![]() ![]() ![]() These factors include sensor size and resolution as well as where the camera is pointed in the sky relative to the celestial equator ( declination). There are factors other than just focal length that affect the amount of star trailing in a photograph. The 500 Rule works relatively well for determining an approximate exposure time but it’s a little too simplified for what’s actually going on when photographing the stars, especially if we want to minimize star trailing or maximize light gathering. For example, for a 20mm lens, we would want a shutter time of 25 seconds:Įxample: 500/20 = 25 second shutter The Goal: Minimize Star Trails The 500 Rule is simple: Take 500 and divide it by the focal length of your lens to determine your shutter time. Limiting the shutter time with the 500 Rule helps reduce star trailing while also allowing adequate light to enter the lens. More of a guideline than a rule, the 500 Rule tells us a rough recommendation for limiting shutter time. My tutorials here and here recommend determining shutter speed based on this “500 Rule” concept. Recall: The 500 Ruleįor photographers that are just learning astrophotography, I’ve very often recommended using the 500 Rule (calculator) to calculate shutter time. String Lake, Grand Teton National Park, Wyoming. How the Calculator Works Using the proper shutter time keeps the stars looking like sharp pinpoints. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |