MTF (Modulation Transfer Function) curve graph e sebetsa e le sesebelisoa sa bohlokoa sa tlhahlobo bakeng sa ho lekola ts'ebetso ea optical ea lilense. Ka ho lekanya bokhoni ba lense ba ho boloka phapang ho pholletsa le maqhubu a fapaneng a sebaka, e bonts'a ka pono litšoaneleho tsa bohlokoa tsa ho nahana joalo ka qeto, bots'epehi ba phapang, le ho ts'oana ho tloha moeling ho isa ho o mong. Ka tlase ke tlhaloso e qaqileng:
I. Tlhaloso ea Coordinate Axes le Curves
Horizontal Axis (Bohole ho tloha Bohareng)
Axis ena e emela sebaka ho tloha bohareng ba setšoantšo (ho qala ho 0 mm ka ho le letšehali) ho ea moeling (e qetellang ka ho le letona), e lekantsoeng ka limilimithara (mm). Bakeng sa lilense tse feletseng, tlhokomelo e khethehileng e lokela ho lefshoa ho tloha ho 0 ho ea ho 21 mm, e lumellanang le halofo ea diagonal ea sensor (43 mm). Bakeng sa lilense tsa sebopeho sa APS-C, mofuta o loketseng o lekanyelitsoe ho 0 ho isa ho 13 mm, e emelang karolo e bohareng ea selikalikoe sa setšoantšo.
Vertical Axis (Boleng ba MTF)
Axis e otlolohileng e bontša tekanyo eo lense e bolokang phapang ka eona, ho tloha ho 0 (ha ho phapang e bolokiloeng) ho isa ho 1 (polokelo e phethahetseng ea phapang). Boleng ba 1 bo emela boemo bo nepahetseng ba theory bo ke keng ba finyelloa ka ts'ebetso, ha litekanyetso tse haufi le 1 li bontša ts'ebetso e phahameng.
Key Curve Mefuta
Maqhubu a Sebaka (Yuniti: lipara tsa mela ho millimeter, lp/mm):
- Mokokotlo wa 10 lp/mm (o emetsweng ke mola o motenya) o bontsha bokgoni ba lense ka kakaretso ba ho ikatisa. Theko ea MTF e kaholimo ho 0.8 hangata e nkuoa e le ntle haholo.
- The 30 lp/mm curve (e emetsoeng ke mola o mosesaane) e bonts'a matla a ho rarolla lense le bohale ba lense. Theko ea MTF e fetang 0.6 e nkuoa e le ntle.
Tsela ea Mola:
- Solid Line (S / Sagittal kapa Radial): E emela mela ea teko e fetelang ka ntle ho tloha bohareng (mohlala, ho tšoana le li-spokes lebiling).
– Dotted Line (M / Meridional kapa Tangential): E emela mela ea teko e hlophisitsoeng ka lidikadikwe tse bohareng (mohlala, lipaterone tse kang lesale).
II. Litekanyetso tsa Tekolo ea Ts'ebetso
Curve Height
Sebaka se Bohareng (Lehlakore le letšehali la Axis e Horizontal): Litekanyetso tse phahameng tsa MTF bakeng sa bobeli ba 10 lp/mm le 30 lp/mm curves li bontša litšoantšo tse bohareng tse bohale. Lilense tsa maemo a holimo hangata li fihlella boleng ba MTF bo bohareng ho feta 0.9.
Sebaka sa Edge (Lehlakoreng le Ka ho le letona la Horizontal Axis): Phokotso e tlase ea boleng ba MTF ho ea mathōkong e bontša ts'ebetso e betere. Ka mohlala, moeli oa MTF oa 30 lp/mm o moholo ho feta 0.4 oa amoheleha, ha o fetang 0.6 o nkoa o le motle haholo.
Curve Smoothness
Phetoho e bonolo lipakeng tsa bohareng le moeli e fana ka maikutlo a ts'ebetso ea litšoantšo e ts'oanang ho pholletsa le foreime. Ho theoha ho hoholo ho bonts'a phokotseho e kholo ea boleng ba setšoantšo ho ea ka mathōko.
Ho atamelana ha S le M Curves
Bohaufi ba sagittal (mohala o tiileng) le meridional (mothapo o otlolohileng) o bonts'a taolo ea lense ea astigmatism. Ho tsamaisana haufi-ufi ho fella ka bokeh e ngata ea tlhaho le ho fokotseha ho fokolang. Karohano e kholo e ka lebisa litabeng tse kang ho tsepamisa maikutlo ho phefumoloha kapa li-artifact tsa mela e 'meli.
III. Lintlha Tse Eketsehileng Tse Susumetsang
Aperture Size
Maximum Aperture (mohlala, f/1.4): E ka fana ka MTF e bohareng e phahameng empa e ka fella ka ho senyeha ha moeli ka lebaka la ho kheloha ha pono.
Optimal Aperture (mohlala, f/8): Hangata e fana ka ts'ebetso e leka-lekaneng ea MTF ho pholletsa le foreimi 'me hangata e totobatsoa ka boputsoa ho li-graph tsa MTF.
Atometsa Lense e fapaneng
Bakeng sa lilense tsa katametso, li-curve tsa MTF li lokela ho hlahlojoa ka thoko ho likhutlo tse kholo le telephoto, kaha ts'ebetso e ka fapana ho ea ka bolelele ba tsepamiso.
IV. Lintlha tsa Bohlokoa
Meeli ea Tlhahlobo ea MTF
Le ha MTF e fana ka lintlha tsa bohlokoa mabapi le tharollo le phapang, ha e ikarabelle bakeng sa mefokolo e meng ea optical joalo ka ho khopamisa, chromatic aberration, kapa flare. Lintlha tsena li hloka tlhahlobo e eketsehileng ho sebelisoa metrics e tlatsetsang.
Cross-Brand Papiso
Ka lebaka la ho fapana ha mekhoa ea liteko le litekanyetso har'a bahlahisi, papiso e tobileng ea li-curve tsa MTF ho mefuta e fapaneng e lokela ho qojoa.
Curve Stability le Symmetry
Ho feto-fetoha ho sa tloaelehang kapa asymmetry ho li-curve tsa MTF ho ka bontša ho se lumellane ha tlhahiso kapa litaba tsa taolo ea boleng.
Kakaretso e Potlakileng:
Litšobotsi tsa Lilense tsa Ts'ebetso e Phahameng:
- Lekhalo lohle la 10 lp/mm le lula le le kaholimo ho 0.8
- Bohareng ba 30 lp/mm ho feta 0.6
- Edge 30 lp/mm e feta 0.4
- Sagittal le meridional curves li hokahane haufi-ufi
- Boreleli le butle-butle MTF e bola ho tloha bohareng ho isa pheletsong
Maikutlo a Mantlha a Tekolo:
- Bohareng ba 30 lp/mm boleng
- Ho fokotsa boemo ba MTF
– Haufi le S le M curves
Ho boloka bokhabane likarolong tsohle tse tharo ho bontša ka matla moralo o phahameng oa optical le boleng ba mohaho.
Nako ea poso: Jul-09-2025