50mm is suppose to be like our natural vision?

12 years 9 months ago #132065 by Moossmann
Now I don't have a full frame camera so my 50mm is closer to 70mm on a D80 right? But if I had a full frame camera I read that a 50mm lens would be equal to what the human eye see's naturally. How accurate is that?


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12 years 9 months ago #132094 by Henry Peach
Not very. The camera and human vision are very different. You could set your zoom lens to 30ish mm to see what "normal" focal length looks like on an APS-C format camera. I think you'll notice your vision's field of view is much wider. Closer to 30mm on 35mm format or 20mm on APS-C format. A normal focal length lens has a focal length that's close to the diagonal measurement of the sensor or film frame. It does sort of guide you to locate the camera (compose) in a way that tends to provide a perspective that looks natural to the human eye.
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12 years 9 months ago #132098 by Pud
Is that really true, that a 50mm is like our natural vision? I never of that, awesome.


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12 years 9 months ago #132147 by KCook
Not precise at all. In the early days of 35mm film photography most "normal" lenses were 50 or 55 mm. As time went by that creeped to include as short as 38mm and long as 58mm. A fun read on "normal" lenses -

www.dcolegrovephotography.com/photonews/...-focal-lenth-lenses/

Kelly Cook

Canon 50D, Olympus PL2
kellycook.zenfolio.com/

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12 years 9 months ago #132171 by Scotty
It has normal distortion. That's about it.

When the last candle has been blown out
and the last glass of champagne has been drunk
All that you are left with are the memories and the images-David Cooke.

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12 years 9 months ago #132179 by Baydream
If "normal" is looking through a rectangular hole on a wall. :whistle:

Shoot, learn and share. It will make you a better photographer.
fineartamerica.com/profiles/john-g-schickler.html?tab=artwork

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12 years 9 months ago #132265 by Henry Peach

Baydream wrote: If "normal" is looking through a rectangular hole on a wall. :whistle:


:goodpost:

"I've finally figured out what's wrong with photography. It's a one-eyed man looking through a little hole. Now, how much reality can there be in that?" -David Hockney
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12 years 9 months ago - 12 years 9 months ago #132268 by Henry Peach
Notes on the Resolution of the Human Eye
Visual Acuity and Resolving Detail on Prints
How many megapixels equivalent does the eye have?
The Sensitivity of the Human Eye (ISO Equivalent)
The Dynamic Range of the Eye
The Focal Length of the Eye

clarkvision.com/articles/human-eye/index.html


Digital cameras vs the human eye

www.cambridgeincolour.com/tutorials/cameras-vs-human-eye.htm
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12 years 9 months ago - 12 years 9 months ago #132271 by MLKstudios
On a film SLR or full frame DSLR, it considered the "normal" lens, as it matches our own eye's perspective. And yes, we have a wider field of view than it.

The normal is defined by the format. For Canon APS chipped cameras it is close to 30mm and Nikon DX, closer to 35mm (due to the crop differences).

Any lens NOT normal has distortion. Wide angle distortion is compared to looking out a peep hole. It tends to bend the edge lines outward, and makes close things look larger than they would look to us.

Telephoto distortion (known as telephoto compression) is often seen as a positive, as it makes a more pleasing portrait. Due more to how far away we have to shoot to frame a headshot with a telephoto.

The normal focal length equals the diagonal measurement of the format. That's because it takes a circle that size to cover it. Or a 1:1 ratio of the focal length to the image circle required for the format.

Matthew

Matthew L Kees
MLK Studios Photography School
www.MLKstudios.com
[email protected]
"Every artist, was once an amateur"

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12 years 9 months ago #132320 by KCook
Pinhole "lenses" are distortion free, regardless of focal length. See the simpler viewcamera lenses as well.

Distortion is a function of lens design, not focal length. Modern camera lenses are not pinhole devices, instead they use a compound design. Lack of distortion, in a compound lens, is due to the designer carefully setting up the various lens elements to correct for distortion. This is just as true for "normal" focal length lenses as it is for wide angle and telephoto. Here is a shot with a 10mm lens (dial in 1.6x crop factor if you want) with very mild distortion -



Had the designer not cared about distortion, it would have had lots of distortion. The very same thing is true for "normal" lenses. There really isn't anything magic about the normal focal length, except that it happens to be more useful for more people.

Kelly

Canon 50D, Olympus PL2
kellycook.zenfolio.com/

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12 years 9 months ago #132475 by Studio Queen

Henry Peach wrote:

Baydream wrote: If "normal" is looking through a rectangular hole on a wall. :whistle:


:goodpost:

"I've finally figured out what's wrong with photography. It's a one-eyed man looking through a little hole. Now, how much reality can there be in that?" -David Hockney



I've not heard that quote before. It's true! Might I change it to optionally include "It's a one-eye woman looking..." :P


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12 years 9 months ago #132746 by Martin
I have to say, this thread was pretty interesting. I personally thought the 50mm has the most realistic eye to realistic ratio. LOL does that make any sense?


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