Maxwell Render

Good examples are first person shooters, they're based on our beloved virtual cameras and i know from experience that if you go over ~90° a distortion becomes clearly visible and it starts to feel unnatural. So cameras probably do need such a low fov to come close to the impression of human vision. If you take a look at your eyes' fov you'll recognize that the angle in wich you perceive clear information isn't nearly as big as your memory suggests.

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If you wish to make an apple pie from scratch, you must first invent the universe
-Carl Sagan

True, the actual focus area of the human eye is only 2 degrees.

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"Only the happy can escape the labyrinth, but only those who escape are happy"

Direct tranlation in Spanish seccion, really thanks hdebois :
http://www.maxwellrender.com/forum/view ... 4285#84285

Best Regards

mane162

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Pentium IV 3.0, 2G RAM, ATI radeon 256 MB,3D Studio max7.0, OS: WXPsp2
Pentium IV 2.5, 1G RAM, ATI radeon 128 MB,3D Studio max 7.0, OS: WXPsp2

hdesbois, thanks a lot for making this guide, but I think you should first describe the different definitions such as depth of field and focal length. You mention those in the beginning but not what they are.

What is depth of field? What is focal length?



This is confusing, and why don't you mention focal length?



What effect is that?

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Next Limit Team
Merchant of happiness

You're right. Here are some precisions :

Definitions :

Focal lenght : this is the distance from the center of a lens, in mm, at which parallel rays of light passing through it converge. When this lenght is greater than the diagonal dimension of the film, we speak of long (telephoto) lenses. When it's smaller, the lenses are called short (wide angle) lenses. Images formed through long focal lenght lenses appear magnified compared to naked eye sight, and imaged formed through short lenses appear shrinked. In real life, a lense of a given focal lenght gives a sharp image of far away objects when the distance between the center of the lense and the film equals the focal lenght. To get correctly focused images of nearer objects, the lense needs to be moved closer to the film. This is what setting the focusing distance is.

Depth of Field (DOF). The depth of field is the area where an image can be considered as in focus in front and behind the focusing distance. We speak of small (shallow) DOF when very little else is in focus apart what is exactly at focusing distance. When almost everything is in focus, the DOF is big.
The DOF depends on the magnification and aperture. The magnification is the ratio between the size of the object you are photographying and the size of it's image on the film. As film size is, in most cases, small compared to the objects, the magnification is usually much less than 1. It depends on the relative size of the objects and the film, the distance between camera and objets, and focal lenght of the lens.
The bigger the magnification, the less DOF.
The smaller the aperture, the bigger the DOF.

This may seem complicated, but if you try to visualise the ray paths through the lenses, it's easy to understand.



HD

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LW 9.2 Win XP pro amd64x2 2.2 ghz 4gb ram

Thank you very much for this information .. very good for noobs in photography (like me).

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Lars Bjorstrup
http://www.xlars.dk
Maxwell 2, Max 2012, Win 7 64x, ASUS Rampage III Extreme, Intel Core i7 950 Quadcore 2.8 Ghz, 2 x Gigabyte GTX 280, 24Gb DDR 3 RAM