Ungawugweba njani ukuba ilensi inomgangatho olungileyo wokuthatha imifanekiso?

Ukugweba ukuba umgangatho womfanekiso we-ilensi yokukhanyailungile, kufuneka imigangatho yovavanyo ethile, njengokuvavanya ubude befocal, intsimi yokujonga, isisombululo, njl.njl. yelensi. Zonke ezi zizalathisi zesiqhelo. Kukwakho nezinye izalathisi eziphambili, ezifana ne-MTF, ukuphazamiseka, njl.njl.

1.I-MTF

I-MTF, okanye umsebenzi wokudlulisa i-optical modulation, inokulinganisa iinkalo zomfanekiso, ezinje ngeenkcukacha, umahluko, kunye nokucaca. Yenye yeempawu zokuvavanya ngokupheleleyo umgangatho womfanekiso welensi.

Kwi-MTF two-dimensional coordinate curve, i-Y axis idla ngokuba yi-value (0~1), kwaye i-X axis yi-spatial frequency (lp/mm), oko kukuthi, inani "lee-line pairs". I-low frequency isetyenziselwa ukuvavanya umahluko womfanekiso emva komfanekiso, kwaye i-high frequency isetyenziselwa ukuhlola ukucaca kunye nesisombululo selensi, oko kukuthi, ukukwazi ukwahlula iinkcukacha.

Umzekelo, kwiilensi zefoto, i-10lp/mm idla ngokusetyenziswa ukuhlola isiphumo somahluko, kwaye ixabiso le-MTF ngokubanzi liphezulu kune-0.7 ukuze lithathwe njengelilungileyo; i-frequency ephezulu ihlola i-30lp/mm, idla ngokuba nkulu kune-0.5 kwisiqingatha sendawo yokujonga, kwaye ingaphezulu kune-0.3 kumda wendawo yokujonga.

Uvavanyo lwe-MTF

Kwezinye izixhobo zokukhanya okanyeiilensi zoshishino, baneemfuno eziphezulu ze-frequency ephezulu, ngoko ke singayibala njani i-frequency ephezulu esifuna ukuyihlola? Enyanisweni, ilula kakhulu: i-frequency = 1000/(2×ubungakanani be-pixel yesinzwa)

Ukuba ubungakanani be-sensor pixel oyisebenzisayo yi-5um, ngoko ke i-frequency ephezulu ye-MTF kufuneka ihlolwe kwi-100lp/mm. Xa ixabiso elilinganisiweyo le-MTF liphezulu kune-0.3, ilensi ilungile.

2.Uphazanyiso

I-MTF ayinakubonakalisa ukuphambuka kokuphambuka, ngoko ke ukuphambuka kudweliswe ngokwahlukeneyo. Ukuphambuka, okanye ukuguqulwa, kunokwahlulwahlulwa kube kukuphambuka kwepincushion kunye nokuphambuka kwebharele.

Ukugqwetheka kunxulumene nebala lembono. Okukhona ibala lembono likhulu, kokukhona ukugqwetheka kukhulu. Kwiilensi zekhamera eziqhelekileyo kunye neelensi zokujonga, ukugqwetheka ngaphakathi kwe-3% kuyamkeleka; kwiilensi ezinee-engile ezibanzi, ukugqwetheka kunokuba phakathi kwe-10% kunye ne-20%; kwiilensi ze-fisheye, ukugqwetheka kungaba yi-50% ukuya kwi-100%.

Isiphumo sokuphambuka kwelensi ye-fisheye

Ngoko ke, ufumanisa njani ukuba ufuna ukulawula ukugqwetheka kwelensi okungakanani?

Okokuqala, kufuneka ufumanise ukuba yintoni nailensiisetyenziselwa. Umzekelo, ukuba isetyenziswa ekufoteni okanye ekuboneleleni, ukugqwethwa kwelensi ngaphakathi kwe-3% kuvumelekile. Kodwa ukuba ilensi yakho isetyenziselwa ukulinganisa, ukugqwethwa kufuneka kube ngaphantsi kwe-1% okanye ngaphantsi. Kakade ke, oku kuxhomekeke kwimpazamo yenkqubo evunyelwe yinkqubo yakho yokulinganisa.

Iingcinga Zokugqibela:

Ngokusebenzisana neengcali eChuangAn, zombini uyilo kunye nokuveliswa kulawulwa ziinjineli ezinobuchule obuphezulu. Njengenxalenye yenkqubo yokuthenga, ummeli wenkampani unokuchaza ngokweenkcukacha ulwazi oluthile malunga nohlobo lwelensi ofuna ukuyithenga. Uthotho lweemveliso zelensi zikaChuangAn zisetyenziswa kwiintlobo ngeentlobo zezicelo, ukusuka ekujongeni, ukuskena, iidrone, iimoto ukuya kumakhaya akrelekrele, njl. IChuangAn ineentlobo ngeentlobo zeelensi ezigqityiweyo, ezinokutshintshwa okanye zenziwe ngokwezifiso ngokweemfuno zakho. Qhagamshelana nathi ngokukhawuleza.