Focal length is a property of the lens itself, not the camera. For example, a 50mm lens is a 50mm lens, regardless of whether on a full frame, cropped sensor, or medium format camera. However, the size of the sensor does play a role in how your photos will look at a particular ...
We often use focal lengths to describe the size of the lens. This optical measurement refers to the shape of the lens, not its physical dimensions. A technical definition of lens size is the distance between the rear nodal point and the focal point of the lens, while the lens is focused ...
First of all, it is important to know that we are not talking about your camera when we refer to focal length. The camera of course plays an important role, but it is the job of thelensto take the light and focus it at a particular point. The light from the scene hits the object ...
Focal length and dioptersRefraction is the property that some transparent means have to deflect light. The lenses are used to correct visual defects. The graduation is measured in diopters that indicates the refractive power of the lens. To solve the following problem it is...
The aperture will determine how bright the object will appear, as a larger diameter telescope can gather more light at once. An 8-inch Dobsonian Telescope with a focal length of 1200mm at F/5.9. What is The Best Telescope? I am a full-time astrophotographer, and I have used many ...
A unit of measurement of the optical power of a lens or curved mirror, equal to the reciprocal of its focal length in meters. His eyeglasses were prescribed with a diopter of +2.50 for reading. 2 Telescope A telescope is an optical instrument using lenses, curved mirrors, or a combination...
Answer to: The focal length of a smartphone camera lens is 2.5mm. What is the distance from that lens to the image of an object that is very...
and speciality lenses can extend outside this range as well. A 10mm focal length would be a very wide lens (capturing a lot of the scene), and 500mm would be a very narrow lens (capturing only a small part of the scene – giving a large magnification like binoculars or a telescope)....
What is field of view? Field of view is simply the observable area that you can see either through your eyes or an optical device, such as a camera lens or telescope. The official definition according to Wikipedia is "the extent of the observable world that is seen at any given moment"...
17 eyepieces is not too many. What I do is put them in rows in an Excel spreadsheet sorted by focal length, then the telescope focal lengths in columns. I use the Fill Down feature to calculate the magnifications in the empty cells below. It's a good way to check for duplicate magni...