![]() ![]() ![]() You can read more about stacking in this article. Stacking, also known as image stacking, is a technique consisting in taking many images of the same target, so to combine later in post-processing to produce a cleaner and more detailed image. ![]() Luckily there are handy calculators for your phone, the best of which is probably PhotoPills. This is a more complex and accurate formula than the 500-rule but is more complicated. The NPF rule is another empirical rule to determine the maximum exposure time to have pin-point stars when photographing without a tracker. If you still see stars are trailing, you can switch to a more conservative 400-rule, where the number 400 replaces 500 in the formula above. With a 50mm lens on a Canon APS-C camera (CP=1.6), the maximum exposure time will be 500 / (50*1.6) = 6s. The 500-rule is an empirical rule you can use to calculate how long you can expose the starry sky from a fixed tripod before stars will trail noticeably.įor a given focal lens, FL, and a camera sensor with a given crop factor, CP, the maximum exposure time, ET in seconds is: ET = 500 / (FL*CP). You can read here our review and here our ultimate guide for this tracker. The SkyWatcher Star Adventurer PRO is one of the best, affordable trackers for astrophotographers. ![]()
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