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PostPosted: Sat Dec 01, 2007 3:20 pm 
how many megapixels are human eyes?
how many zoom are human eyes?
color count?

thanks


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PostPosted: Sat Dec 01, 2007 3:26 pm 
I know that the human eye is supposed to have an 35mm equivalent focal length of 50mm, that's why 50mm lenses are referred to as "normal".

This might answer some of your questions.

Edited to say 35mm equivalent.


Last edited by grahamnp on Sat Dec 01, 2007 3:52 pm, edited 1 time in total.

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PostPosted: Sat Dec 01, 2007 3:47 pm 
That's actually for 50mm on a full frame camera (such as Nikon's D3 or Canon's 1D MkIII or indeed a classic film camera). For the rest of us (Nikon's D40, D80, etc or Canon's 400D, 40D, etc) a 35mm will more closely resemble the angle of view of the human eye. :)


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PostPosted: Sun Dec 02, 2007 3:40 pm 
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I somewhat disagree...science be damned!

I can see a pretty wide field of view incl peripheral vision, so I don't see how 35mm on APS-C (1.6/1.5 w/e) or 50mm on FF equates to the human eye.

And I still haven't seen a number that we can equate to pixels.

I doubt its even as high as 10Mp, just that the pixels are able to gather more light and do so more accurately thats why things appear sharper.

Bio-Sensors, massive dynamic range, perfect sharpness and exposure, noiseless high ISO settings - Gimmeh now!

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PostPosted: Sun Dec 02, 2007 4:07 pm 
When they say that the human eye is equivalent to 50mm a 35mm camera, they do not count peripheral vision.

Humans eyes have a lens(the lens) an aperture(the iris)and a sensor(the retina). I just wish we had zoom!


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PostPosted: Sun Dec 02, 2007 7:21 pm 
grahamnp wrote:
I just wish we had zoom!


ofcourse we have zoom


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PostPosted: Sun Dec 02, 2007 10:06 pm 
grahamnp wrote:
I just wish we had zoom!


We do! It's called legs :)


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PostPosted: Mon Dec 03, 2007 12:09 am 
Welly wrote:
grahamnp wrote:
I just wish we had zoom!


We do! It's called legs :)


Haha! Not quite what I had in mind, but yea I suppose it works. :lol:


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PostPosted: Thu Dec 20, 2007 10:05 am 
A human eye sounds like a great replacement for my 70-300mm AF-G :D

Just need an F-mount version....




Chris


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PostPosted: Wed Dec 26, 2007 8:27 pm 
One of the most marvelous things about the human eye is the dynamic range of light that we can see. Everything is perfectly exposed all the time, well almost all the time. For example: when you walk out of a movie theater in day time, we get some serious blow out). Eyes focus REALLY FAST, and are really quiet. A Zoom feature would be cool, but I would probably fall over. try walking with binoculars!


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PostPosted: Wed Dec 26, 2007 8:35 pm 
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Oddly enough this question was answered during, if memory serves, this year's Royal Institution annual Christmas Lectures. The answer is around 100 megapixels. Of course visual acuity isn't uniformly distributed and some receptors do colour while others don't. The Mark I eyeball is, for most of us if we are lucky, a pretty amazing thing coupled to an even more amazing post-processor. 8)

Bob.

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PostPosted: Wed Jan 02, 2008 4:54 pm 
mimium focusing distance = 10cm?????


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PostPosted: Wed Jan 02, 2008 5:11 pm 
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darragh wrote:
mimium focusing distance = 10cm?????

but increases as you get older. :lol:

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PostPosted: Wed Jan 02, 2008 6:07 pm 
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I'll need extension tubes soon then -_-

rofl

100MP Finally a figure i can work with. Large Format plates can do (in digital terms when scanned in at maximum quality) around 100MP apparently - Read it somwhere on the net regarding the Megapixel Myth.

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PostPosted: Sat Jan 05, 2008 7:23 am 
It's an interesting discussion and the math going into it is extensive.

However, and keeping in tune with the camera-analogy, this is only about the lens.

The eyes do not "see" anything - the brain does. It's a trained behavior based on the brain's interpretation of electrical signals. No actual visuals are passed to the brain - only electricity.

The eyes are analog instruments, not digital, and only in a very abstract sense does it make sense to talk about resolution.

But sticking with the analogy, visual resolution should then be defined as the brain's ability to make a distinction between two almost similar electrical signals. The resolution is: how much of a difference can exist before the brain picks it up.

And that doesn't even begin to tap into the discussion about the brain's ability to "fill in the blanks". Every eye has a blind spot, but we don't see it, because the brain perform a photoshop-like "clone stamp" function without us even noticing.

In truth, I think there are way too many variables to come to a full and meaningful conclusion, since we don't understand the brain nearly well enough yet.

....of course that shouldn't stop us from trying :-)


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