CCD Size DOF Diagram at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Open DV Discussion
For topics which don't fit into any of the other categories.


Reply
 
Thread Tools Search this Thread
Old October 24th, 2003, 09:35 PM   #1
Regular Crew
 
Join Date: Oct 2003
Location: San Diego, CA USA
Posts: 163
CCD Size DOF Diagram

I know a larger CCD size (focal plane) means it is easier to get a shallower Depth-of-Field. Plenty of threads have stated this already. However, is there a diagram that can illustrate the reason?

I don't feel that I can learn about the subject by memorizing the facts. A picture of a diagram would really help. I would really appreciate it if any of you can send me a link to a diagram or simply let me know where I can see one. (I thought I had seen it once in Jon Faur's DVCAM book)

I apologize if I am upsetting any of you with my dumb question.
Jason Chang is offline   Reply With Quote
Old October 24th, 2003, 11:22 PM   #2
Barry Wan Kenobi
 
Join Date: Jul 2003
Location: North Carolina
Posts: 3,863
Get the angle-of-view-equivalency charts here:
http://www.edward.grabczewski.btinte...ine_Charts.htm

Imaging size doesn't affect DOF, but lens focal length does, and smaller imagers need wider-angle lenses in order to achieve usable fields of view.

Which is why a 35mm movie camera might have a 25-250mm zoom, whereas a 1/6" CCD camera would have a 2.8-28mm lens. The field of view is roughly the same, but the focal length is obviously dramatically different, and the long telephoto of the 35mm camera shows why it would have such shallow depth of field.
Barry Green is offline   Reply With Quote
Old October 25th, 2003, 10:53 AM   #3
Regular Crew
 
Join Date: Oct 2003
Location: San Diego, CA USA
Posts: 163
CCD Size - Focal Length

Thank you for taking the time to try to teach me about this subject.

My follow-up question is: How does CCD size (or Film size) affect focal length?

Here is a link I've found which contains an illustration and formulas. Can any of you explain to me in simple terms just how CCD size affects focal-length based on this illustration?

http://www.dof.pcraft.com/dof.cgi
Jason Chang is offline   Reply With Quote
Old October 25th, 2003, 06:17 PM   #4
Warden
 
Join Date: Mar 2002
Location: Clearwater, FL
Posts: 8,267
The size of the format (i.e. 35mm film, 2/3chip, 1/3 chip etc.) will effect the DOF. Why? The Circle of Confusion (COC) will change with the size format. DOF is also effected when the subject distance is close to the Hyperfocal Distance and at very close distance.

There is not really a visual diagram that fits with DOF. It is a mathematical formula. I don't think a single diagram will help much. Have you read the article and thread on DOF? Now would be a good time and if you have questions post back in the DOF thread. I'll probably add this post to that thread.
__________________
Jeff Donald
Carpe Diem




Search DVinfo.net for quick answers | Where to Buy? From the best in the business: DVinfo.net sponsors
Jeff Donald is offline   Reply With Quote
Old October 25th, 2003, 06:39 PM   #5
Outer Circle
 
Join Date: May 2002
Location: Hope, BC
Posts: 7,527
Okay, Jeff. I got the point. :)
Okay, Jeff. I got the point. :)
Frank Granovski is offline   Reply With Quote
Old October 25th, 2003, 06:53 PM   #6
Warden
 
Join Date: Mar 2002
Location: Clearwater, FL
Posts: 8,267
Frank, those are lines of confusion, not circles of confusion.
__________________
Jeff Donald
Carpe Diem




Search DVinfo.net for quick answers | Where to Buy? From the best in the business: DVinfo.net sponsors
Jeff Donald is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 07:27 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network