3D Set up at DVinfo.net

Go Back   DV Info Net > Special Interest Areas > 3D Stereoscopic Production & Delivery

3D Stereoscopic Production & Delivery
Discuss 3D (stereoscopic video) acquisition, post and delivery.


Reply
 
Thread Tools Search this Thread
Old June 21st, 2011, 07:58 AM   #1
Major Player
 
Join Date: May 2008
Location: Canada
Posts: 371
3D Set up

I am looking to get into 3D set up using DSLR cameras. I could be wrong but I have seen people put 5Ds side by side on a slider that has two brackets.

Anyone can help me out on finding these DIY sliders or something else that allows me to lock the tripod in one position

Thanks


Jawad
__________________
Jawad Mir / Cinematographer . Filmmaker
Film Style Weddings http://www.filmstyleweddings.com Jawad Mir http://www.jawadmir.com
Jawad Mir is offline   Reply With Quote
Old June 21st, 2011, 11:03 AM   #2
Inner Circle
 
Join Date: Feb 2004
Location: switzerland
Posts: 2,131
Re: 3D Set up

All the problem rely in the distance between the two lenses (interocular distance).

The more you get the more the stereoscopic you get, but also the farthest you need to keep the subject from the camera.

So probably if you want to use 2 DSLR with a workable distance, you will need make them closer as the body allows.

There are several ways to mount the lens closer, all of them will use at least a mirror (surface mirror)

The easiest way is to mount one camera looking straight to the subject and add a 45degree mirror looking on the side.
Giroud Francois is offline   Reply With Quote
Old June 21st, 2011, 11:11 AM   #3
Obstreperous Rex
 
Join Date: Jan 2001
Location: San Marcos, TX
Posts: 26,900
Images: 513
Re: 3D Set up

Quote:
Originally Posted by Giroud Francois View Post
the distance between the two lenses (interocular distance).
The distance between the two lenses is the interaxial distance.

Interocular is the distance between two eyes, which is not the same thing as the distance between two camera lenses.
__________________
CH

Search DV Info Net | DV Info Net Sponsors | A Decade (+5) of DVi | ...Tuesday is Soylent Green Day!
Chris Hurd is offline   Reply With Quote
Old June 23rd, 2011, 03:20 PM   #4
Inner Circle
 
Join Date: Feb 2004
Location: switzerland
Posts: 2,131
Re: 3D Set up

yes, but for big screen you better to make sure you do not end up with a distance between the 2 pictures bigger than the interocular distance (about 65mm, or your eyes will need to diverge to accomodate both picture)
So making sure your interaxial distance is at least smaller than the interocular is a safe way, or you will ned to converge your lenses.
big interaxial is ok as long you limit the viewing on samll screens
Giroud Francois is offline   Reply With Quote
Old June 24th, 2011, 10:07 AM   #5
Wrangler
 
Join Date: Aug 2005
Location: Toronto, ON, Canada
Posts: 3,637
Re: 3D Set up

Quote:
Originally Posted by Giroud Francois View Post
yes, but for big screen you better to make sure you do not end up with a distance between the 2 pictures bigger than the interocular distance (about 65mm, or your eyes will need to diverge to accomodate both picture)
True. The is the maximum positive parallax for the display width. Our brains can accommodate slight divergence, but the angle of divergence is worse the closer you sit to the screen. Therefore, as you stated, you shouldn't exceed the human interocular for on-screen positive parallax.
Quote:
Originally Posted by Giroud Francois View Post
So making sure your interaxial distance is at least smaller than the interocular is a safe way, or you will ned to converge your lenses.
big interaxial is ok as long you limit the viewing on samll screens
It is safer to use smaller interaxials as a general guideline but the interaxial never directly relates to the projected positive parallax separation. There are many more factors involved like real-world depth bracket, desired depth budget (aka parallax budget), convergence point and focal length. Smaller interaxial distances capture less "depth" in the scene so it is easier to fit within a depth budget and manipulate the convergence in post.

However, there is a scenario where the opposite logic is true. Most of the IMAX 3D films were shot with the Soledo camera which has an interaxial close to the human interocular. This created a lot of depth but the convergence was usually set at or near infinity (no divergence in positive parallax) and the screen was so big with a 70 to 90 degree angle of view (depending on where you sat in the IMAX theatre) that stereo window violations were not a concern. Those IMAX 3D films look great on the gigantic IMAX screen, even though there is some miniaturization effect. The problem that you will notice when these films are converted to Blu-Ray 3D for the small screen is that we now have to deal with a very visible stereo window and depth budgets that are usually too deep to simply converge on the closest object and still be within positive parallax limits.
__________________
Tim Dashwood
Tim Dashwood 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 > Special Interest Areas > 3D Stereoscopic Production & Delivery

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:05 AM.


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