NIGHT SKY PHOTOGRAPHY APERTURE 3.5 HOW TO

Olympus OM-D EM-10, 150mm, f/4, 3.2 seconds, stack of 50 images. While the level of details will not be impressive, it will be a very satisfying experience. With this guideline, you can even get decent results when photographing bright deep sky objects such as M42 (The Great Orion Nebula) using a telephoto lens. Star trails from a 3-minute long exposure with 50mm lens on Olympus OM-D 10. This exposure time is much longer than the rule suggests.

The image below shows how much stars are trailing when I use a shutter speed of 3 minutes with my 50mm lens on my Olympus. With a full-frame camera with the same lens, the result will be: With a 50mm lens, for example, the guideline will tell me the exposure time for which the stars will not trail. LetвЂ™s consider my Olympus OM-D EM-5 Mk II micro four-thirds camera. It is an arbitrary constant chosen so that the guideline will work in most cases.

2.7 or higher for compact cameras with a 1вЂі-type sensor or smaller.ДЄs far as I know, while it can be related to image resolution and field of view at a specified focal length, the number вЂњ500вЂќ doesnвЂ™t have an actual meaning.

1.6 (1.5) for Canon (Nikon) APS-C cameras.

Here you can find the crop factor for different types of cameras: FL is the focal length expressed in mm and CF is your sensorвЂ™s crop factor, i.e., the ratio between the size of a full-frame sensor and yours.

The rule reads like this: SS = 500 / (FL * CF)

NIGHT SKY PHOTOGRAPHY APERTURE 3.5 HOW TO

If you are an occasional star shooter, knowing how to use the much simpler 500 rule will let you capture trail free starry skies. While this is not rocket science, the formula that links all those variables together is not the simplest one to remember and to use in the field. To be rigorous, the length (in mm) of a star trail on your image will depend on the field of view, sensor size, image resolution, exposure time and the star angular speed and declination. In astrophotography, we make a big deal out of freezing the stars.

Night sky photography aperture 3.5