfinder is useless for focusing on stars. Simply set the focus close to the infinity mark or focus ⅓ into the scene and you should have everything in focus. Thanks to the huge depth of field from my fisheye lens, I just set the focus to the infinite mark to have everything in focus, from the foreground to the stars. This is because you can rely on the wide depth of field these lenses have to offer. With wide-angle lenses, focusing on stars is rather easy. The infinite mark on the lens also is not accurate enough.įinally, some modern lenses focus by wire, meaning the focusing ring has no hard stop nor a distances scale. Some people like to pull back a little from the hard stop: while this can work with fisheye and wide-angle lenses, for anything longer, this method is sloppy. More often than not, the hard stop sets the focus “past” infinity and your stars will be blurred. ![]() Most lenses have a hard stop on the focusing ring. Star size, live view, the Moon, and Chromatic aberration are few of the things to use and look for when focusing on the starry sky. Here is a list of a few simple tips to help you focus on stars. So, what to do? Few Tips To Help You Focusing On Stars Defocused stars look like little balloons.Īnd this is not surprising: stars are small and faint points of light, autofocus will not lock on them more often than not, and focusing on distant street lights is not always possible or accurate. If so, welcome to the club, as this is one of the most common challenges we have to face: we all struggled with that. If you just started with photographing the night sky, regardless if you are using a simple tripod or a tracker, you may struggle with getting your stars in focus. 7) Conclusion A Common Problem In Astrophotography – Trying To Focus ![]()
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