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Results tagged with optics
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user 32811
Optics is the science of light, and in photography often refers more specifically to to the properties and construction of lenses or the technical aspects of light sensors.
6
votes
Accepted
Background warping through foreground defocus
No, this is not diffraction.
Let's start by recalling how the image is formed by the lens (focused and defocused):
Each point of your large aperture lens contributes to just one point of the defocu …
- 5,069
6
votes
Accepted
How can I fire two cameras simultaneously with different settings but the exact same view?
You can try semitransparent mirror:
- 5,069
6
votes
How do lenses control "projection"?
The assumption that aspheric lenses create "abnormal" projections is incorrect.
There is nothing "normal" in normal spherical lenses, except that we can produce them cheaply. You don't get rectilinea …
- 5,069
6
votes
Accepted
Why is low chromatic aberration considered important in the digital era?
ideal image - no abberration:
simulated chromatic aberration:
correcting the chromatic aberration by adjusting the RGB channel positions (in a more realistic example this would also involve stre …
- 5,069
5
votes
Technically, why is the out of focus area blurred more when using a bigger aperture?
The other answers incorrectly associate the blur effect with some lens properties. You don't have to assume anything about how the image is formed by the lens or even that a lens exists.
The scene si …
- 5,069
3
votes
Why do mirror lenses have poor contrast?
Contrary to the popular myth, only local contrast (i.e. sharpness) drop is caused by central obstruction and its associated point spread function. The difference between refracting and mirror lens is …
- 5,069
0
votes
Does on-sensor phase detection autofocus need adjustment for accuracy?
It does not depend on the sensor type (dedicated PDAF vs image sensor PDAF).
The need for adjustment comes from the fact that the phase-based autofocus works by using sensor data to determine the abs …
- 5,069