With 35mm cameras, a lens with a focal length of 35mm is usually considered to be wide-angle however, in reality, it is no more "wide-angle" than a "normal" 50mm lens is "telephoto" - each of the two is essentially equally proportionally different in opposite directions from true "normal." It is just that the 50mm focal length is close enough and provides a pleasing enough perspective that it was addopted as a de facto standard across the industry. Dusting off my memory of the Pythagorean Theorem (the square of the hypotenuse of a right triangle is equal to the sum of the squares of its other two sides), for full-frame 35mm, that would be a lens with a focal length of 43.27mm, and, for DX format, it would be a lens having a focal length of 28.37mm. It’s focal length is derived from the diagonal of the rectilinear area of its image sensor, be it film (in the case of full-frame 35mm, that would be 24x36mm) or digital (in the case of Nikon DX sensors, it's 15.6x23.7mm). There is no corresponding camera lens that exactly matches what the eye perceives as "normal." However, the so-called "normal" lens come close. More practically, the brain analyzes an area of the overall image corresponding to an ovoid cone approximately 25-to-30 degrees in height and 35-to-45 degrees in width as what one "sees." In full-frame 35mm parlance, that would require a fisheye lens with a focal length of about 6mm however, unlike the camera lens, the human eye, because of the shape of the retina and the processing power of the brain, automatically re-maps the image into rectilinear space. Many say the 50 mm, but the reason for that IMO is that the optical magnification in the viewfinder on a old SLR (with bigger viewfinder) is about the same as "life-size".įirst of all, the human eye: It’s an amazing device capable of discerning motion and limited detail over a horizontal angle in excess of 180 degrees (depending somewhat on the individual). Thats why the perspective of the 85 is so pleasant to the eye. so long ago I dont remember from where, but it make sense to me: We see a very wide angle, but we concentrate on a narrower view, about the same as an 85 mm lens on a 35 mm SLR. I read some posts claiming that a 50mm lens sees beĪbout the same thing as you'd see with the human eye. On top of this: To show the real experience in watching my pictureĪs if you would walk on the street, I need to use a FOV similar to Is the opening in degrees on the human eye? How can I match this two parameters? also, what While in my 3D model I use degrees, that relates to the opening of Overlapping 3D images with the photo, I need to use the same FOVįor both pictures to look real. Now what is the connection with the Nikon forum Talk? Then Of the photo, to get an idea on how the street would look like Later, I photoshop the 3D model of the building on top My D70 to get street photos of the future site of a building we areĭesigning. This is my issue: I work for an architectural firm, and I am using I read some posts claiming that a 50mm lens sees be about the same thing as you'd see with the human eye. On top of this: To show the real experience in watching my picture as if you would walk on the street, I need to use a FOV similar to the human eye. How can I match this two parameters? also, what is the opening in degrees on the human eye? When using the camera, I use mm, while in my 3D model I use degrees, that relates to the opening of the viewing angle. Now what is the connection with the Nikon forum Talk? Then overlapping 3D images with the photo, I need to use the same FOV for both pictures to look real. Later, I photoshop the 3D model of the building on top of the photo, to get an idea on how the street would look like three years from now. This is my issue: I work for an architectural firm, and I am using my D70 to get street photos of the future site of a building we are designing. I am a fresh D70 user now, but haven't published anything here yet.
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