P-TTL Test Images
Live View vs. View Finder
The exposure is the same whether one uses the view finder or live view as illustrated below.
Setup:
- Pentax K-3 in P exposure mode
- Unprocessed JPGs (except for scaling)
- Autofocus with center and edge focus points, respectively
- smc Pentax-FA 50mm F1.4 lens
- AF 360 FGZ II flash mounted on camera
- Direct flash, zoom head at 48 mm matching the lenses
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| Live View FA50 | View Finder FA50 |
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The Pentax K-3 uses the built-in light meter for the P-TTL measurement also in live view mode, which results in some additional delay from shutter button press to the flash firing as compared to shooting in view finder mode.
When shooting in P-TTL mode in live view the shutter closes, the mirror flips down and the pre-flash fires and gets analyzed by the light meter. The mirror flips back up, the shutter opens and exposes the sensor, the flash fires, the shutter closes and reopens for live view.
