Imre --

 

I Have been struggling with some issues with my W1 and perhaps, given the description you gave, you might have the answers.  I realize that this is the anaglyph group, but I use my Fuji W1 to make anaglyphs, so does this count?  ;-)

 

When you speak about convergence and "film shift"  are you talking about what is commonly called "toe-in," the slight angling in of each lens?  Or is there another kind of convergence?  Is this how the W1 also achieves parallax adjustment?  When I adjust the parallaz using the left/right toggles in the middle of the left hand controls on the back of the W1, am I toeing-in the actual lenses or "shifting the film" or is this just an overlap mathematically calculated by the camera? 

 

I also did not understand your comment "The 2D mode has 35 mm focal at the Fuji, but the 3D mode is only 39 mm."  I thought the Fuji had a focal length of 6.3 - 18.9mm.

 

Any clarification you can give me would be very helpful.  I have been taking stereo photos with the W1 against a green screen and then trying to composite them into 3D environments generated using various 3D modeling software, and I am finding it difficult to recreate the 3D environment to match the camera settings used to take the photos.  So any information would be very helpful.

 

I appreciate you contributing to this group using English.  I know it is not your native language, but you do very well with it!

 

Thanks!

 

-- Mark

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From: Imre dr.Zsolnai-Nagy <imrezsolnainagy(-at-)gmail.com>
To: anaglyphs(-at-)yahoogroups.com
Sent: Sat, June 26, 2010 5:05:11 AM
Subject: Re: [Anaglyphs] Some closeup with converged cameras with SDM 003 last

 

Hi Brian!
It is very difficult with my bad English explain all what I want, but I try it.
The camera lenses are centered, the eye lens system is decentered.
See image decentered.jpg
In other words: when our eyes see parallel we have a certain convergence. So the convergence is built-in in your eyes.
See image: decentered01. jpg
The parallel cameras dont have this "built-in" convergence and for this reason we have problems at the edges on our anaglyphs.
If you see:absent.jpg, you will understand that we have constantly need a little of FOV and film. This problem was resolved by the Realist, shifting the film. But I think this isnt enough, because is absent the real convergence ( the "built-in" ).
The big goal made by Fuji W1 is: the Fuji made the real "built-in" convergence and made too the "film-shift" too.
Remember? The 2D mode has 35 mm focal at the Fuji, but the 3D mode is only 39 mm. What it means?
It means that the Fuji has a possibility to shift the film in a certain limits.
Fuji.jpg: see the limit of the fil shif on the left lens, what isnt converged,
On the right lens the Fuji has the "built in" convergence too, and the same possibility of the film shift.
I agree that the convergence isnt the best way because this produces keystone effect, but since the convergence is about 2 degrees, the solution is acceptable.
One of my friends (Antonello Satta)  made the theoretical ideal stereo camera. It is based on "shift lenses".
See: ideal stereocamera. jpg
So the conclusion: if we have 2 cameras the suggestion is this:
Use a convergence of 1-2 degrees ( enough on only one camera ) and use a wide angle lenses, but at the final crop use less image size than the original. ( exactly what done the Fuji )

Imre

2010/6/25 Brian Wallace <Starg82343(-at-)hotmail. com>

Imre,
 
Nice result, but what was the purpose for converging the cameras?  To get closer to the subject?  To reduce deviation?
 
Brian


My Flickr page: http://www.flickr. com/photos/ ur4chun8/ Click on a thumbnail pic, then Click on "+ ALL SIZES" (for larger view) My photos according to "Interestingness" http://fiveprime. org/hivemind/ Tags/Brian, Wallace,3d


 

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To: anaglyphs(-at-)yahoogrou ps.com

From: imrezsolnainagy(-at-) gmail.com
Date: Fri, 25 Jun 2010 20:02:54 +0200
Subject: [Anaglyphs] Some closeup with converged cameras with SDM 003 last

The cameras I converged 2 degrees on 65 mm base...

Imre

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