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Megatalls Discussions of projects under construction at least 600m/2,000 ft tall.



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Old August 14th, 2009, 08:46 AM   #19641
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fantastic picture....amazing...
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Old August 14th, 2009, 11:38 AM   #19642
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Quote:
Originally Posted by paul.c.martens View Post
ORLY?

22mm roughly mimics the human eye.


Huh? 22mm is wide angle. On FF DSLR (Canon 5d, Nikon D700, Sony A900) (or film camera), 50mm mimics the human eye. On APSC sized sensor (Nikon D90, Sony A700, Canon T1i), 33mm will mimic human eye.
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Old August 14th, 2009, 12:10 PM   #19643
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Maybe you mean one eye and paul refers to both eyes?

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Originally Posted by drew.magoo View Post
great shots, diver. lol, is security usually this lenient?
Usually not. But yesterday there was no barrier coming from the Mall, probably for the workers to walk on and off the construction site. So we acted as if we were stupid tourists and just walked up close to BD as far as it seemed legitimate. Walking back to the Mall the security was back and looked a bit irritated.
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Last edited by Desert Diver; August 14th, 2009 at 12:20 PM.
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Old August 14th, 2009, 01:32 PM   #19644
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The effective focal length of a SINGLE eye is 22.3mm.

http://www.clarkvision.com/imagedeta...esolution.html

Quote:
What is the focal length of the eye? I did a google search and found many "answers" ranging from 17mm to 50mm (50 is totally absurd).
Back on topic, WB DD

Friday is usually the best day for sneaking around the Burj as there are very few workers - if any - around, especially early in the morning.
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Old August 14th, 2009, 05:47 PM   #19645
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Great annex cladding almost done too
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Old August 15th, 2009, 12:43 AM   #19646
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I think it will get very boring once the cladding is completely finished... We need pics of the interior!
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Old August 15th, 2009, 12:52 AM   #19647
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great pics!
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Old August 15th, 2009, 01:36 AM   #19648
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Quote:
Originally Posted by Hightech Pro View Post
I think it will get very boring once the cladding is completely finished... We need pics of the interior!
It won't get boring until many 800+ meter towers are constructed worldwide which will take a few decades at least. BD isn't very beautiful but it's sheer height makes it very impressive.
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Old August 15th, 2009, 01:57 AM   #19649
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@dark_shadow1
I was just talking about this thread, not about other towers...
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Old August 15th, 2009, 01:11 PM   #19650
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Quote:
Originally Posted by gerald.d View Post
The effective focal length of a SINGLE eye is 22.3mm.

http://www.clarkvision.com/imagedeta...esolution.html
I will stick with what I said, it's 50mm for human eye. I can post links too

http://www.hash.com/users/jsherwood/...cal/focal.html

50mm. see?I told you. That is, 50mm on FF DSLR .. which would be same as
33mm on APSC.

I have an APSC DSLR right here. 22mm would mean my focal length on APSC would have to be around 15mm .... NO WAY ON EARTH human eye is that wide angle. Also, there is a reason why 50mm (on FF) is called standard. Anything over 50 is telephoto, and anything under it is wide angle. 50mm (on FF) is the standard how human eye will see it.

Edit: More found on the link below. So regardless whether it's 17mm or 22mm, the part that the brain can precieve ends up only around 50mm. The brain cannot precieve the entire image. So my original answer was correct after all. Besides, I didn't have to google anything. I have several cameras and lenses. Anyone who claims that human can see as wide as 22mm (on FF -- which is equal to 15mm APSC) has never ownned a camera or used lenses. That answer is absurd to the limit!

Quote below...

http://www.cambridgeincolour.com/forums/thread106.htm

The image focal length of the human eye is approx. 22 mm, but drawing direct conclusions from this about the angle of view is more problematic because (i) the back of our eyes are curved, (ii) the sensing area (retina) is quite different than a digital camera and (iii) the resolution is not constant throughout (with greatest acuity at the center and gradually less towards the edges), amongst others. Each eye individually has anywhere from ~120-210 degrees angle of view. However, the dual eye overlap region is somewhere around 130 degrees-- corresponding to a a near fisheye lens focal length on a digital camera.

