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  1. Galleries
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    3. » Fractals
 
Fractals

Prove di luce

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Fractals sent on 22 Novembre 2023 (12:42) by Ricric74. 8 comments, 450 views.

Canon 6D,
Canon 6D
Sigma 105mm f/2.8 Macro DG OS HSM
Sigma 105mm f/2.8 Macro DG OS HSM
, Posa B f/22.0, ISO 100, tripod.

per questa foto ho utilizzato 2 torce UV a 365nm, ho impostato la fotocamera in posa B per catturare tutta la fosforescenza degli stami di questa gerbera e, in ultimo, ho fatto un flash con torcia visibile, in modo da ottenere il mix di luci diverse, l'effetto mi piace. #UVIVF


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avatarjunior
sent on 22 Novembre 2023 (13:14)


This comment is too long to be automatically translated, so it will be shown in its original language (Italian)  

Click here to translate the comment in English [en]


La foto e' molto ben riuscita! complimenti.

Domanda tecnica. Premesso che bisogna fare attenzione con i raggi UV e andrebbero sempre indossati gli occhiali (bastano anche quelli plastica trasparente), volevo sapere se le torce che usi hanno anche una componente "visibile".
Cioe' una volta accesi vedi luce con gli occhi o meno??

Ho comprato due led UV a 365 e misurato l'emissione con uno spettrometro e c'e' sempre una coda verso il visibile, debole ma c'e'. Considerando i lunghi tempi di esposizione questa poca luce cmq ha un suo effetto.
Mi sono procurato anche un filtro UV in modo da tagliare completamente qualunque lunghezza d'onda maggiore di 385 nm (anche minore di 325 ma poco importa).
Prima o poi iniziero' a provare. Nel frattempo volevo confrontarmi.
Insomma vorrei capire se veramente quella che si vede e' la fluorescenza (non fosforescenza) e non l'effetto di questa coda visibile.

E' una deformazione professionale, quello che importa e' il risultato che come ho detto e' molto bello.
Grazie
Peppe    


avatarsupporter
sent on 22 Novembre 2023 (13:31) | This comment has been translated    

Beautiful!

avatarsupporter
sent on 22 Novembre 2023 (13:52) | This comment has been automatically translated (show/hide original)    

Beautiful!
Hello, Alessandro

avatarjunior
sent on 22 Novembre 2023 (13:56) | This comment has been automatically translated (show/hide original)    

Hi Peppe, I'll answer you as much as I can; probably the UV sources I use also emit a component of visible light which, however, is certainly negligible in the overall balance of the emitted spectrum; I believe that the brightness of some parts of the flowers I use for this type of photo is to be attributed exclusively to UV, it is "own" light, emitted by electron excitation and not reflected as it happens for visible light; I invite you to try, the effect is always unpredictable...

avatarjunior
sent on 22 Novembre 2023 (17:02) | This comment has been automatically translated (show/hide original)    

Nice photo
congratulations
hello Niki

avatarsenior
sent on 22 Novembre 2023 (21:20) | This comment has been automatically translated (show/hide original)    

Very good workmanship. Hello

avatarsupporter
sent on 22 Novembre 2023 (21:29) | This comment has been automatically translated (show/hide original)    

Beautiful.
Greetings John

avatarsupporter
sent on 20 Febbraio 2025 (2:14) | This comment has been translated    

Fantastic!


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