[lbbwing]

例 :
F2.8 - F5.0

是什麼意思呢? 數值越大 / 小 代表什麼? 對相片又有什麼影響?

[Philippe]

這代表在最廣角及最望遠的最大光圈值.以上例子即最廣角可開大至f2.8,但zoom到最遠的話只可以最多開到f5.0.數值越細代表入光量越多.可用較快快門去獲得相同入光量.
同時較細光圈值景深較淺.背景會較化開.大光圈值則前後都咁清楚

[onon359]

同時較細光圈值景深較淺.背景會較化開.大光圈值則前後都咁清楚>>>>>>> 剛?掉轉!!大光圈景深較淺,細光圈值則前後都咁清楚先?!!

[Philippe]

哦,我只是驚誤會所以講光圈值,點知搞到更加多誤會,唔好意思.
應該係數值越細,光圈越大,背景會越化開.

[wklouis]

光圈有如眼晴的瞳孔, 大小來控制光進入的多少.
光圈值越大(數字越細), 同時間進入的光會比較多,
同一快門值的相片在大光圈雙對會比較光.

[Wade]

Notice: 光圈數值係倒數離ka~
---------------------------------------
| 光圈大小 = 1 / 光圈數值 |
---------------------------------------
e.g. F2.8 - F5.0
=> 1/2.8 - 1/5.0
so, F2.8係大光圈個 F5.0 ka~

[fcd10cr]

APERTURE RADIUS=FOOCAL LENGTH/F NUMBER
EXAMPLE 300MM F8.0
APERTURE RADIUS=300/8=37.5mm
THE PHONTON(QUANTITY OF LIGHT) enter proportional to square of it radius

[lbbwing]

明白...解釋得非常詳盡
謝謝各位

[rrrr]

In fact, other than making the Depth of Field, the aperture means so mucn in DSLR camera now? Since the ISO for DSLR can be up to 1600, so seems the bigger aperture is not that important as SLR. For SLR, since it is restricted by the ISO of the film, so the big aperture is important. Not sure if I am right!

[Philippe]

雖然話DSLR可以去到iso 1600,有啲甚至可以去到iso 6400.但係始終係有雜訊.我會話DSLR的iso 400約等於DC的ISO 100.用到iso 1600就會好似DC用iso 400咁,並不是很理想的.所以大光圈還是有好處的.

[yuwailun]

請教,你話DSLR的iso 400約等於DC的ISO 100. 如何証明 ? (是否指100度菲林)

[Philippe]

唔好意思,證明我就真係攞唔出喇,這是跟據我用相機的經驗作判斷,好主觀的.
我係指我覺得DSLR的iso 400的雜訊量約等於DC iso 100的雜訊量.

[man1492]

"請教,你話DSLR的iso 400約等於DC的ISO 100. 如何証明 ?"

If you've got both, you can prove it.
DLSR @ ISO400 ~= DC@ISO100 or even lower.

From my experience, 350D@ISO400 gives less noise than S50@ISO50,
since the S50 has biased ISO speed value (i.e. ISO50 = standard ISO100), therefore the noise level of ISO400 on DLSR is equilvalent to that of ISO100 on consumer DC.

[yoyobobo]

我是初哥好想學多一些:
請問各高手:

可稱為「曝光鎖定) 是否指鎖定最先要曝光位置，後再可移動構圖,那整張相片都是正常曝光,那對相片有什麼分別呢?請多講些
而(對焦鎖定)又有什麼用對 (構圖)