Manual Low Guide Number Adjustment - Canon SPEEDLITE 540EZ Service Manual

Hide thumbs Also See for SPEEDLITE 540EZ:

Table of Contents

Part 3: Repair Information

Seeernneced

(ey Neyile}X}

* The Flash Meter is used to measure the guide number. However,

3.5 Manual Low guide number adjustment

To adjust the flash intensity (guide number) in the manual flash mode (Lo-1/4).

c-no. = 16.8 + 0.5 Faso: 100)

measurement can be carried out with the multi-camera tester if

the Flash Meter is not available.

This adjustment must be carried out in a darkroom.

Lean

oe ea)

<Tools>

* Light Meter (Flash Meter)

¢ Standard Reflector

¢ Multi-camera Tester (EF8000/5000/500)

(1) Adjusting by the Flash Meter

1. Set the flash to ZOOM position: 35mm, and flash mode: M Lo 1/4.

2. Set the Flash Meter in front of the standard reflector.

3. Light the flash at a distance of 2.1m, and read the F value of the Flash

Meter.

4. Adjust VR5 so that the F value of at this time is 8.0 + 0.5F.

G-No = 16.8 + (distance) 2.1 m=

F8.0

(2) Adjusting by the Multi-camera Tester

1. Set the multi-camera tester as follows, and cover the light source with

black paper, etc.

ISO: 100, K: 12.5, EV: 6

2. In the manual mode, set the camera aperture to {/8.0, and the shutter

speed to 1/60.

3. Set the multi-camera tester sensor on the camera (with 540EZ attached),

and shoot the standard reflector from a distance of 2.1m.

4. Adjust VR5 so that the multi-camera tester readout at this time is OL0.5F.

3-18

Table of Contents