Iyo MTF (Modulation Transfer Function) curve girafu inoshanda seyakakosha yekuongorora chishandiso chekuongorora mashandiro ekuona kwemalenzi. Nekuverengera kugona kwelenzi kuchengetedza mutsauko munzvimbo dzakasiyana-siyana dzenzvimbo, inotaridza hunhu hunokosha hwekufungidzira hwakadai sekugadzirisa, kusiyanisa kuvimbika, uye kumucheto-kune-kumucheto kuenderana. Pazasi pane tsananguro yakadzama:
I. Dudziro yeCoordinate Axes uye Curves
Horizontal Axis (Kureba kubva Pakati)
Akiso iyi inomiririra chinhambwe kubva pakati pemufananidzo (kutangira pa 0 mm kuruboshwe) kusvika kumucheto (kunogumira kurudyi), kuyerwa nemamirimita (mm). Kune yakazara-furemu lenzi, kunyanya kutarisisa kunofanirwa kubhadharwa kune huwandu kubva 0 kusvika 21 mm, iyo inoenderana nehafu diagonal ye sensor (43 mm). Kune APS-C fomati lenses, iyo yakakodzera renji inogumira ku0 kusvika 13 mm, inomiririra chikamu chepakati chedenderedzwa remufananidzo.
Vertical Axis (MTF Kukosha)
Axis yakatwasuka inoratidza mwero unochengeta lenzi mutsauko, kubva pa0 (hapana musiyano wakachengetedzwa) kusvika 1 (kunyatso chengetedza mutsauko). Kukosha kwe1 kunomiririra mamiriro edzidziso akakodzera asingagone kuwanikwa mukuita, nepo tsika dziri padyo ne1 dzinoratidza kuita kwepamusoro.
Key Curve Types
Spatial Frequency (Chikamu: mitsara miviri pa millimeter, lp/mm):
-Iyo 10 lp/mm curve (inomiririrwa nemutsetse wakakora) inotaridza kugona kubereka kwelens kwese kwese. Kukosha kweMTF pamusoro pe0.8 inowanzoonekwa seyakanaka.
- Iyo 30 lp/mm curve (inomiririrwa nemutsara mutete) inoratidza simba rekugadzirisa lenzi uye kupinza. Kukosha kweMTF kunodarika 0.6 kunoonekwa seyakanaka.
Line Direction:
-Solid Line (S / Sagittal kana Radial): Inomiririra mitsetse yebvunzo inotambanukira kunze kwepakati kubva pakati (semuenzaniso, yakafanana nespokes pavhiri).
- Dotted Line (M / Meridional kana Tangential): Inomiririra mitsara yekuyedza yakarongwa mudenderedzwa repakati (semuenzaniso, mhete-senge mapatani).
II. Performance Evaluation Criteria
Curve Height
Nharaunda Yepakati (Kuruboshwe kweHorizontal Axis): Yakakwirira MTF tsika dzeese 10 lp/mm uye 30 lp/mm macurves anoratidza inopinza yepakati imaging. Malenzi epamusoro-soro anowanzo kuwana pakati peMTF kukosha pamusoro pe0.9.
Edge Dunhu (Kurudyi kweHorizontal Axis): Kudzikira kwakadzika kweMTF tsika kumucheto kunoratidza kuita kurinani. Semuenzaniso, mupendero weMTF kukosha kwe30 lp/mm yakakura kupfuura 0.4 inogamuchirwa, nepo inodarika 0.6 ichionekwa seyakanakisa.
Curve Smoothness
Shanduko yakapfava pakati pepakati nekumucheto inoratidza kuenderana kwekufungidzira kuita kwese kwefuremu. Kudzikira kwakadzika kunoratidza kudonha kwakakosha mumhando yemifananidzo yakananga kumucheto.
Kuswedera pedyo kweS uye M Curves
Kuswedera kweiyo sagittal (yakasimba mutsetse) uye meridional (dashed line) macurves anoratidza lens's astigmatism control. Kurongeka kwepedyo kunoguma mune mamwe echisikigo bokeh uye yakaderedzwa aberrations. Kupatsanurana kwakakosha kunogona kukonzera nyaya dzakadai sekutarisa kufema kana maviri-mutsara artifacts.
III. Zvimwe Zvikonzero Zvinokurudzira
Aperture Size
Maximum Aperture (semuenzaniso, f/1.4): Inogona kuburitsa yakakwira yepakati MTF asi inogona kuguma nekudzikira kwemucheto nekuda kwekukanganisa kwemaziso.
Optimal Aperture (semuenzaniso, f / 8): Kazhinji inopa yakawedzera mwero MTF kuita pane iyo furemu uye inowanzo ratidzwa nebhuruu pamagirafu eMTF.
Zoom Lens Variability
Kune ma zoom lenses, MTF macurves anofanirwa kuongororwa akaparadzana pahupamhi-ekona uye telephoto kumigumo, sezvo mashandiro anogona kusiyana nehurefu hwakatarisana.
IV. Pfungwa Dzinokosha
Mitemo yeMTF Analysis
Nepo MTF ichipa ruzivo rwakakosha mukugadzirisa nekusiyanisa, haiverengeri kune kumwe kusakwana kwemaziso senge kukanganisa, chromatic aberration, kana flare. Aya maficha anoda kumwe kuongororwa uchishandisa anowirirana metrics.
Cross-Brand Kuenzanisa
Nekuda kwekusiyana kwemaitiro ekuyedza uye mwero pakati pevagadziri, kuenzanisa kwakananga kweMTF macurves pamhando dzakasiyana kunofanirwa kudzivirirwa.
Curve Kugadzikana uye Symmetry
Kuchinja kusingaite kana asymmetry muMTF curves inogona kuratidza kusawirirana kwekugadzira kana nyaya dzekutonga.
Chidimbu chekukurumidza:
Hunhu hweHigh-Performance Lenses:
-Iyo yese 10 lp/mm curve inoramba iri pamusoro pe0.8
- Pakati 30 lp/mm inodarika 0.6
-Edge 30 lp/mm inodarika 0.4
- Sagittal uye meridional curves yakanyatso kuenderana
-Smooth uye zvishoma nezvishoma MTF kuora kubva pakati kuenda kumucheto
Yekutanga Yekuongorora Yekutarisa:
- Pakati 30 lp/mm kukosha
-Dhigirii remupendero MTF attenuation
-Kusvika pedyo kweS uye M curves
Kuchengeta kunaka munzvimbo dzese nhatu kunoratidza zvakanyanya dhizaini yekugadzira uye kuvaka mhando.
Nguva yekutumira: Jul-09-2025