motti - unina.it
TRANSCRIPT
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Macrofotografia
Una tecnica fotografica che permette di otteneretramite forti rapporti di ingrandimento immagini disoggetti molto piccoli e comporta un ingrandimentodel soggetto di almeno 1 volta (1X), ovvero unrapporto di riproduzione di almeno 1:1
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microscopia elettronica10:1 ÷ 500000:1fotomicrografia ottica20:1 ÷ 2500:1macrofotografia1:1 ÷ 20:1
close-up (fotografiaravvicinata)1:n ÷ 1:2
disciplinaingrandimenti
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Entomologica
Macrofotografia
Industriale
Botanica
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Fotocamere compatte
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Obiettivi xmacrofotografia
Gli obiettivi macro sono progettati per lavorare al meglio adistanze brevi e per rapporti di riproduzione da 1:10 a 1:1.
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Tubi di prolunga
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Lenti addizionali
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Anelli di inversione ottica
Da usare con focali comprese fra 24 e 50 mm
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Soffietto
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Cavalletto
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Problemi
Profondità di campo
Luce
Soggetto e sfondo
Ambientali
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Profondità di campo
Tabella delle profondità di campo per l'obiettivo Canon EF 100mm f/2.8 Macro USM
infinito0.9670.0850.0130.0070.0040.002PdCinfinito3.5661.0430.4950.3970.3500.313DL17.5802.5990.9580.4820.3900.3460.311DV
16
infinito0.4730.0420.0070.0030.0020.001PdCinfinito3.2581.0200.4920.3950.3490.312DL35.0602.7850.9780.4850.3920.3470.311DV
8
infinito0.1720.0160.0020.0010.0010.000PdCinfinito3.0901.0060.4890.3940.3490.312DL95.8902.9180.9900.4870.3930.3480.312DV
F2.8
infinito310.490.390.350.31DistDiaframma
in cui:Dist = Distanza, in metriDV = Distanza Vicina, in metriDL = Distanza Lontana, in metriPdC = Profondità di campo, pari a DL – DV, in metri.
Dist = Distanza, in metriDV = Distanza Vicina, in metriDL = Distanza Lontana, in metriPdC = Profondità di campo, pari a DL – DV, in metri
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f/2.8
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f/8
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f/16
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Profondità di campo
Suggerimenti
•Usare, quando possibile, diaframmi chiusi;•Non andare oltre f/16 per evitare effetti di diffrazione;•Quando si è costretti a diaframmi aperti, tenere il piano del sensore quanto più possibile parallelo all’oggetto soprattutto se questo è esteso;•Se si usano diaframmi aperti, concentrare il fuoco su particolari importanti;•Usare il focus stacking se servono soggetti totalmente a fuoco
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Luce
Naturale Artificiale
Più bassa è la sensibilità, maggiore sarà la nitidezza
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Flash anulare
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Flash
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Flash
!!!!
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Flash
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Luce naturale
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Pannelli riflettenti
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Pannelli riflettenti
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Pannelli riflettenti
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Soggetto e sfondo
Sfondo nero
Sfondo sfocato
Sfondo scuro
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Sfondo sfocato
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Sfondo nero
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Sfondo nero
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Sfondo scuro
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Regola dei terzi - Diagonale
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Regola dei terzi - Diagonale
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Regola dei terzi - Diagonale
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Regola dei terzi - Diagonale
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Regola dei terzi - Diagonale
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Regola dei terzi - Diagonale
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Regola dei terzi - Diagonale
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Ambientali
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