The shorter the focal length, the wider angle the lens. Short focal length, wide angle lenses produce a smaller image size at the sensor allowing you to use longer shutter speeds without creating star trails from the Earth rotation.This trait lets you collect light from a larger area of the sky and offers a balancing compromise to a typically small clear aperture for light gathering capability. Wide angle lenses have a larger field of view (FOV) and allow you to frame more of the Milky Way.These wide angle lenses offer some advantages when shooting images of the Milky Way: Finally, about 16mm and shorter on a 4/3 camera will do best. ![]() I usually suggest something 24mm or shorter on an APS-C camera or 35mm or shorter on a Full Frame Camera. What Focal Length?įor simple non-tracked landscape astrophotography and nightscape images, you will generally want a wide angle lens. There are two basic traits of a lens that will affect how to take your landscape astrophotos: focal length and clear aperture size. Let me explain what sort of thinking should go into choosing and using a lens for making astrophotography and Milky Way nightscapes. There are a number of lens traits that will determine the quality and usability of a camera lens for astrophotography. We outline all the most important traits of a great astrophotography lens in this complete guide. ![]() The lens is the most important factor in the image quality of a landscape astrophoto.
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