[ichitakap]

想問下光圈係F5.6或以下係咪好難全景清?
因為影完出黎個邊緣位有時都好blur~

[Obi-Wan]

depends on
1. focal length (longer => more likely to blur)
2. f stop (smaller f stop => more likely to blur)
3. CCD or sensor size (larger => more likely to blur)
4. type of lens "prime" or "zoom" (zoom lens => more likely to blur) for the same focal length
5. lens design (USUALLY more expensive lens => more ED / ULD elements => less likely to bur)
6. camera firmware (e.g. same lens on D200 has a more blur edge than D300)

[JSmith]

邊緣位蒙，....支鏡唔靚多啲
要全景清(好大景深)f7.1 或以上

[ichitakap]

小弟用緊 450D + 24-105MM F4L IS
個F4光圈~ 24MM 度~
中間清~但放大 100% 邊緣唔係好SHARP~

[Obi-Wan]

not always "要全景清(好大景深)f7.1 或以上 ", it depends on focal length & sensor size etc.

For my 10-22 @14mm on 20D, edge & center both sharp at f5.6

For large format films such as those of Ansel Adams, even f32 is not sharp to edge (may be that's why 'f64 club' formed, ^_^)

therefore "要全景清(好大景深)f7.1 或以上 " is just a common misconcept

[JSmith]

我冇misconcept，講俾新手聽，講咁複雜做乜

[Obi-Wan]

複雜???
just very simple photography principles if you read photography books or search google

[JSmith]

咁你想講俾我聽定係講俾樓主聽？
如果係想講俾我聽，多謝了，我唔需要，留返俾樓主吧。我只係想簡簡單單咁講俾樓主知，樓主亦只係講得好少.....原來係聞相。
到此為止