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What is cause of internal flash on 60D not functioning?

Speedlight Ratio Question -

 From the 550EX users manual I understand how to adjust the ratio between slave speedlights with the master turned off, but how do you adjust the ratio between the master which is turned on and a slave?

Speedlite 600 ex-rt flashes rapidly & then camera won't focus

What causes a speedlite to fire rapidly, almost like a strobe light, while on top of the camera angled at the ceiling? Afterwards, it take a bit for my camera to do anything (Mark ii 5D)...won't focus or anything, like it's thinking or something. It ...

600EX-RT and ST-E3-RT Failed

I was at a wedding shoot last weekend and my (3) 600EX-RT and ST-E3-RT worked great until I got into the reception hall/tent.  Could not get the flashes to fire via radio.  Had to resort to on camera flash for the entire reception.  The next day I tr...

I cannot get high speed sync to work

Hi all,  I have an EOS 6D and a Speedlite 580exii. For the life of my I cannot get the high speed sync to work. At anything past the shutter sync speed I get a black bar despite the fact I have enabled the high speed sync mode. I should also note I a...

where do i find the serial numbers on the speedlites?

I have long since thrown out boxes for my 580 exII speedlite. Where do I find the serial number on the unit?

Speedlite 580EX II in E-TTL mode flashes after shutter close on EOS 550D

Hello everyone, I'm having a weird problem with a Speedlite 580EX II I recently bought used. When setting the flash to E-TTL2 mode, it seems that the flash goes off after the shutter has closed - at least that's what I assume happens because when I t...

Flash Exposure Inconsistent

I'm using 580EX flash units on my Mk4 cameras with a 24-70 f/2.8 or the 17-35 f/2.8, mostly bouncing slightly with a dome on the flash. Fresh high output batteries or a high-power external source is the power.  The exposure is varying from frame to f...

My 580EX II only exposes correctly in bounce mode :-0

I noticed that my speedlight underexposes (by at least 2 stops) in the normal flash head configuration.  Once I place any kind of an upward bounce on the strobe, I get a correct exposure.  It exposes correctly in the left/right bounce configuration. ...

E-TTL on 6D+600EX-RT

Hi Everyone,         my current setup is the 6D (24-105 F4) and the 600EX-RT speedlight. the issue i'm having is with the E-TTL exposure.          yesterday i noticed that any subject further than 10feet gets under-exposed (this is indoor testing). B...

canon st-e3-rt slave readly light goes on and off

The ready symbol of the lighting bolt on my transmitter that indicates the flashes are recycled and ready go on and then go off again randomly. I have 4 flash slave units and one out of every 4 photos, all the flashes fire. New eneloop charged batter...

Flash Help!!!

New member here, I have a Canon 7D and mainly shoot automotive photography. I am looking to get into buying a flash (or two) but have no clue where to start. I want them to be off camera fired flashes, so do I need pocket wizards? or is there an alte...

600EX-RT and Hi Speed Sync with 5D MKIII.

I'm reading conflicting comments on use of hi speed sync with the 600EX-RT and aperture priority.  Will the MKIII do so?  Or do I need to go to manual?  Also, will the ST-E3-RT transmitter allow hi speed sync with MKIII in aperture priority and the 6...

How I can manage the 430 EX II and 600 EX RTes but came to find out the 430.

How I can manage the 430 EX II and 600 EX RT wireless without the ST E3 transmitter? I want to retain the ETTL features but came to find out the 430 work different to the 600 when it comes to wireless functionality. Using 5DM III

What thread size is the mounting bracket socket on the 600EX-RT?

What thread size is the mounting bracket socket on the 600EX-RT?  The manual shows the SB-E2 bracket but apparently it is not available.