Pentax 540FGZ Operation Manual - Page 27

Using the Flash Modes, P-TTL auto flash P-TTL, Auto flash A, Manual flash M - af540fgz

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Using the Flash Modes The AF540FGZ has the following flash modes. Select the mode best suited for the subject. Before photographing, confirm the following. 1. Whether your camera supports the desired flash mode. ➝ Cameras that Support Each Flash Mode (page 60) 2. Whether you can use the desired function with the combination of your camera and the flash mode you have set. ➝ Functions Related to Each Flash Mode (page 64 - 71) P-TTL auto flash (P-TTL) A pre-flash is discharged before the main flash so that the multi-segment metering sensor can measure the subject's distance, brightness, brightness difference, backlit condition, etc. The data obtained is incorporated to set the output of the main flash. This mode obtains more accurate results than with the conventional TTL mode. Refer to page 26 for instructions on how to use this flash mode. TTL auto flash (TTL) Based on the amount of light reflected off the film of the camera, the camera adjusts the flash output automatically to obtain a correct exposure. Refer to page 27 for instructions on how to use this flash mode. Auto flash (A) The built-in flash metering sensor adjusts the flash output automatically. Use with cameras that are not PTTL or TTL Auto flash compatible. Refer to page 28 for instructions on how to use this flash mode. Manual flash (M) When the camera is set to manual exposure, manual flash can be set to suit the subject distance and aperture. The manual flash output can be set to 1/1, 1/2, 1/4, 1/8, 1/16, 1/32, or 1/64. Refer to page 30 for instructions on how to use this flash mode. 25

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25
Using the Flash Modes
The AF540FGZ has the following flash modes. Select
the mode best suited for the subject.
Before photographing, confirm the following.
1. Whether your camera supports the desired flash
mode.
➝
Cameras that Support Each Flash Mode
(page 60)
2. Whether you can use the desired function with
the combination of your camera and the flash
mode you have set.
➝
Functions Related to Each Flash Mode
(page 64 - 71)
P-TTL auto flash (P-TTL)
A pre-flash is discharged before the main flash so that
the multi-segment metering sensor can measure the
subject's distance, brightness, brightness difference,
backlit condition, etc. The data obtained is incorporated
to set the output of the main flash. This mode obtains
more accurate results than with the conventional TTL
mode. Refer to page 26 for instructions on how to use
this flash mode.
TTL auto flash (TTL)
Based on the amount of light reflected off the film of the
camera, the camera adjusts the flash output
automatically to obtain a correct exposure. Refer to
page 27 for instructions on how to use this flash mode.
Auto flash (A)
The built-in flash metering sensor adjusts the flash
output automatically. Use with cameras that are not P-
TTL or TTL Auto flash compatible. Refer to page 28 for
instructions on how to use this flash mode.
Manual flash (M)
When the camera is set to manual exposure, manual
flash can be set to suit the subject distance and
aperture. The manual flash output can be set to 1/1,
1/2, 1/4, 1/8, 1/16, 1/32, or 1/64. Refer to page 30 for
instructions on how to use this flash mode.