Saiba como tirar foto em movimento sem perder a qualidade!

6 minutos para ler

Tirar foto em movimento e registrar o borrão das luzes de um carro, por exemplo, é uma tarefa que requer algumas técnicas simples para se conseguir o efeito sem comprometer a qualidade da imagem.

Além de atentar para a velocidade do obturador, é importante pensar nas luzes e em um dispositivo de suporte, além das outras dicas expostas a seguir. Interessado em aprender de maneira simples e prática como fazer o truque? Então, continue a leitura deste post e confira as informações especiais que preparamos para você sobre o tema!

Velocidade do obturador

Para começar a planejar como tirar foto em movimento, o primeiro passo é entender de que maneira a velocidade do obturador influencia a entrada de luz na câmera. Esse dispositivo funciona semelhantemente a uma cortina que determina o tempo que a luminosidade vai ter para entrar em contato com o filme ou com o sensor.

Velocidades altas, como 1/1.000, indicam que o mecanismo vai se abrir e se fechar rapidamente, congelando-se, assim, uma imagem em movimento. Se o fotógrafo, por exemplo, decide registrar o movimento de carros na rua, uma velocidade alta dessa vai registrar uma fração pequena de segundos, como se o automóvel estivesse parado por um instante.

Ao contrário, uma velocidade baixa, como 30 segundos, indica que o obturador permanecerá aberto por um espaço de tempo considerável. Assim, em vez de se registrar um objeto estático, parte do movimento também será captado. É dessa maneira que se faz, portanto, o tipo de foto que registra o borrão das luzes de um carro. 

Por isso, o primeiro passo é entender que é preciso configurar o obturador para trabalhar com velocidades baixas. Outras dicas, como veremos a seguir, evitam problemas colaterais e garantir a qualidade da imagem.

Tripé

Como a câmera vai registrar o movimento durante um período considerável de tempo, é preciso que ela esteja apoiada em alguma estrutura que dê suporte a ela. Do contrário, trepidações podem ocorrer e causar tremores indesejados na imagem.

Assim, para fazer esse tipo de foto, é importante colocar a câmera em algum suporte, que pode, inclusive, ser improvisado a partir de algo que exista no próprio ambiente. Entretanto, para se ter maior praticidade e evitar contratempos, o mais indicado é investir em um tripé.

Com ele, é possível decidir a altura e a inclinação desejadas. Além disso, muitos modelos contam com uma bolha de precisão, responsável por indicar se o material de apoio se encontra nivelado. Isso pode ser primordial para evitar que o horizonte da paisagem registrada fique torto, o que pode ocorrer sobretudo em terrenos irregulares.

Fotos em sequência

Quer outra dica para não perder o clique perfeito nessas condições? Como o objeto que será fotografado estará em movimento, pode ser interessante apostar no uso de fotos em sequência para garantir o melhor registro.

Em algumas câmeras, essa opção está presente no botão que sinaliza o modo de disparo. Nele, você pode determinar o disparo contínuo e programar quantos segundos quer que a máquina espere antes de começar a registrar a imagem.

Fazer isso também é útil porque, assim, evita-se que o próprio contato do dedo com o botão cause possíveis trepidações desnecessárias. Por isso, não deixe de colocar essa dica em prática e faça o teste!

Iluminação

Como o obturador ficará aberto por um tempo considerável, pode ser que entre muita luz na câmera. Assim, a foto corre o risco de estourar. Por isso, tente combinar a alta velocidade do dispositivo a aberturas pequenas do diafragma. 

Para quem não se lembra, quanto maior o número desse mecanismo da lente, menor é a abertura. Assim, uma abertura de diafragma de número 22 é menor que uma de número 5.6, por exemplo.

Dependendo da situação, mesmo o maior número possível pode não ser suficiente para equilibrar a luminância. Por isso, vale a pena ter consigo dispositivos como filtros mais escuros, que, acoplados à objetiva, ajudam a impedir que a luz estoure. 

O filtro polarizador, além de cumprir esse papel, é também útil nos casos em que se pretende fotografar automóveis, por exemplo, porque também reduz o reflexo presente nas janelas dos carros.

Foco

Sabemos que, para fazer uma foto perfeita, é importante focar no objeto que desperta o interesse central na composição, certo? Porém, você já pensou que essa pode ser uma tarefa difícil se essa fonte de interesse estiver em movimento?

Para resolver essa questão, ajuste o modo de auto-focus segundo a opção Al Servo. Com ele acionado, é só focar inicialmente o objeto e manter pressionado o botão, acompanhando o movimento.

Depois, é só se preocupar em fazer o disparo quando o enquadramento e a composição forem as desejadas, pois a câmera fará o trabalho de acompanhar o objeto de interesse e mantê-lo focado em toda a sua trajetória.

Composição

Pensadas as condições de suporte, velocidade, iluminação, números de disparos e foco, é hora de planejar algo essencial que é, na verdade, a base de qualquer boa produção fotográfica.

Afinal, além da parte técnica, a estética, o enquadramento e a composição são imprescindíveis para garantir uma foto criativa, original e atraente visualmente. Para tanto, avalie o cenário a ser fotografado e veja quais elementos vão ajudar você a transmitir a sensação que pretende com a foto.

Uma dica simples sobre a composição que costuma funcionar é a regra dos terços, que determina que o objeto de interesse fique na intersecção das duas linhas dispostas horizontalmente e das três verticais que compõem de maneira hipotética uma imagem. Assim, a foto fica menos estática e engessada, o que é muito bem-vindo em produções de capturas em movimento.

Como vimos, unir conhecimento e técnica a uma visão criativa sobre a elaboração de imagens é essencial para tirar foto em movimento com sucesso. Há muito o que pensar antes de colocar o truque em prática, por isso treinar inúmeras vezes é primordial para se alcançar o sucesso nessa empreitada.

Gostou das informações que preparamos para você sobre o tema? Então, siga a gente no Facebook, no Twitter e no Instagram e fique sempre por dentro das novidades sobre o universo fotográfico!

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