EX1 vs SI-2K vs upcoming Scarlet S35 - Page 2 at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Sony XDCAM EX Pro Handhelds
Sony PMW-300, PXW-X200, PXW-X180 (back to EX3 & EX1) recording to SxS flash memory.

Thread Tools Search this Thread
Old January 23rd, 2009, 07:35 AM   #16
Regular Crew
Join Date: Oct 2006
Location: Surrey
Posts: 77
Originally Posted by David C. Williams View Post
If you move back and zoom in to the same framing of the objective, you dof does not change. What it does is it narrows the field of view behind the objective, expanding a section of the original background view to fill the entire background in the zoomed view. The dof has not changed, but the lack of focus detail which was always present in the original view is magnified and becomes more apparent.

Opening the iris will decrease dof. Zooming will decrease dof, but if you also move the camera back, and zoom to the same objective framing, you end up with the same dof.

This is sort of true. nothing in the image will be more blurred by moving back and zooming in, the background blurry bits will just be larger. It's also strictly speaking incorrect because any element behind the point of focus, where the amount of blur was just below the resolving ability of the viewer will be enlarged (assuming the subject at the point of focus is sized identically in the frame) and then the blur will be just perceivable and as such the depth of field will be reduced. However I think we are both being a bit pedantic (I know I am). I suspect in this case what is being asked about is the "look" or "appearance" of shallower depth of field and that can be achieved by moving back and zooming to change the perspective of the scene.

Martin Drew is offline   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

Omega Broadcast
(512) 251-7778
Austin, TX

(973) 335-4460
Mountain Lakes, NJ

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

(800) 238-8480
Glendale, 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 > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 04:58 AM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2015 The Digital Video Information Network