Frage von Winel:
Hi,
as synonymous probably some others here, I am interested very much for the depth of HD cameras. I would but first Page of the theoretical approach and understand the mathematics behind it.
For the definition of the DOF seems to be necessary the following:
- Aperture number
- Blur circle
- Focal
- Object Distance
The aperture number must be so small as to be able to minimum depth to achieve the blur circle is (if I understand correctly from a few pages to read, the size of a pixel on the chip.
Let us assume that we have two different cameras to determine the DOF (eg SonyHC3 & Canon HV10 for the same distance to the object and record the same image). The Sonyhat a chip size of 1 / 3 "and a minimum aperture of 1.6. The Canon, however, a chip size of 1 / 2, 7" and a minimum aperture of 1.8.
So when Sonydie Aperture and better in the Canon of the chip.
How do I calculate now the area where the picture is sharp? Can one of you times with a sample invoice durchexerzieren? That would certainly synonymous help other people here that have a low depth of want.
That would be really nice. I'm apparently too stupid. :-)
Winel
Antwort von Cocoa_Magazin:
Ultimately, it is very synonymous to the utilization of the chip size and the fact adapted to Objetive. You can really only safely in the practice test. Unfortunately, the differences are between 1 / 4, 1 / 3 or synonymous still 1 / 2 is quite small. A good example is here synonymous with Full photo cameras (Canon 1Ds) and APSC size (Canon 400). Despite differences in size and fairly adjusted Objetiven is the PRACTICAL difference in the Tiefenschäfte quite low.
Real Tiefenunschäfe get my opinion, only with 2/3-Chips and corresponding Objetiven.
You have to look at the synonymous relationships in mind:
The Canon XHA1 corresponds to a 650mm telephoto focal of actual 90mm at KB. Look so times by a KB-camera, take on 90mm Aperture 3.5 and snippets according to the small part that reads the chip camcorder. You'll find the same Tiefenschäfe. I've tried it. PERSONALLY, I conclude that the only influence on the focal Tiefenschäfe notes.
Antwort von Bernd E.:
To calculate the depth of focus (but for the photo field with larger sensor or film size), there is a handy online calculator:
www.dofmaster.com / dofjs.html
Gruß Bernd E.
Antwort von Cocoa_Magazin:
Here, even better: http://www.rene-grothmann.de/Fotografie/DOF.html
Antwort von Winel:
Hi,
Calculator rich without this additional knowledge not enough, right?
Canon HV10 Example:
Aperture (smallest): 1.8
Set Distance: 3 meters (or else)
Acceptable in small blur in mm:? (How big is a pixel in mm with a 1 / 2, 7 "(or 1 / 3", 1 / 4 ", 2 / 3", etc.) 16 / 9 sensor? Only Pythagoras ranges because I believe not, because the not the real size of the sensor area represents.)
Focal length factor:? (How do I?)
Small focal in mm:? (For comparability we should know what focal lengths of two cameras must be set to the same field of view to obtain. Evtl. Is the adjustable focal synonymous of the chip size, or I'm on the wrong?).
Well what did I read correctly or not savvy?
Winel
