Kuv xav tau ib tug UV-lim rau cov koob yees duab?

UV-lim - ib tug UV lim. Nws lub ntsiab lub hom phiaj - kev tiv thaiv ntawm kho qhov muag lo ntsiab muag ntawm kev puas tsuaj, plua tshauv thiab av (nws tag nrho cov sai sai txav lub lens). Tsis tas li ntawd, xws kho qhov muag ntsiab retard ultraviolet lub teeb thaum shooting nyob deb tej khoom. Tom qab cov matrix thiab zaj duab xis, nyob rau hauv sib piv rau lub qhov muag tib yog rhiab rau no hom ntawm hluav taws xob. UV-lim yog heev pab tau rau photographing nyob rau hauv ib tug mountainous cheeb tsam, nws yuav pab kom tsis txhob muaj ib tug xiav quav hniav nyob rau hauv cov duab.

Tag nrho cheeb tsam ntawm lub ultraviolet spectrum yuav muab faib ua peb yog hom twg: deb - 280 nm thiab luv luv (UV-C); nruab nrab - 320-280 nm (UV-B); thiab ib tug proximal - 400-320 nm (UV-A). Neeg cov pab kiag li lawm yog qis tshaj tus zaj duab xis, ces nws yuav siv sij hawm ib tug proximal band, thiab cov zaj duab xis yog muaj peev xwm mus kho tag nrho cov ultraviolet ntau (tab sis tus tib neeg qhov muag yuav tsis pom yog tsis nyob rau hauv ib yam ntawm cov yog hom twg). Txawm li cas los, lub possibilities ntawm zaj duab xis koob yees duab tas lub peev xwm ntawm kho qhov muag lo ntsiab muag. UV-lim txiav xws tawg ntawm 320 nm (nruab nrab thiab nyob deb ntau).

Thaum xaiv xws li ib tug cov khoom uas koj yuav tsum pib los ntawm txoj kab uas hla ntawm lub lens. Hais tias yog, mus nrhiav tau tawm uas lim yog tsim rau koj lub koob yees duab, koj yuav tsum paub lub lens txoj kab uas hla ntawm lub xov (nws qhia tias hauv lub hau). Tus nqi ntawm cov khoom nyob rau qhov luaj li cas. Txij li thaum UV-lim txoj kab uas hla ntawm 52 hli yog $ 10-15, thiab 77 mm - 30-40 dollars.

UV cov ntxaij lim dej yog muab faib ua plaub pawg qeb:

• Nruab nrab - nruab nrab, tsis muaj kob;
• Skylight - paj yeeb, yog tsim los qhia cov dluab ntawm sov xim;
• ncaj qha uv - ultraviolet;
• Taws kub nnyiab ya - tiv thaiv cov taws kub nnyiab ya.

Txawm tias lwm sib txawv, lub hom phiaj ntawm qhov no pab pawg neeg yog ib tug - lens tiv thaiv tawm tsam lwm influences, UV thiab cov xim ntawm cov pa luam yeeb. Cov feem nrov yog UV-lim thiab Skylight.

Heev feem ntau sellers Skylight hais raws li qhov zoo tshaj plaws thiab thiaj li kim, tab sis cov nyhuv ntawm sov xim nyob rau hauv cov kev yees duab yog npaj rau cov zaj duab xis cov koob yees duab rau cov duab nws yog txo mus rau zero los ntawm lub xub ntiag ntawm lub dawb tshuav nyiaj li cas xim.

Thaum xaiv xws li ib tug khoom yuav tsum tsis txhob hnov qab tias lub ntsiab muaj nuj nqi - yog kev tiv thaiv kho qhov muag lens los ntawm cov neeg kho tshuab influences thiab UV tiv thaiv, thiab lwm yam - yog theem ob. Muaj ntau amateurs nug tus filtering muaj peev xwm ntawm ultraviolet hluav taws xob, vim hais tias tus yees duab yog suab tsis ntxim (raws li cov chaw tsim tshuaj paus, lim tiv thaiv cov matrix). Raws li xws kev pab txog rau zus tau tej cov yees duab optics tuam txhab uas muag tsuas pauv nyob rau hauv nyob rau hauv pib xyaum ua kws yees duab. Yog li ntawd feem ntau pom zoo kom koj xaiv ib tug los yog lwm UV-lim yog raws li nyob rau hauv lub thaj chaw ntawm cov neeg kho tshuab kev tiv thaiv. Txawm tias kev tiv thaiv lo ntsiab muag thiab yog suav hais tias yog pheej yig tshaj, tab sis tsis txhob hnov qab tias txhua yam lens - qhov no yog feem ntau ib tug teeb meem rau cov kis ntawm cov teeb, li ntawd, nws yog ib qhov zoo tshaj plaws los yuav ib yam khoom los ntawm ib tug reputable khw, ua los ntawm cov siab zoo ntaub ntawv nrog ib tug muaj zog lub teeb kis tau tus mob.

Siv UV-ntxaij lim dej los yog tsis, yuav tsum txiav txim siab nws tus kheej ib tug pib xyaum ua kws yees duab, tab sis yuav ntsuas kom tiv thaiv cov lens, nws yog tsim nyog, vim hais tias tus nqi ntawm ib tug zoo kho qhov muag system tej zaum yuav siab dua tus nqi ntawm cov koob yees duab nws tus kheej.