[kenchan2010]

各位智者
請教Canon EF 17-40mm f/4.0L USM 淺景深效果如何，與sigma18-55mm2.8比較又如何？請指教

[Xplore]

40mm" f/4.0" 光圈玩淺景深方面.................. L 鏡都唔係一定識飛
17-40mm 都係影埸景適合D

[fever20d]

短蕉距 + 小光圈， 可以講話 "無"。

[ousi]

要玩景深, 用小小白會好d wor.
始終, 17-40L係比人用來影景的, 所以景深一定深

[snoopy史]

sigma18-50F2.8，用盡50mm及F2.8，都可以有一定的淺景深！

不過開盡F2.8時，支鏡的解像力會稍遜！

[bc_hui]

F4 = 小光圈 ??
i dont think so.

[tommywhite03]

短蕉距 + 小光圈， 可以講話 "無"。

--------------------------------------------------
唔係化？？
Canon EF 17-40mm f/4.0L USM
17mm ISO800 f/4 1/60"s

[Minkun]

http://www.dcfever.com/photosharing/enlargephoto.php?photoID=212233

[ousi]

DOF is related to focus distance.

If you focus sth that is ~38cm (maybe the closest AF point for 17-40L), you'll get that effect.

However, you won't shoot a model in such a close proximity.

If you don't believe, try focusing your eyes on a finger that is 10-20cm away. You'll see the shallow DOF even for your own very eyes!

[tommywhite03]

依家討論Canon EF 17-40mm f/4.0L USM 淺景深效果如何，
首先當然wide Lens唔係用o黎玩淺景深，
玩淺景深最好?50mm f/2.8 以上，
但我可以講句依支Lens景深唔係"無"，
f/4 亦唔係叫"小光圈"，
如果你識得利用支鏡，景深亦都可以好淺，
主體越近，後景深越淺。
用17mm wide o黎影，如果model 企遠D，咪好細粒？
如果model ?好遠，用tele 都未必景深淺，
無意得罪，有錯請指正。

小小白 200mm f/4 ISO 100 1/800"s

[tandychow]

我覺得唔係光圈大小,(當然F2.8好過F4係SURE的啦)
焦距17-40mm 點解要考慮他的淺景深效果呢?
其實你係想做到D咩效果同影D咩呀?
考慮下構圖中有冇o的咩特別雖要.