Olympus E-3 User Guide

53
FP Flash Emission
0
0.2
0.4
0.6
0.8
1
1.2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Time (ms)
Output level (% x100)
with the period needed to move the narrow slit between the first
and second curtain of a focal plane shutter entirely across the
frame, then we could ensure even exposure for all sections of the
sensor. Aha! This is exactly what an FP capable flash unit does.
If we consider the output graph of an FP enabled flash unit then
it would look like this:
In order to maintain the peak level of illumination, the stored
charge in the capacitor is released in a series of pulses. This
means that each “burst” of light is a fraction of the power of the
“full dump” – thus providing a lower level of light overall. This is
why FP mode flash exposure distances are considerably shorter
than those of normal emissions.
This is not really a problem, however, as most of the time one
would be using FP mode for fill-flash operations in bright sunlight
when shooting close-up portraits. The range of an FP unit’s
emission is comfortably within the normal portrait photography
camera-to-subject distance ranges. In addition, the Olympus FL-
36/50 flash units constantly provide an available range read out
on their display panels so all that is needed is a glance at the
information display to check that you are within range.
GUIDE NUMBER vs. DISTANCE (MANUAL EXPOSURE)
The distance at which one may normally (i.e. non FP mode)
shoot with flash is governed by the equation

Olympus E-3 Specifications

General

Megapixel	10.1 MP
Sensor type	CMOS
Image stabilizer	Yes
Image sensor size	4/3 \
Supported aspect ratios	4:3
Maximum image resolution	3648 x 2736 pixels
Digital zoom	0 x
Optical zoom	5 x
Interface	USB
Power source	BLM-1
Video capability	No
Camera shutter speed	1/8000 - 60 s
Display diagonal	2.5 \
Magnification	1.15 x
Product color	Black
Image editing	resizing, rotating
Photo effects	black&white, Sepia
White balance	auto, Cloudy, custom modes, daylight, Fluorescent, Tungsten
Camera playback	Slide show
Storage temperature (T-T)	-20 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	10 - 90 %
Operating relative humidity (H-H)	30 - 90 %
Compatible memory cards	xd
Light metering	centre-weighted, spot
Light exposure modes	aperture priority AE, auto, manual, shutter priority AE

Weight and Dimensions

Depth	74.5 mm
Width	142.5 mm
Height	116.5 mm
Weight	810 g