Subtronic Nova, Руководство пользователя

Страница: 8 / 20

.
TTL FLASH OPERATION with digital cameras (right socket)
In contrast to analog cameras, digital cameras are not recognized automatically as each
device has a special control mechanism. Connect the camera to the right flash socket
(where there are two sockets) and set the selector switch to “TTL” or “PILOT”.
The flash gun is fully controlled by the camera, and data is continually transferred between
the two devices.
To take exposure readings, the digital camera triggers one or more preflashes.
•
The camera calculates the main flash from these readings. The camera is therefore
responsible for the correct exposure as it controls the emitted luminous intensity.
This means that the exposure can only be manipulated in this mode by adjusting the
camera, as is the case with CANON and NIKON models for example. The values
set on the back of the flash gun are transferred to the camera.
This configuration method is faster and safer than having to press several buttons
on the underwater body or in the menu.
 If the emitted luminous intensity is insufficient, i.e. if the flash gun is operating at
full power in TTL mode, the ERROR LED lights up for approx. 3 seconds and the
“flash ready” LED blinks simultaneously. If this happens, increase the aperture by
one or two settings.
As soon as the flash gun has been attached to a camera and it is ready for use, the flash
symbol in the viewfinder lights up when you gently press the shutter button. If this does not
happen, please verify whether the ready lamp on the flash gun is functioning correctly. If it
is, check whether the plug connectors are clean and connected properly.
Otherwise, follow the camera manufacturer’s instructions for using the flash function.
.
EXPOSURE COMPENSATION DIGITAL CAMERA TTL
To render more saturated colors, it is advisable to underexpose by approx. 1/3 - 2/3
aperture settings, which can be achieved using the + / - correction setting on the camera.
Modern cameras with multiple automatic exposure mechanisms frequently only use the
flash gun as a fill flash in the program setting (P). Under water, this produces weaker colors
due to the decreased light output from the flash gun.
•
You should therefore use the A setting depending upon the type of camera you are
using. Here, the camera adjusts the synchronization speed to a setting between
1/60 and 1/250 according to the ambient brightness. The aperture can be varied as
required.
•
Position M is even better, as here you retain full control over the aperture and the
speed. The flash control mechanism still operates in TTL mode, however.
Page 8 of 20