[Doi.Doi.]

其實有冇人知人眼的spec為何?

ISO value (sensitivity) ?
焦距 (Focal Length) range?
光圈 (Aperture) ?
Sensor size?
有效像素 ?!

人眼可以在行暗的地方也可以看見. 為何camera, DV 機很難做到.

[royl]

As far as I could remember:

focal length around 50mm
sensor size apprximately half of your eye ball's surface area
ISO....I am quite sure it's higher than 3200 or even 6400

but it's just a guess.

[文迪達]

人同機器邊有得咁講~~

[LEGOWU]

ISO value (sensitivity) ?
<50
唔係你點分到50,100像素o既分別呀

焦距 (Focal Length) range?
約50mm

光圈 (Aperture) ?
o者係瞳孔o者
一樣收細放大

Sensor size?
視網膜

有效像素 ?!
我諗用菲林對比會比較合適
1秒過片約10張(你硬要這樣想的話)
不過人眼光敏度比菲林高
所以人眼可以在微光中看得見
黑暗應當是沒有可能吧...

以上全是靠估...

[小小生]

我只係知人眼對光暗的宽容度有12級左右
彩色正片是3級,彩色負片是4-5級

[micromax]

人同機器怎可以這樣比, 雖然CCD或菲林沒有眼睛的高寛容度及感光度, 但人眼的景深超深, 相機鏡頭可以拍出淺景深是人眼做不到. 微距鏡可以拍出微距世界來, 但若單靠人眼是看不到微距世界的. 打鳥若沒有長焦距鏡頭, 人眼是根本沒有機會走近!

不過相機是不斷向人眼的寛容度及感光度努力中, 也許將來可以更接近! 希望有幸今生可以看到及擁有一部!

[micros]

135 機O既 50mm?
唔好迷信人眼視覺等同 「標準鏡」﹐其實差好遠下﹐自己拎部機瞄下就知。

[luckyben]

micromax:
你話人眼做唔到淺景深我唔係好同意, 你試下將隻手指放係眼前10cm, 你會發現好勁既淺景深效果, 如果你試唔到.......一係你有問題一係我有問題....

[Walton]

人眼的"光圈"是等於相機的 f/1.0 !!!!

[Walton]

有本書話是大約十億萬像.
1000000000.0MP??

[yzcat]

interesting link
http://clarkvision.com/imagedetail/eye-resolution.html

[Walton]

唉....我全錯了...

[fcd10cr]

最重要係人眼用圓形菲林
相機用平面,所以人眼睇野唔會變形

[老叟]

人眼除左可以自動對焦,曝光,矯型之外,仲有自動矯色,不過麻鷹仲利厲,可以廿倍遠攝變焦,怕未??

[Rol]

ISO of human eye must be much much higher than ISO3200 , because human can see the star in sky, the limit of human eye can see the star with grade 7 brightness (grade 1 is more bright, grade 10 or higher grade is less bright)

But if you use DC with 50 mm len (same focal of human eye) to shoot the star, even the DC expose the shutter for few minuate, the DC won't catch the star with grade 4 or 5