maximising depth of field? limit of dslrs for video - Page 2 at DVinfo.net

Go Back   DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic LUMIX G / GF / GH / GX Series

Panasonic LUMIX G / GF / GH / GX Series
4K and AVCHD on a Micro Four Thirds system camera with interchangeable lenses.


Reply
 
Thread Tools Search this Thread
Old December 30th, 2012, 02:12 PM   #16
Major Player
 
Join Date: Jan 2010
Location: Orlando, FL
Posts: 623
Re: maximising depth of field? limit of dslrs for video

The guy has plenty of knowledge and experience to draw from. Check out his website and watch his vids. This isn't some knucklehead with a Sony Handycam spouting off.
Patrick Janka is offline   Reply With Quote
Old December 30th, 2012, 04:41 PM   #17
Regular Crew
 
Join Date: May 2009
Location: Minneapolis MN
Posts: 40
Re: maximising depth of field? limit of dslrs for video

Quote:
Originally Posted by Jim Giberti View Post
I didn't watch the tute but if that's what it says then it's not accurate.
Quote:
Originally Posted by Bruce Foreman View Post
Because we have "everybody and his brother" making "tutorials" whether or not they have the knowledge/experience to draw from.
You may want to watch it before discrediting the information that you think may be in it from second hand hearsay. The information in the video is accurate. The statement "Sensor size does not change the DOF" is also accurate.
If you watch the video he explains as I have that all else staying the same, it only changes the FRAMING(or Crop). You are correct though that to achieve the same DOF with the same FRAMING would be more of a challenge with a smaller sensor due to the changes needed in lens focal length/aperture. Changing the distance can also compensate, but then you are changing the perspective, which would not reproduce an identical image.

What would be the solution to all this? An converter/adapter that fits between the lens and the body (similar to the teleconverters that are available) that optically compensates for the crop size of the sensor, adjusting the image circle of the lens to fall on the sensor in the same proportions as the original comparative example. This would also have the positive effect of an increase in light density equal to the factor of the converter.
Example, GH2 with 50mm FD mount lens and M4/3 adapter, 2x crop sensor. Create a micro 4/3 adapter with optics inside that would make it a .5x converter, Now you have the same framing as a full frame sensor because you are using the full image circle of the lens instead of only the center half, and you have also gained a stop of light (2x factor increase in light).
From what I remember reading, this is very possible, but was patented by a company (Kodak I believe) and therefore Panasonic/Olympus or third party manufacturers are blocked from producing it.
Jeremy Dallek is offline   Reply With Quote
Old December 30th, 2012, 05:06 PM   #18
Major Player
 
Join Date: Aug 2002
Location: Bethel, VT
Posts: 824
Re: maximising depth of field? limit of dslrs for video

Quote:
Originally Posted by Patrick Janka View Post
The guy has plenty of knowledge and experience to draw from. Check out his website and watch his vids. This isn't some knucklehead with a Sony Handycam spouting off.
I would never call him names. I just said that claiming that sensor size doesn't impact DOF is inaccurate, and stated why in my experience. Lot's of things, foreground background proximity, iris, focal length and yes sensor size all directly impact DOF.

It's just physics, not a debate. Like I said, I didn't have time to watch the tute but here's the simple point. In order to get anything close to shallow DOF on say an "old school" DV camera like the XL1 or XL2 you would need to shoot very long - 300, 400mm or more, and have your foreground and background very separated.

Even then, in all but the largest interiors it just won't work practically. In other words, in the only sense that matters - practical production, the smaller the sensor, as we shoot them, the more difficult it is to get shallow DOF with a common lens in a common setup.

So while theoretically he may make sense, practically, if there were no difference, there never would have been Letus and P&S Mini 35s, and the 5D revolution wouldn't have meant what it did.

That's my opinion with no ill will toward the OP or person who made the tute.

Last edited by Jim Giberti; December 30th, 2012 at 06:10 PM. Reason: grammar
Jim Giberti is offline   Reply With Quote
Old December 30th, 2012, 06:24 PM   #19
Inner Circle
 
Join Date: Dec 2005
Location: New York City
Posts: 2,615
Re: maximising depth of field? limit of dslrs for video

All I can do to add to this interesting discussion is that on the GH3 (and probably on the GH2), there is no functional difference in DOF between shooting HD, shooting EX. Tele or shooting a full frame still with the same lens.
Attached Thumbnails
maximising depth of field? limit of dslrs for video-dof-sensor-test.jpg  
__________________
William Hohauser - New York City
Edit/Camera/DCP production/Animation
William Hohauser 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 > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic LUMIX G / GF / GH / GX Series

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 04:08 PM.


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