The 500 rule is critical to remember for astrophotography because it helps you determine the maximum shutter speed you can use without getting star trails in your images. Star trails occur when stars appear as streaks or lines in your photos, rather than as pinpoint dots of light.
Slow shutter speeds allow more light into the camera sensor and are used for low-light and night photography, while fast shutter speeds help to freeze motion. Examples of shutter speeds: 1/15 (1/15th of a second), 1/30, 1/60, 1/125. Aperture – a hole within a lens, through which light travels into the camera body.
The light meters in film cameras are generally much less sophisticated than those in today’s digital cameras, and they are easier to fool. The Sunny 16 rule provides a quick reality check on your meter readings, as well as a starting point to set exposure without the help of a meter. How the Sunny 16 rule works
If you will be using a 24mm f/2.8 lens on a Nikon D750 camera, then using the above NPF rule, the shutter speed will be approximately equal to {(35 x 2.8) + (30 x 5.97)} ÷ 24 in seconds ≈ {98 + 179} ÷ 24 seconds ≈ 11.54 ≈ 12 seconds. If we had calculated the exposure time using the 500 rule, it would have been 500 ÷ 24 = 20.8 ≈ 21
Per the 500 Rule, I should be able to shoot a 35-second exposure maximum ( without seeing star trails ) at 14mm focal length using a full-frame camera. Although this is what the 500 Rule recommends, I tend to prefer shooting in the range of 20-25 seconds for much sharper images.
for a full frame sensor use the 500 rule. for a aps-c sensor use the 300 rule. so 500/300 devided by your focal length. the answer is your shutter speed. Reply Shinpah •
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camera 500 rule
