I just saw this image and I think it illustrates well the effect seen when the sensors are parallel or not: (before correction) JackDesBwa

#alignment #capturing #howto

STMANI3 finds the perspective transformations that minimize the vertical disparity. It is a successive approximation method that needs to start with an assumption for the perspective parameters. By de

#alignment #capturing #howto

As Étienne said, the optimal transformation (perspective correction, that is with trapeze deformation) is slightly complex and hard to do by hand. However, it can be easily modeled with matrix operati

#alignment #capturing #howto

I'm not sure of what you mean with "shift and skew", but perspective deformations (keystones) you get when cameras are not well parallel are not simply translations, rotations, nor simple vertical or

#alignment #capturing #howto

I appreciate all the detailed discussion here. Many of mine are shot with two sequential images, one camera, with just an approximate inter-ocular distance horizontal shift. There will always be some

#alignment #capturing #howto

The discussion over how to create stereoscopic pairs the provide comfortable viewing really resolves to “It depends”. Your eyes are very adaptive instruments. Take the case of someone with severe asti

#alignment #capturing #howto

Convergence in shooting leads to vertical disparity in the corners of the image, and to a bad représentation of the distance scale. Best regards, Olivier

#alignment #capturing #howto

To converge or not? For stereo viewing the answer is clearly NOT. The pair of images seen by the human MUST be equivalent to the ones taken by a pair of cameras perfectly parallel, and with the sensor

#alignment #capturing #howto

The question has a slightly different answer now then it had in film days. For geometric correctness, lenses should be parallel. This means that - should you photograph a brick wall, there will be no

#alignment #capturing #howto

To converge or not? As Bob Aldridge said, in close-up photography you might have to converge, in order to maintain any overlap between the R and L views (if you do not converge, the right camera can s

#alignment #capturing #howto

Hummm... I realize that my demonstration is wrong, because my diagram was not rotated in the good way. Forget it. JackDesBwa explanations are much more pertinent than mine.

#alignment #capturing #howto

In short: none. The ideal way is to use shift lenses, but it is expansive unless you shoot inside a 3D modeling software. Parallel and toed configurations are ways to approximate this ideal one, with

#alignment #capturing #howto

Remark: I agree that, with my diagram, a 6 cm distance to your screen is a bit short. I should have adapted a bit more. But, the idea is here. :D

#alignment #capturing #howto

This diagram is also an occasion to explain the 1/30 cooking rule. Suppose you are shooting a mountain, the diagram is like this (and it's easy to understand the contrary if you are shooting a bee), w

#alignment #capturing #howto

When you are shooting with cameras aligned perfectly parallel, the image is a circular scan of the field of view. When viewed at screen, this circular scan is perfectly restored on your screen, and yo

#alignment #capturing #howto

You are right about toeing in causing difficult in viewing different distances. And it is a subject that has been debated for many years. A Stereoscopic Society Bulletin from 1964 has an article on th

#alignment #capturing #howto

Ah, yes. The age old question -- to converge or not converge. I'll stand back and let the folks who have strong technical and philosophical arguments for and against argue the fine points. For general

#alignment #capturing #howto

I have used two methods of camera positioning for the stereo images. One is to choose a focal point and point the camera straight at that point for each of the two images (camera moves on a radius aro

#alignment #capturing #howto

That Oskar 2 is the one Todd made for me - I asked him to make the knobs blue and red as a nod to anaglyph stereo. Fantastic camera! I have taken it on many vacations. I also use Clint Conners 3D prin

#3d-cameras #capturing

This one looks really interesting! I like the shutter mechanism a lot. I have no experience with 3D printing so far, but I guess this is the future. As an architect I am used to a more classic way: dr

#3d-cameras #capturing