However, for evolutionary reasons the extreme perimeter of our vision is really only for sensing motion and large-scale objects (ie, the lion suddenly approaching you from the side). The central angle of view of say around 40-60 degrees or so is what most impacts our perception of a scene. Subjectively, this would roughly correspond with the angle over which you could recall objects from a scene if you had kept your eyes in the same position. Incidentally, this is pretty close to a 50 mm "normal" focal length lens on a 35 mm camera sensor (43 mm to be precise), or a 27 mm focal length on a camera with a 1.6X crop factor.

Last edited by zurichint; August 15th, 2009 at 01:40 PM.
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Old August 15th, 2009, 02:24 PM   #19651
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Old August 15th, 2009, 02:26 PM   #19652
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Quote:
Originally Posted by zurichint View Post
Besides, I didn't have to google anything. I have several cameras and lenses. Anyone who claims that human can see as wide as 22mm (on FF -- which is equal to 15mm APSC) has never ownned a camera or used lenses.
Thats true. Best way to find that 50mm mimics human eye is to set your lens to 50mm and then with both eyes open look through the viewfinder. You will see with both eyes exactly the same. If you would set 22mm (no mather if its ff or not) its no way you will see the same.
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Old August 15th, 2009, 03:39 PM   #19653
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How much longer will it take before the constriction's completely finished?...I can't wait until the premier opening ceremony of this grand skyscraper!
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Old August 15th, 2009, 04:52 PM   #19654
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20 december 2009
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Old August 15th, 2009, 08:05 PM   #19655
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Help me out here and explain these two statements:
Quote:
Originally Posted by zurichint View Post
I have an APSC DSLR right here. 22mm would mean my focal length on APSC would have to be around 15mm .... NO WAY ON EARTH human eye is that wide angle.

<snip>

Each eye individually has anywhere from ~120-210 degrees angle of view. However, the dual eye overlap region is somewhere around 130 degrees-- corresponding to a a near fisheye lens focal length on a digital camera.
When you're done, I'm more than happy to meet you at the spot where I took those photos.

I'll bring my camera, a selection of lenses ranging from 12mm right up to 800mm, a plumb line, my eyes, and a pencil and paper to do some basic trig.

You bring whatever you want.
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Old August 15th, 2009, 08:09 PM   #19656
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Quote:
Originally Posted by patrykus View Post
Thats true. Best way to find that 50mm mimics human eye is to set your lens to 50mm and then with both eyes open look through the viewfinder. You will see with both eyes exactly the same. If you would set 22mm (no mather if its ff or not) its no way you will see the same.
Try driving whilst looking through a camera with a 50mm lens mounted on it.
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Old August 15th, 2009, 08:15 PM   #19657
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wtf ??
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Old August 15th, 2009, 09:25 PM   #19658
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Quote:
Originally Posted by gerald.d View Post
Try driving whilst looking through a camera with a 50mm lens mounted on it.
Stop arguing the losing battle. See the link I posted above. ( http://www.cambridgeincolour.com/forums/thread106.htm )

50mm (or 42mm to be more precice) is the right answer, since human brain can precieve/comprehend only the small portion of the image that it sees. Also, this is on FF. What camera do you use?
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Old August 15th, 2009, 09:53 PM   #19659
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Quote:
Wow, Impressive!
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Old August 15th, 2009, 09:56 PM   #19660
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Quote:
Originally Posted by patrykus View Post
wtf ??
What I'm saying is, if you want to find out quite how closely a 50mm lens mimics the field of vision of a human eye, try carrying out a few simple tasks whilst experiencing the field of view that a 50mm lens gives you (40 degrees horizontal on a FF 35mm camera).

And see how long you last.

To Mr "zurichint", what's bizarre is not that you're attempting to support your argument by linking to posts on internet forums, but that you are attempting to support your argument by linking to posts on internet forums that actually disagree with what you are claiming.

The bottom line is this.

If you were to stand on the spot I was standing when taking those photos, and the scene, through your own eyes, looks like this:



then I'll gladly pay for your optometrist check-up myself.
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