Camera Zoom In Forensic Animation case

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  10 October 2012
Camera Zoom In Forensic Animation case

I am analyzing a light-wave file that was handed over as part of a forensic investigation. I do not use light-wave on a day to day basis.

**I have a camera that is labeled 50mm in the scene, but it has a zoom ration of 6.9.

What does this mean? What should it be set at?

This case deals with a first persons perception of the accident, and I am trying to determine the accuracy of the camera.

In our estimation, the camera does not look correct. (The image looks zoomed.) Nor does the camera reflect what we have found to be an accurate representation of the human eye. Which is 17mm give or take.
  10 October 2012
hi steve

i think by default the lightwave camera should have a zoom factor of around 3.2 with a focal length of around 25mm.

try and it maybe it helps

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  10 October 2012
I take it, there are probably fotos already taken for the case and the rooms or objects or views to be built?

If so, you can use the Camera Properties to match the settings of the Camera in LW to those taken in Real Life.

Select Camera then Properties in Layout.

Then Real Lens Camera
then for the various Camera Factors like Zoom, etc. Use the Drop Down
Select from Image.

Most cameras place the settings in a MetaFile Data with the image, which can be read out.

Also, here is an older link on forensics from LW users. Perhaps write a couple of them for tips.

Wish you luck.
  10 October 2012
What really matters isnt just the lens length... but also the frame height (the x" under Aspect). The best general rule of thumb is this... set the drop down to 35mm SLR, and les lengths>eye work thus...

50mm is the same level of magnification the human eye gives. Look through a real 50mm lens and things stay "the same size"... though obv, you field of view is heavily clipped.

25mm is close to the human field of view (distance between the farthest thing to the right/left hand sides you can see).

Ofc... in individual folk, these numbers differ by 1-2mm based on eyeball size, eye separation, etc... but generally, if its a representation of perspective/perceived size you want 50mm... if its a representation of whole view field, use 25mm.
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  10 October 2012
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