Ungasarudza Sei Kana Lenzi Iine Hunhu Hwakanaka Hwemifananidzo?

Kutonga kana mhando yemifananidzo yelenzi yemazisozvakanaka, zvinodiwa mimwe mitemo yekuyedza, yakadai sekuyedza kureba kwenzvimbo, nzvimbo yekuona, resolution, nezvimwewo zvelenzi. Izvi zvese zviratidzo zvemazuva ano. Kunewo zvimwe zviratidzo zvikuru, zvakaita seMTF, distortion, nezvimwewo.

1.MTF

MTF, kana kuti optical modulation transfer function, inogona kuyera mativi emufananidzo, akadai semashoko akadzama, kusiyana, uye kujeka. Ndiyo imwe yezviratidzo zvekuongorora zvakakwana kunaka kwemifananidzo yelenzi.

MuMTF two-dimensional coordinate curve, Y axis inowanzo kuve kukosha (0~1), uye X axis ndiyo spatial frequency (lp/mm), kureva kuti, nhamba ye "line pairs". Low frequency inoshandiswa kuongorora musiyano wemufananidzo mushure mekutora mifananidzo, uye high frequency inoshandiswa kuongorora kujeka uye resolution ye lens, kureva kugona kusiyanisa zvinhu zvakasiyana.

Semuenzaniso, kune malenzi emifananidzo, 10lp/mm inowanzo shandiswa kuongorora mhedzisiro yekuenzanisa, uye kukosha kweMTF kunowanzo pfuura 0.7 kuti kuonekwe sekwakanaka; frequency yakakwira inoongorora 30lp/mm, kazhinji inopfuura 0.5 muhafu yenzvimbo yekuona, uye inopfuura 0.3 pamucheto wenzvimbo yekuona.

Kuongororwa kweMTF

Kune zvimwe zvishandiso zvemaziso kanamagirazi eindasitiri, dzine zvinodiwa zvakanyanya kuti dziite mafrequency akawanda, saka tingaverenga sei mafrequency akawanda atinoda kuongorora? Kutaura zvazviri, zviri nyore kwazvo: mafrequency = 1000/(2×sensor pixel size)

Kana saizi yepikisiki yesensor yauri kushandisa iri 5um, saka frequency yakakwira yeMTF inofanira kuongororwa pa100lp/mm. Kana kukosha kwakayerwa kweMTF kwakakwira kupfuura 0.3, igirazi rakanaka.

2.Kusarongeka

MTF haigone kuratidza kusarongeka kwekukanganiswa, saka kukanganiswa kwakanyorwa zvakasiyana. Kukanganiswa, kana kushanduka, kunogona kukamurwa kuita kukanganiswa kwepincushion uye kukanganiswa kwebharero.

Kukanganiswa kwemaonero kunoenderana nemunda wekuona. Kana munda wekuona wakakura, kukanganisa kwacho kunowedzera. Kune magirazi emakamera nemagirazi ekutarisa, kukanganisa kuri mukati me3% kunogamuchirika; kune magirazi ane angle yakafara, kukanganisa kunogona kuva pakati pe10% ne20%; kune magirazi efisheye, kukanganisa kunogona kuva 50% kusvika 100%.

Mhedzisiro yekukanganiswa kwelenzi yefisheye

Saka, ungaziva sei kuti unoda kudzora kukanganiswa kwemalenzi kwakadii?

Kutanga, unofanira kusarudza kuti chii chaurilenziinoshandiswa. Semuenzaniso, kana ikashandiswa mukutora mifananidzo kana kutarisa, kukanganiswa kwelenzi mukati me3% kunobvumirwa. Asi kana lenzi yako ichishandiswa pakuyera, kukanganiswa kwacho kunofanira kunge kuri pasi pe1% kana kutodzikira. Ehe, izvi zvinoenderanawo nekukanganisa kwesystem kunobvumidzwa nesystem yako yekuyera.

Pfungwa Dzekupedzisira:

Nekushanda nenyanzvi dzepaChuangAn, magadzirirwo nekugadzirwa kwezvinhu zvinoitwa nemainjiniya vane hunyanzvi. Sechikamu chekutenga, mumiriri wekambani anogona kutsanangura zvakadzama ruzivo rwakadzama nezverudzi rwelenzi yaunoda kutenga. Zvigadzirwa zvelenzi zveChuangAn zvinoshandiswa mumhando dzakasiyana-siyana, kubva pakuongorora, kuskena, madrone, mota kusvika kudzimba dzakangwara, nezvimwewo. ChuangAn ine mhando dzakasiyana dzelenzi dzakapedzwa, dzinogonawo kugadziriswa kana kugadziriswa zvichienderana nezvaunoda. Tibate nekukurumidza sezvinobvira.