It's a bird

by Vian Esterhuizen

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3h
answered Can I desaturate incoming light using a filter or series of filters mounted to the lens?
Jun
23
awarded  Good Answer
Jun
22
answered How is depth of field usually measured and how can I get depth of field measurements for a lens
Jun
21
awarded  Nice Answer
Jun
19
awarded  software
Jun
18
comment What algorithm can I use to simulate bokeh?
Provided the operations are all additive you wont get the problem of dark areas spreading out. It's true you need a sharp mask to get sharp circles, but the major problem is that his bokeh operation is being applied to non-linear data.
Jun
18
revised What algorithm can I use to simulate bokeh?
added 874 characters in body
Jun
18
revised What algorithm can I use to simulate bokeh?
added 874 characters in body
Jun
18
revised What algorithm can I use to simulate bokeh?
added 874 characters in body
Jun
18
answered What algorithm can I use to simulate bokeh?
Jun
18
comment Why did manufactures stop including DOF scales on lenses?
@akram The problem is DOF scales on lenses just aren't very accurate, they are based on the assumption of a very small output size (this is where the dependance on megapixels comes in, with a higher resolution sensor you are more likely no notice if something is out of focus), they also require you to estimate the distance to objects in the scene for them to make any sense. They were better than nothing in the days of film, but now it's easy to check if something is actually in focus using the LCD.
Jun
17
revised Why did manufactures stop including DOF scales on lenses?
edited title
Jun
17
answered Why did manufactures stop including DOF scales on lenses?
Jun
15
answered How to photograph a tire tread without getting a bulge effect?
Jun
11
answered Should I remove the lens hood from lenses that I put in my bag?
Jun
11
answered Why do camera phones have lenses of inferior quality?
Jun
9
comment Is it possible to digitally capture a full 3D point of view?
@null You can make guesses, certainly, which is what that paper is doing, but that's not the same as having actual 3-d data. The correspondence between two images taken from different positions does contain 3D information.
Jun
9
comment What causes barrel distortion?
I don't have a time to do the full mathematical proof right now, but you do need a FOV of at least 180 degrees to see both vanishing points of two straight parallel lines.
Jun
8
comment Is it possible to digitally capture a full 3D point of view?
@null you can guess at depth, but that's it, there's no information there, from a technical standpoint. The best example of this is that it's impossible to tell the difference between a photograph of an object (that has depth), and a photograph of a photograph of an object (which has little-to-no depth). The reason you can't tell the difference is because there is insufficient information in the image.
Jun
8
answered Is it possible to digitally capture a full 3D point of view?