Canon 2478A002 manual Taking the picture and flash confirmation, AF-assist beam

Basic Wireless E-TTI. Autoflash O ~ e r a t i o n

(5)Taking the picture and flash confirmation

W h e n y o u p r e s s t h e s h u t t e r b u t - t o n c o n ~ p l e t e l ya, w i r r l c s s s i g n a l i s t r a n s m i t t e d t o t h e s l a v e , t h e n t h e s l a v e f i r e s a p r e f l a s h a n d t h e n t h e m a i n f l a s h w h e n t h e p i c t u r e is

t a k e n .

The subject's flash cxposurc reading is obtained with t h e preflash a n d used to s e t t h e main flash output . Wireless flash photography is there- by executed with a n optimum flash ou1put.

When t h e correct flash exposure is obtained, t h e ST-E2's flash confir- mation lamp lights for about 3 sec. immediately after the flash fires. If i t does not light, the picture might be underexposed. In this case, use a larger a p e r t u r e or place the slave

closer to t h e s u b j e c t a n d r e p e a t steps (2)to ( 5 ) .

With the EOS-3, the model- B Ing, 'flash can be fired to see t h e lighting effects before t h e p i c l u r e i s t a k e n . S e e

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The slave must be properly positioned to receive t h e wireless transmission.

After t h e picture is t a k e n . the slave's operation result is displayed on t h e slave's display panel.

I f t h e s l a v e i s in t h e S E (Save Energy) mode, press- ing t h e ST-E2's t e s t t r a n s - mission button will cancel it. When you press t h e shutter button halfway and activate t h e c a m e r a ' s e x p o s u r e meter, the ST-E2 cannot be used to cancel the slave's SF: mode o r to e x e c u t e a t e s t transmission. The camera's exposure m e t e r m u s t t u r n off (viewfinder's exposure s e t t i n g d i s p l a y t u r n s off) before t h e S E mode can be canceled or a test transmis- sion executed.

AF-assist beam

U n d e r low-light o r low - contrast c o n d i t i o n s , t h e ST-E2's A F - a s s i s t b e a m is e m i t t e d t o a s s i s t a u t o f o c u s i n g . The A F - a s s i s t b e a m i s c o m p a t i b l e w i t h t h e EOS-3's A r e a AF . T h e AF - assist b e a m ' s effective r a n g e is a b o u t

0.6m e t e r t o 10 m e t e r s a t t h e c e n t e r a n d 0 . 6 m e t e r t o 5 m e t e r s a l o n g t h e p e r i p h e r y .

The ST-E2's AF-assist bran> c a n he e m i t t e d only while t h e ST-E:! is attached to the EOS-3. In the case of EOS c a m e r a s with a built -in AF- assist beam emitter, the beam will

be emitted by the camera.

The slave's AF-assist beam is not emitted (except when t h e flash is ready).

44 To prevent overheating, limit t h e n u m b e r of consecutive wireless transmissions to 50. After 50 consecutive wireless transmissions, allow the ST-EP to rest for 10 minutes.

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