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Tiefenunschärfe bei dunkler Umgebung

Depth blur in low light



Frage von aight8:
August 2010

When it is dark and has no possibility to create more light so it is forced to open the Aperture. But that means at the same time you have a depth of field.

Dan is taken up with retakes always with a DOF, synonymous if you will it aim at all?



Antwort von pilskopf:

illuminate very much helps. : D Do the pros is not so different.



Antwort von WoWu:

Depths (un sharpness) you have in any case always, day or night.
But you are right, of course, that the Circle of changes in open Aperture.
Only this shows again that depth of field, contrary to some claims, no optical law but merely a determination, up to which size of the blur circle our eyes even consider recording a sharp.
But if you already have no light, you see not synonymous blur circle .....





Antwort von Axel:

If you aufnimmst with a small camcorder that has a chip half the size as your little fingernail, you need you uncomfortable about striking background blur make no head. Usually sets in low light, the automatic signal gain in the force, called gain, when it is in effect as if you had fewer but larger pixels, in the common area of the circle of confusion fit again: sharpness, fortunately!



Antwort von WoWu:

Axel, but s.Zerstreuungskreis changes the gain anything.
Only I'll agree with the camcorder does not change much anyway. Some camcorder within synonymous pixels, to win light, because the ratio changes to the circle of confusion once again.
But I think your statement makes it to the point:
Quote:
need ... you ... to make no head




Antwort von aight8:

achso okei!

So this means that one in a recording with less light the "Depth of Field" not at all more responsible, but there is?

than, for example a Grooss in the city last night. of a mountain from filmed. the city is great. So starts right below s.and reaches very far back. the lights of the city should be uniform everywhere sharp. but because of the open panel, you're gonna get the not out, right?



Antwort von Blackeagle123:

Quote:
So this means that one in a recording with less light the "Depth of Field" not at all more responsible, but there is?


Do you see the background? If not, then the matter is clear!

Otherwise, we wish to be a really shallow depth of field, so a focus background or foreground (as always synonymous). Negative notice will not work.

In addition, you'll see in a small camcorder (because the chip size) a little depth of field difference when you open it and film the Aperture wide angle. A significantly reduced depth of field but you will see when you zoom.
Ahead, have some of ... On the day: Aperture (with ND Filter s.besten that the picture is not too bright), Aperture, then zoom.

Therefore you do not worry about times. ;-)

Best regards,
Constantin



Antwort von mov:

Depths (un) schuarfe is synonymous always dependent on the ratio of the distance between object and background to object to camera. If the object, here the beginning of the city, very far away (depending on the burning as p.5-20m) of the camera, the rearmost part of the city not really blurred. The closer to the Fokuas with s.Unendlich come, the greater the depth of field. Depending on the wide-angle lens, the closer is the limit.



Antwort von The KLF:

Hello!

Times as you read on Wikipedia article on depth of field by. As is explained all good.

Then you can times synonymous for "hyperfocal distance googling", which is the distance, everything is mapped to infinity s.der sharp. Depends of Aperture, Focal and the previously mentioned Z-circles from. The latter one fits s.Sensorgröße and the planned projection size and the intended viewing distance (viewers to the screen / Television) on.

Then you can still synonymous in the net after-DOF computers search, the You is the focal plane (that of what to calculate how far away the sharp picture). You have to feed them but with your camera sensor size, focal length, aperture and Z-circuit size.

The field of depth of field is s.Anfang not quite so simple, but should actually Committed to the basic knowledge of each photographer and video filmmaker are synonymous.

Best regards,
The KLF



Antwort von pilskopf:

http://www.gofred.de/snippets/DOF-Calculator.php

Dof Calculator for example.



Antwort von The KLF:

Here's another DOF Calculator:

http://www.dofmaster.com

In English, but with many controls.
Especially for photographers synonymous Page class, you can create synonymous tables for different focal lengths / aperture combinations.


Best regards,
The KLF



Antwort von WoWu:

Caution .....
The calculator always need the effective focal. As stated with the camcorder but is the equivalent focal length. Is there but one Effektivbrennweite of camcorders .... you can be the result not surprised.
And then the hyperfocal distance is just in time to measure.



