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FORUMS News & Rumors Camera Rumors and Predictions
Thread started 06 Jan 2012 (Friday) 08:39
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D800

 
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form
"inadequately equipped"
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Feb 08, 2012 13:19 |  #256

Unlike you, I'm not rich. I have to see what Canon is going to do, if their autofocus is going to be any better with the next camera, or if they really are just going to follow their same disgusting pattern. If the next camera is a let-down, I will be switching as soon as I can afford to.


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jonneymendoza
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Feb 08, 2012 13:22 |  #257

form wrote in post #13849946external link
Unlike you, I'm not rich. I have to see what Canon is going to do, if their autofocus is going to be any better with the next camera, or if they really are just going to follow their same disgusting pattern. If the next camera is a let-down, I will be switching as soon as I can afford to.

+1..


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jdizzle
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Feb 08, 2012 13:22 |  #258

form wrote in post #13849946external link
Unlike you, I'm not rich. I have to see what Canon is going to do, if their autofocus is going to be any better with the next camera, or if they really are just going to follow their same disgusting pattern. If the next camera is a let-down, I will be switching as soon as I can afford to.

I'm not rich at all. I earn it just like everyone else. I guess it makes sense to wait and see what the 5D 3 has to offer. :)




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form
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Feb 08, 2012 13:25 |  #259

Selling your body is not something all of us can do effectively.


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Scott_online
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Feb 08, 2012 13:26 |  #260

An alternative opinion...

http://fakechuckwestfa​ll.wordpress.com/external link


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RhysPhotograph.Me
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Feb 08, 2012 13:28 |  #261
banned

^^^
Noticed that yesterday, although swiftly concluded it as a troll site...


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Scott_online
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Feb 08, 2012 13:41 |  #262

Fake Chuck has been around for ages. It's not a troll site - he's just as hard on Canon.

I happen to think he makes a number of valid points about the D800. If my maths is correct (and it may not be) you'll start to get diffraction softening on the green channel below f/2.8! And what about the fill factor?


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Shadowblade
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Feb 08, 2012 13:48 |  #263

Scott_online wrote in post #13850105external link
Fake Chuck has been around for ages. It's not a troll site - he's just as hard on Canon.

I happen to think he makes a number of valid points about the D800. If my maths is correct (and it may not be) you'll start to get diffraction softening on the green channel below f/2.8! And what about the fill factor?

You'd start to get softening around f/8, not f/2.8.




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jdizzle
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Feb 08, 2012 13:49 |  #264

form wrote in post #13850000external link
Selling your body is not something all of us can do effectively.

Lol! :lol:




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Jahled
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Feb 08, 2012 13:54 |  #265

Scott_online wrote in post #13850002external link
An alternative opinion...

http://fakechuckwestfa​ll.wordpress.com/external link

Hahaha! Doesn't mince his words does he!


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Scott_online
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Feb 08, 2012 14:00 |  #266

Shadowblade wrote in post #13850143external link
You'd start to get softening around f/8, not f/2.8.

I worked it out as the aperture at which the diameter of the Airy disk exceeds the pixel dimensions. For green light that's around f/2.8. How did you get f/8?


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jdizzle
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Feb 08, 2012 14:02 |  #267

Scott_online wrote in post #13850002external link
An alternative opinion...

http://fakechuckwestfa​ll.wordpress.com/external link

I can't believe I wasted my time reading that. :rolleyes:




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Shadowblade
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Feb 08, 2012 14:48 |  #268

Scott_online wrote in post #13850218external link
I worked it out as the aperture at which the diameter of the Airy disk exceeds the pixel dimensions. For green light that's around f/2.8. How did you get f/8?

The diameter of the first ring of the Airy disc is given by the equation:

sin θ = 1.22λ/d, where θ is the angle of the divergent rays after diffraction, λ is the wavelength of light (520nm in the case of green light) and d is the diameter of the aperture.

The D800's photosites are 4.9 microns, or 4900nm across. Therefore, trigonometry gives us, approximately (since θ is small and there won't be much difference between the focal length and the hypotenuse of the focal length and radius of diffraction):

tan θ = 4900/F, where F is the focal length (in microns).

Therefore:

sin θ = 4900/(√(F^2)+(4900^2))

Since θ is small, for ease of calculation, we can approximate this as:

sin θ = 4900/F = (1.22 x 520)/d

F/d = 4900/(1.22 x 520) = 7.72, or an f-stop of f/7.72 as the diffraction limit for a single photosite.

Of course, this is just for one photosite - a pixel takes information from four different photosites, which effectively doubles our acceptable Airy disc diameter to 9.8 microns, giving us an effective diffraction limit of f/15.4.




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Scott_online
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Joined Aug 2009
Feb 08, 2012 15:20 |  #269

Shadowblade wrote in post #13850595external link
The diameter of the first ring of the Airy disc is given by the equation:

sin θ = 1.22λ/d, where θ is the angle of the divergent rays after diffraction, λ is the wavelength of light (520nm in the case of green light) and d is the diameter of the aperture.

The D800's photosites are 4.9 microns, or 4900nm across. Therefore, trigonometry gives us, approximately (since θ is small and there won't be much difference between the focal length and the hypotenuse of the focal length and radius of diffraction):

tan θ = 4900/F, where F is the focal length (in microns).

Therefore:

sin θ = 4900/(√(F^2)+(4900^2))

Since θ is small, for ease of calculation, we can approximate this as:

sin θ = 4900/F = (1.22 x 520)/d

F/d = 4900/(1.22 x 520) = 7.72, or an f-stop of f/7.72 as the diffraction limit for a single photosite.

Of course, this is just for one photosite - a pixel takes information from four different photosites, which effectively doubles our acceptable Airy disc diameter to 9.8 microns, giving us an effective diffraction limit of f/15.4.


OK. Thanks for the explanation.

(I just calculated the diameter of the disc as 2.44 x lambda x N. I used a wavelength of 750nm which I had in my mind as middle green, but having checked it's actually well into the red.)


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Adam ­ Jones
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Feb 08, 2012 16:24 |  #270

jdizzle wrote in post #13850160external link
Lol! :lol:

Glad to know I'm not the only one that saw the comedy there. :cool:


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