Taking a Picture AF / TTL Operation

• Automatic flash sync speed control

When the flashgun is ready, your camera will automatically switch it to the flash

sync speed from program mode or or to an aperture-priority mode selected. The sync speed depends on the camera model and usually ranges between 1/30sec to 1/250sec.

When a flash shot has been taken, an "OK" symbol briefly flashes on the LCD display to confirm correct exposure.

Auto-focus "AF" measuring flash

The integrated "AF" red light beam of the flashgun supports the automatic focusing of auto-focus TTL cameras. When the prevailing light is insufficient for automatic focusing, the flashgun will project a red light beam onto the object as soon as the camera's shutter is lightly touched. The camera's auto-focus system then focuses the object by this beam of red light.

• TTL flash control

When you switch on the flashgun, it will set at TTL mode first and the LCD display indicates "TTL". When the Ready indicator lights up, press the shutter release fully to take the picture. The advanced programming and computerized circuitry of the fllashgun provides the correct amount of flash light output according to the camera's exposure measurement through the lens (TTL).

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Vivitar VIV-PRO-648 instruction manual Automatic flash sync speed control, Auto-focus AF measuring flash, TTL flash control

VIV-PRO-648 specifications

The Vivitar VIV-PRO-648 is a versatile professional-grade LED video light designed to meet the needs of videographers and photographers alike. This lighting solution combines innovative technology with user-friendly features, making it suitable for both studio and on-location shoots.

One of the main features of the VIV-PRO-648 is its impressive lumen output. With a high light output, it ensures adequate illumination for various shooting scenarios, from interviews to product photography. The fixture offers adjustable brightness settings, allowing users to manipulate the light intensity quickly to achieve the desired aesthetic.

Color accuracy is another key highlight of the VIV-PRO-648. It boasts a high Color Rendering Index (CRI) rating, typically above 95, which means colors will appear more vibrant and true to life. This quality is essential for professionals aiming to capture accurate skin tones and rich colors in their work.

The VIV-PRO-648 is equipped with flexible color temperature settings, ranging from tungsten to daylight. This adjustability allows users to match their lighting to existing ambient light conditions or create specific moods and effects in their shots. The intuitive controls make it easy to fine-tune these settings, enabling quick adjustments during a shoot.

A significant advantage of the VIV-PRO-648 is its lightweight and portable design. Weighing significantly less than traditional lighting options, it is easily transportable, making it an excellent choice for travel photographers and videographers. Additionally, it features a robust build quality that can withstand the rigors of on-the-road use.

The versatility of mounting options is also a noteworthy characteristic of this light. It comes with a standard cold shoe mount and various adaptors that allow it to be attached to different light stands or equipment setups. This adaptability enhances its practicality across numerous shooting environments.

Powering the VIV-PRO-648 is straightforward, offering options for both AC and battery operation. The dual power capability provides increased flexibility, enabling users to shoot without being tethered to a power source during on-location projects.

In summary, the Vivitar VIV-PRO-648 is an excellent investment for professionals seeking a reliable, high-performance lighting solution. With its impressive lumen output, adjustable color temperature, high CRI rating, and portability, it serves as a valuable tool in creating stunning visual content. Whether in a studio or on location, the VIV-PRO-648 lights the way to exceptional results.