Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

http://vnreview.vn/tu-van-anh-so/-/view_content/content/980824/meo-chup-anh-phong-canh-sac-net 1/10

nh gi Tin tc T vn PR News Download

T VN nh s

Cch chp nh phi sng trn

smartphone

Hng dn chp nh cn cnh -

Phn I

Mo "ly nt trc" trong nhip

nh

Th Su, ngy 28/02/2014 17:02 GMT +7

Mo chp nh phong cnh sc nt

Mt trong nhng yu cu quan trng nht ca chp nh phong cnh l m bo rng cc thnh

phn quan trng ca bc nh u nm trong vng nt. i khi, bn phi ly nt c nhng vt

th ch cch bn vi mt v c nhng vt th cch bn vi km.

Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

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Do , bn cn phi m bo chc chn rng DOF ( su trng nh) ca bn ln thu li cc chi tit

cn thit sc nt trn bc nh.

Khi bn ly nt trn mt im trong khung hnh ca mnh, thc t l bn ang ly nt trn mt mt phng

song song vi cm bin ca my hy gi mt phng ny l "mt phng nt". V mt l thuyt, tt c

nhng vt th nm trc hoc sau mt phng ny u khng nm trong vng nt ht mc c th. Tuy

vy, trong bc nh s c mt vng quanh mt phng nt, trong cc vt th nt i vi mt ngi.

Do , bi ton m bn cn gii quyt l xc nh mt phng song song vi cm bin s cho nt cao

nht, cng nh 2 gii hn nm trc v sau ca mt phng nt ny. Ni cch khc, bn cn xc nh v tr,

ranh gii gn v xa ca DOF.

Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

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V d cho thy DOF vi tiu c, khu v im ly nt c xc nh. 1/3 ca DOF s nm pha trc

mt phng nt, trong khi 2/3 cn li nm sau mt phng nt.

Trong biu pha trn, DOF khng ln thu li ton b cnh rng trong khong nt, v do cc

ngn cy pha sau s nm ngoi vng nt. Tuy vy, bn hon ton c th iu chnh m rng hoc thu

nh DOF thng qua 3 yu t: tiu c, khu v khong cch ti im ly nt.

Trong bi vit ny, chng ta s khng bn ti yu t kch c cm bin, bi kch c cm bin l yu t m bn

la chn khi mua my nh v sau s khng th thay i (tr khi bn i my). Tuy vy, cn phi ch r

rng cm bin my nh cng ln th DOF s cng nh v cc mu my nh khc nhau s c khong DOF

khc nhau.

Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

http://vnreview.vn/tu-van-anh-so/-/view_content/content/980824/meo-chup-anh-phong-canh-sac-net 4/10

Ba yu t gm tiu c, khu v khong cch ti im ly nt s nh hng ti DOF nh sau:

- Tiu c: Thng thng, bn s la chn tiu c khi phi cnh. Khi bn thay i tiu c, bn s thay i

trng nhn. Do , s c t ngi thay i tiu c ch thay i DOF. Tuy vy, tiu c vn s nh hng

ti DOF. Khi chp gc rng (tiu c nh), bn s c DOF ln hn l khi chp tele (tiu c ln).

- Khu : Yu t nh hng nhiu nht ti DOF l khu . Khi chp khu nh (tng ng vi s f

ln), bn s c DOF ln hn. Ngc li, vi khu ln (s f nh), bn s c DOF nh. Bn nn la chn

mt khu nh (s f ln) va phi nhm trnh hin tng nhiu thng xuyn xy ra trn khu nh.

Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

http://vnreview.vn/tu-van-anh-so/-/view_content/content/980824/meo-chup-anh-phong-canh-sac-net 5/10

Hin tng nhiu khin cc chi tit khng c sc nt cc khu nh (s f ln)

- Khong cch ti im ly nt: Bn cnh tiu c v khu , la chn v tr t mt phng nt s nh hng

ti v tr cui cng ca DOF. Khong cch t im ly nt ti my nh cng ln th DOF s cng ln. Do ,

khi chn tiu c, bn cn kt hp gia khu v khong cch ti im ly nt to ra mc DOF ph

hp.

Khong cch siu ly nt

Mt trong nhng cch m bo rng ton b khung hnh u nm trong vng nt (cc chi tit c mc

sc nt va phi) l m bo rng DOF bao trm t vng pha trc ca khung hnh ti v cc. t

c iu ny, bn s ly nt ti ng "khong cch siu ly nt" ("hyperfocal distance"): Vi mi tiu c v

khu xc nh, bn c th la chn c mt im ly nt sao cho ton b khung hnh u nm trong

DOF.

Do , bng cch la chn khu chnh xc v di chuyn im ly nt ti mt khong cch no s gip

cho ton b khung hnh nm trong vng nt. Khi ly nt vo ng khong cch siu ly nt, bn cn

phi ch rng mc gii hn gn ca DOF s nm v tr cch bn mt khong bng 1/2 khong siu ly

nt.

Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

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Vic tnh ton ra khong cch siu ly nt khng phi l n gin, do bn c th s dng cc cng c

ph tr trn trang web hoc ng dng di ng (iOS v Android). Tuy vy, sau mt thi gian bn s hc

c cch t xc nh khong siu ly nt.

Chn khu

Bt k l bn chn im ly nt (hay ni cch khc l chn mt phng ly nt) u, 1/3 ca DOF cng s

nm trc mt phng ly nt v 2/3 nm sau mt phng ly nt. Do , mt cch d dng a c

khung hnh vo vng nt l chn khu nh, v d nh f22 hoc f18 ri chn im ly nt vo ng im

nm cch my nh ng 1/3 khong cch t my nh ti im xa nht ca khung hnh.

Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

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y khng phi l mt cch thc hin sai, v thng thng bn s t c mc DOF va . Tuy vy,

trong mt s trng hp nu chn khu nh nh vy bn c th s to ra cc bc nh khng sc

nt nh mong mun (do nhiu), v do vic ly nt v cc s tr nn v ngha.

V d, bc nh bn phi c chp f8 v bc nh bn tri c chp f16:

Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

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Khi thu nh, bn s thy c 2 bc nh u nt mc chp nhn c. Tuy vy, do mu vt chnh trong

bc nh l cc cnh l b ng bng, khi zoom 100% nh hnh di y th bn s nhn thy bc nh f8 c

nt tt hn hn bc nh chp ti f16. C 2 bc nh u c DOF t ti v cc.

Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

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78Like

k thut chp nh , kinh nghim chp nh , chp nh phong cnh , hng dn chp nh , mo chp nh

p , hc chp nh

Cc tin khc

Vn nhiu s xy ra trn tt c cc ng knh khi bn chn khu qu nh, c bit l trn cc vng

cnh ca nh v trn cc loi ng knh gi thp. Thng thng, khu "chun" s nm t f8 n f11. Do

, vic la chn khu ph hp trnh nhiu s l cc k quan trng trong nhip nh.

L Hong

Theo Digital Photography School

kin ca bn

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Ngy 9 thng 6 nm 2014 Mo chp nh phong cnh sc nt - VnReview - T vn nh s

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