[ottawamichael]

各位師兄請教教小弟..用緊7D + 小小白
如果影賽車,應該用 AV , TV 模式?
呢兩種其實有什麼分別?and點樣setting先至係最好?麻煩各位師兄指教~~謝謝

[terleung]

it's a difficult question because it really depends on what you want express through the photos. Av mode lets you manually fix the aperture at a specific value, all the other settings will be automatically determined by the camera. This means if you want to control the depth of field you should use Av mode. For shooting race cars, controlling depth of field is not the first piority so Av mode may not be the best mode in this situation. On the contrary Tv mode lets you manually fix the shutter speed and thus it is useful in situations where shutter speed is more important then depth of field. Sometimes you want to make sure the shutter speed is low (i.e. shooting fireworks, light painting, etc.) but in your situation you want to make sure the shutter speed is high as you want to capture fast moving cars.

Regarding the actually setting values, there is no solid answer because it depends on a lot of other factors: lighting of the scene, speed of the cars, iso value, and technique that you want to use. In general, if you are using panning technique (follow the car's movement with the lens) you can try a relatively lower shutter speed as this can express the motion of the car by bluring the background, but if you are using focus trap technique (set the focusing distance manually and wait for the car to appear in the viewfinder and take the photo), you certainly want to use a higher shutter speed as you want to freeze the car in your photo.

[wing769394]

兩者都係用同一條方程式。
已知X，求Y。
已知Y，求X。

一里通百里明，兩者都能夠影到靚相。

[V.Chan]

影行走中賽車要有清徹的戰車影像係必須用高速快門拍攝,而且支鏡除時要移動去追車,相中背景多數炒到飛起,這時甚麽景深都無效.所以攝快車用AV鎖定快門在高速狀態,效果比較理想.

[wing769394]

ISO 係Z，
方程式一定會包含
X，Y，Z，缺一不可。

[wing769394]

我會用TV
shutter speed 2000，ISO AUTO
唔夠快既，
shutter speed 3000，ISO AUTO
再唔夠快既，
shutter speed 4000，ISO AUTO
.
.
.

[wing769394]

更正

我會用TV
shutter speed 1/2000，ISO AUTO
唔夠快既，
shutter speed 1/3000，ISO AUTO
再唔夠快既，
shutter speed 1/4000，ISO AUTO
.
.
.

[V.Chan]

sorry! 本人更正係用Tv mode鎖定快門而不是Av.

[soonerorlater]

absolutely TV mode.

[九龍人]

我會建議用M mode.因為用Tv mode好易會光圈唔夠細或者唔夠大.而且依賴反射式測光,增加不穏定因素,舉例影黑色車同白色車曝光已經好唔同,如果現場唔係時光時暗.你預先搵啱咗光圈,快門,iso組合之後只要專心構圖及pan鏡已可.無論車身係乜顏色,構圖中車身跟路面比例係幾多都唔會搞到時光時暗.要pan中一架車又好效果唔會張張得,啱啱最靚嗰張曝光衰咗就真係好可惜.
另外想有動感唔好用1/2000秒咁快,咁架車會完全靜止,背景亦唔會花,不如影泊喺度既車仲容易.我建議最快只用到1/250秒,其實己經麻麻地,最好係1/100秒甚至更慢.當然影形面而來既車羣,唔係pan鏡,就可以快啲.

[wing769394]

九龍人

講得好岩
pan鏡黎講，快門慢D反而會好D，有動感