Antwort von The KLF:

"WoWu" wrote:
Caution .....
The calculator always need the effective focal. As stated with the camcorder but is the equivalent focal length.


You need the real Focal (you meant with the effective?). Is usually on top of a Lens and should be synonymous to find the technical data.

For example, the zoom lens of my Panasonic SD707 she stands in front s.Lens: 3.45 to 41.4 mm.
This means that in wide Anglesind's 3.45 mm in maximum telephoto position and (= as far as it goes zooming) it is 41.4 mm.
The camera is zooming in the display to zoom in (between 1x and 12x). This number would then be multiplied with the initial focal length of 3.45 and you have just used the Focal (approximately).

And that value must be in the DOF Calculator (link I posted above, next) enter in the Focal. Sensor size (in my case 1 / 4 ") is synonymous in the technical data, whether the order associated Z-circuit size of the DOF calculator for video is a good idea, I have recalculated not yet, the data is indeed for photos. But gefühltermaßen the difference may not be so huge.

OT: I notice now that Panasonic is on the lens with 1:1.5 aperture and boasts the much smaller aperture in normal and telephoto views can just go by the board :-(

Best regards,
The KLF



Antwort von WoWu:

3.45 - 41mm seems to be the real focal to be synonymous.
Common with camcorders were always given the equivalent focal length, which is often on the lens, because actually the visual impression of the lens to compare the interest you want.
conversions When camcorders with 16:9 sensor must be as synonymous again. But the effective focal is yes, simplified, the distance between the optical center of the lens and the focal point.
This depends of the sensor size and moves with camcorders between 3 and 5 mm.
This is the Focal, which determines the DoF and then you will see that the result of the calculation synonymous with the real world is consistent. then that is all of 40cm to infinity is sharp, depending on how the property values fall. (Even at open are for the parts do not really suitable).
DoF is on the tiny chip camcorder really just a theory.



Antwort von iMac27_edmedia:

being in the 707er of Panasonic eighth but too much on the Focus range, with colored edges, you can ensure at least that is what the picture sharp. Many cameramen (gentlemen) found the DoF-impression on the 707 better than many other small VideoCam!



Antwort von Bernd E.:

"WoWu" wrote:
... Common with camcorders were always given the equivalent focal length, which is often on the lens ...

The targeted to the small format equivalent focal length is mentioned in data sheets and manuals on the lenses themselves - no preference whether camcorders or synonymous to the EF-S lenses of Canon for the APS-C DSLRs - but always the actual focal engraved. At least I have not yet encountered these devices, in which it would have been different.



Antwort von 0711video:

"Aight8" wrote:
When it is dark and has no possibility to create more light so it is forced to open the Aperture. But that means at the same time you have a depth of field.

Dan is taken up with retakes always with a DOF, synonymous if you will it aim at all?


when you turn in the total or medium shot, you have area synonymous with cameras großchipigen a large, of the front is sharp to the end.
http://www.slashcam.de/artikel/Basics/Sensorgroessen-of-verschiedenen-Kameras--Camcorde--DSLRs---Film--im-Comparison.html

and when the cameras with their vollamateurbereich streichholzkopfgroßen sensors'll need to take account of sharpness / blur make no thoughts. which are in fact even smaller than the 8-mm-sized sensors with a panasonic dvx 100 or sony s 270 for many thousands of euro.



Antwort von WoWu:

@ IMac27_edmedia
I agree there, especially because the DoF really says nothing at all, but so are all behind.
I find synonymous, that the way such as the uncertainty, much more important than the "quantity" is the focus. Quite apart from the fact that the man synonymous, of course, sees no "great" uncertainty, but only a "slight" blur. The get out probably with difficulty (and knowledge of things) synonymous with a camcorder.
Therefore, it may well be that the 707 stands as a beautiful Picture.

@ Bernd E.
I had meant less synonymous to "sign", as more understanding in the consumer area, which really speaks only of comparative values.
I've never heard someone who said: "I do not really, as my camcorder wide angle. Always .... "Na, 40mm wide angle is not particularly" ... and then such values in the DoF Calculator typing .... can not function naturally.
I was, admittedly, slightly surprised when KLF had the correct values. -Chapeau-




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