How to understand focal length of camera lenses

10012021 Focal length is the distance between the optical center of the lens and the camera sensor or film plane when focused at infinity. You can zoom in on your phone but thats not changing your focal length. I want to use it with my ASI533MC astronomy camera. - posted in Beginning Deep Sky Imaging. Ranging anywhere from 8mm to 2000mm there is a wide variety of focal lengths for photographers to choose from each of which are better suited to different genres of photography. This value is most commonly measured in millimeters.

Smaller numbers have a wider angle of view and show more of the scene.

• posted in Beginning Deep Sky Imaging. First of all youll see the range of the focal length that the lens can achieve in the name of the lens. What lens shall I buy. All lenses show the focal length right on the lens. Usually expressed as follows. 26012019 The focal length range of a lens is expressed by a number and that number tells you how much of the scene your camera will be able to capture. 11072019 Focal length is the distance between the optical center of the lens and the camera sensor or film plane when focused at infinity. The optical center is where light rays converge inside the body of your lens. Thats just cropping your photo before you actually take it photographer Derek Boyd points out. The ASI533MC uses a IMX533 sensor that is 113x113mm square so this is different than a full frame or aps-c sensor. The focal length tells us the angle of viewhow much of the scene will be capturedand the magnificationhow large individual elements will be.