Utilizzo del flash incorporato

Distanza e diaframma usando il flash incorporato

■Fotografando col flash, esiste una relazione tra il numero guida, il diaframma e la distanza del soggetto. Calcolare se il flash non è sufficiente e regolare di conseguenza le condizioni di ripresa.

●Numero guida del flash incorporato

Sensibilità

Numero guida del flash incorporato

ISO 100

13

ISO 200

18.4

ISO 400

26

ISO 800

36.7

ISO 1600

52

Calcolo del diaframma in base alla distanza

La formula seguente calcola il diaframma in base alla distanza di ripresa.

Diaframma F = Numero guida ÷ Distanza di ripresa

Esempio)

Con sensibilità [ISO 200] e distanza di ripresa 6.1 m, il diaframma risulta: F = 18.4 ÷ 6.1 = 3

Se il numero risultante (3, nell’esempio sopra) non è tra quelli previsti per il diaframma, normalmente si usa il più vicino numero inferiore (2,8, in questo caso).

Calcolo del campo di utilizzo in base al valore del diaframma

■La formula seguente calcola la distanza tra flash e soggetto per diversi valori di diaframma.

Distanza massima del flash L1 =

Numero Guida ÷ Diaframma

Distanza minima del flash L2 =

Distanza massima del flash ÷ 5*

*Il valore 5 utilizzato nella formula è una costante riferita all’uso del solo flash incorporato.

Esempio)

Quando la sensibilità è [ISO200] e il diaframma F4

L1 = 18.4 ÷ 4 = 4.6 (m) circa

L2 = 4.6 ÷ 5 = 0.9 (m) circa

Quindi il flash può essere impiegato a distanze comprese tra 0.9 m e 4.6 m circa. Non è possibile utilizzare il flash quando la distanza del soggetto è inferiore a 0.8 m. Utilizzando il flash a distanze minori di 0.8 cm, si ottengono zone sfumate ai bordi della fotografia, la luce non è distribuita in modo uniforme e l’immagine può risultare sovraesposta.

(104)

Page 104 Page 106
Page 105
Image 105
Samsung ER-GX20ZBBB/E1 Calcolo del diaframma in base alla distanza, Distanza e diaframma usando il flash incorporato, 104
Page 104 Page 106

ER-GX20ZBBA/E1, ER-GX20ZBBB/E1, ER-GX20ZBBC/E1, ER-GX20ZBBA/IT specifications

The Samsung ER-GX20Z series, which includes models like ER-GX20ZBBA/NL, ER-GX20ZBBC/E1, ER-GX20ZBBC/DE, ER-GX20ZBBA/FR, and ER-GX20ZBBB/E1, represents a significant advancement in the personal grooming market. Designed for discerning users who value precision and efficiency, these grooming devices are equipped with a multitude of features that enhance usability and performance.

At the core of the ER-GX20Z series is its cutting-edge blade technology. The blades are crafted from high-quality stainless steel, ensuring durability and sharpness that guarantees a clean and precise cut. Many of the models in this series feature a unique 45-degree blade angle that promotes a smoother trimming experience, thereby reducing pulling or tugging during use. This feature is essential for achieving an even trim, whether users are styling beards, mustaches, or hair.

One of the standout characteristics of the ER-GX20Z series is its adjustable cutting length settings, which cater to varying grooming styles. Users can effortlessly customize their trim length to achieve everything from a close shave to longer styles, accommodating a range of preferences. This versatility makes the devices suitable for all hair types and styles.

Additionally, these models often incorporate an ergonomic design for comfortable handling. The lightweight construction and strategically placed buttons enhance usability, allowing users to maneuver the device with ease, even during extended grooming sessions. The rubber grip provides added stability, ensuring precision cuts without slippage.

Another key technological feature of the ER-GX20Z series is its cordless functionality. Equipped with a powerful battery, these devices can maintain a robust performance throughout grooming sessions without the inconvenience of cords. Users can enjoy the freedom of movement, making the grooming experience more enjoyable and efficient.

For those who appreciate added features, certain models in the series also come with a built-in vacuum system that captures hair clippings, leading to a cleaner grooming environment. This is particularly beneficial for users who wish to minimize their cleanup time after grooming.

Furthermore, the ER-GX20Z series is designed for easy maintenance, with detachable parts that simplify cleaning. This ensures that the grooming tool remains hygienic and performs optimally over time.

In summary, the Samsung ER-GX20ZB series offers an impressive combination of advanced blade technology, adjustable cutting lengths, ergonomic design, cordless operation, and efficient cleaning features. Whether for personal use or professional grooming, these devices are engineered to provide an exceptional experience, making them a worthwhile addition to any grooming kit.
Top Page Image Contents