Smoothy Slim
Smoothy Slim
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Rule of 500 (or 300) When taking an untracked photo of the night sky using a camera on a tripod, this rule tells you how long you can expose before the stars begin to trail. You take the number 500 and divide by the focal length of your lens. For example, if you have a 20-mm wide angle lens, then 500 / 20 = 25.
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Learn More »While many astrophotographers follow the “rule of 500” (or 300), some experimentation can help find the right exposure time for your setup. When a child is taught to ride a bike, we often put training wheels on the back; they straddle the rear wheel to ensure the bike cannot tip over while the child learns to keep their balance. Training wheels are great for building confidence and familiarity with the operation of a bicycle. What does this have to do with astrophotography? Well, there is a rule of thumb called “The Rule of 500,” that acts a lot like training wheels. And at some point, it's time to put it away. You can use the "rule of 500" to determine how long your camera can expose before stars begin trailing. But in reality, how long you can expose depends on your focal length, pixel size, and where you are pointing in the sky.
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Learn More »When DSLRs with crop sensors (smaller than 24×36 mm) came on the market, the “Rule of 500” evolved into the “Rule of 300.” Stars trailed more quickly with these cameras, so they required shorter exposures. Some reasoned that the shorter exposure times came from a longer focal length, but that still makes me squirm. If you replace the camera on your telescope with one that has a smaller sensor, does it change the focal length of your telescope? Most certainly not. The real reason those crop-sensor cameras had to expose for less time is because they had smaller pixels than full-frame cameras at the time, not because there was any change in focal length. In fact, today’s full-frame cameras have smaller pixels, so any new DSLR or mirrorless camera will be more likely to obey the “Rule of 300.” But enough about rules: If you're at that point and are ready to put away the training wheels, read on.
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Learn More »Note that you don’t need a pristine dark sky site to do this. Turn down the camera’s ISO, close the aperture a bit — do whatever you need to do to take a long exposure from your light-polluted yard and still show some stars. Now, play with the rule. You can characterize the camera-lens system for yourself and see how far you can push it before the stars start to noticeably trail. Note that you’ll want to focus on examining stars in the middle of the frame, as even the best camera lenses will add some distortion to stars near the edge of the field, which can easily be mistaken for trailing stars. Stars farther from the celestial pole will move across pixels much faster than stars near the pole, creating longer trails.
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