In fact if the photo you re viewing isn t too large you can probably get acceptably sharp results even when the foreground is 5 feet away especially if you focus a tad closer than the stars blurring them ever so slightly. Capture daylight test images while using the widest possible aperture value.
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To use the rule you need to know the focal length of your lens.
How to get sharp stars in photos. It s important not to rush here really pay attention to how the star looks on your camera s lcd so you re assured to get the sharpest photo. Using live view zoom in on the star and then with your lens in manual focus adjust the focus ring back and forth until the star looks sharp. Unfortunately you cannot just pick whichever shutter speed gives you a.
Usually super telephoto lenses such as the sigma 150 600mm f 5 6 3 dg os hsm perform the best from 150mm to 500mm and as you go beyond 500mm the sharpness starts to. Astrophotography tips for beginners. That number is then used to divide 600 to get the maximum exposure time for that focal length.
For example if you re using a 14mm lens you d divide 600 by 14 which is approximately 43 seconds or the longest shutter speed you can use before star trails start to emerge. In this case the focal length would become 750mm with a nikon aps c sensor camera and thus a shutter speed of 1 750th of a second or faster needs to be used to get sharp photos. If you want the stars to be sharp and in focus you need to learn how to focus to infinity.
How to get sharp and in focus stars in starscape photos infinity does not always mean perfect star focus. Balance your shutter speed for sharp stars. If you re using an ultra wide lens like 14mm and you focus on the stars you ll still get fairly a fairly sharp foreground for anything that s 8 10 feet away even at f 2 8.
An important thing that you need to know about getting sharp stars in. Every lens seems to have a slightly different spot when focusing to infinity or near to infinity. 14 pointed star around a nearby star todd vorenkamp.
In general to get the star effect the sun will be off axis but when composing take care to not swing the lens directly at the sun. Try focusing in daylight and learn the infinity focus point of your lens. If the scene is still too bright for a dslr viewfinder try the live view mode if available.
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