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Telescope > FOCAL LENGTH
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The following information is about FOCAL LENGTH.
FOCAL LENGTH Defined
The focal length of a thin, simple lens is the distance from the lens to the image it forms of an object that is very far away. For more complicated optical systems, the focal length generally does not correspond to any easily measurable distance. It is instead the focal length of a simple lens which would give the same size image of an object that is very far away.
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Off-site FOCAL LENGTH Links, User Submitted
The following links have been collected through user bookmark submission in the FOCAL LENGTH category. Please note, because these resources are off-site we cannot guarantee the accuracy or quality of any information.
Sun Aug 10
- Pinhole to focal length
- Jon Grepstad - Pinhole Photography: Lots of info and resources
Wed Jul 30
- FOCAL LENGTH AND WHAT IT DOES: Telescopes come with short, medium, and long focal lengths. Why isn't there a standard? What does focal length mean to the observer? Every telescope takes the light from the sky and focuses the light on a final focal plane: the longer the focal length of
Fri Jul 25
- Nikon D80 Portrait Lens Tests: compare background blur with different apertures and focal lengths
Mon Jul 21
- Applet: Lens Combination
- Wide-angle lens - Wikipedia, the free encyclopedia: For example, to get the equivalent angle of view of a 28 mm lens on a full-frame 35 mm camera, from a digital camera with a 1.5 crop factor, one would use an 18 mm[4] lens.
Fri Jul 18
- F-number - Wikipedia, the free encyclopedia: In optics, the f-number (sometimes called focal ratio, f-ratio, or relative aperture[1]) of an optical system expresses the diameter of the entrance pupil in terms of the effective focal length of the lens
Tue Jul 8
- Nabble - Papervision3D - papervision camera formula (was: screen space to 3D space...)
- The 1 Focal Length Weekend Challenge: Here's My Challenge - Shoot at just one focal length for the next couple of days. I'm a Lazy Zoom User Most digital cameras sold today come with...
Fri Jul 4
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