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Aperture effect on Full Resolution Sample



Frage von Keff:
November 2005

... There's not. And there lies the problem. It is generally all Lenses with iris diaphragm. What is entirely unclear to me: If I join the Aperture for example, something - why has no effect on my Full Resolution Sample? The logic would have to close by the Aperture but my picture will be cut off from the edge of her circle always next.
Sure, the aperture controls the intensity of incident light - as happened with ND-filter geleichmäßig over the entire surface of the painting, we understand still - but if I am from the edge, just more and more "cutting away" (ie, the aperture close) The picture is evenly dark. Why is this so?

Thanks for inspiring ideas
Keff



Antwort von molch:

Hello,
this is so, that just do not think so much light, but the stretch running between object (synonymous at the outer edge) and point on the lens, the light that always occurs to the image center, ie the center of the aperture.



Antwort von Oldie:

Here it is presented very nicely:
http://de.wikipedia.org/wiki/Picture:A4_blendenwirkung.jpg








Antwort von Keff:

Unfortunately, in the graph the amount of light is shown for only one point, but not for at least two.
Oh, that's all so vividly ... : (



Antwort von Keff:

"molch" wrote:
... However, the stretch running between object (synonymous at the outer edge) and point to the lens, in the light always think of the image center, so the center of the aperture.


Ähhm .... each pixel? If before all go directly through the middle, it would still be no preference, is how open the aperture as long as it is open at least a hint.



Antwort von Stefan:

The picture is very well known and clearly.

Imagine the head of the arrow as a red light dot in front. From there, the light rays go to Lens and then out of the film.

In the case of open aperture to reach many rays of light (bright-red + dark-field area), the Lens and almost closed aperture (only dark red area) a few.

In both cases, a Picture of the arrowhead on the "film will be produced, although the Aperture really seems to obscure the arrowhead.

A similar picture could be made of the end of the arrow, but then the drawing is confusing.

It opened with the "breath" is basically correct. But in highly closed Aperture synonymous only very little light reaches the film. This gives problems when recording in the twilight ... Versa, the less depth of field at open aperture is often a way for picture composition.

Good luck
The fat Stefan



Antwort von Erich:

Hello!
The Aperture is built into the lens, of course s.einer place s.der the light rays are widely dispersed, so that all pixels of the Aperture to be influenced.
Greeting!
Erich



Antwort von Martin:

"Keff" wrote:
... There's not. And there lies the problem. It is generally all Lenses with iris diaphragm. What is entirely unclear to me: If I join the Aperture for example, something - why has no effect on my Full Resolution Sample? The logic would have to close by the Aperture but my picture will be cut off from the edge of her circle always next.
[...]
Thanks for inspiring ideas


A lens is shown in first approximation a Lens - as synonymous been cited in the Picture. The light is diffracted by the object s.jeder body of Lise and meets when there is a point light source, the focal point. For two point light sources to meet the rays of the two light sources each synonymous in the same distance of the lens, but not in the same point. In reality, the picture is displayed in the focal plane.

The Aperture is now practically reduced the lens, and it just falls only less light through the lens at each point.

As an experiment makes sense to be (like 2 or 3 different colored light bulbs, a magnifying glass, a piece of paper and a couple of different sized perforated disks as large as the magnifying glass, but take different-sized holes in the middle) to recreate the situation and simply :

The 3 light bulbs arranged in a triangle around in about equal distance from the "Camera". The camera consists of a lens (magnifying glass) and the sensor) (piece of paper. So it should now be possible to produce skillful arrangement of the two objects a sharp image of the 3 bulbs. Now the "Aperture can be reduced" by a perforated plate is placed between the lens and paper. The Picture will be correspondingly darker, but s.der order of points and s.der relative brightness will change nothing. The aperture can be moved within certain limits even to the edge of the lens, without any great s.Picture something changes.

Perhaps arises as the "aha" effect one :-)

Greeting
Martin



Antwort von Keff:

I'll certainly try it ... Morning. ;)

No, Thanks for the note - that sounds like that actually could get the "aha" effect.

Thank you!




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