Question about Canon Speedlite 420EX TTL Flash

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420 ex does not sync with the shutter, pre flash only

Flash not sync with shutter. Began intermittent problem, now not working at all. I get a pre flash, but that is all. The buil in flash works ok. Is the problem the flash or the camera ?

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I have the same issue with a speedlite 380EX and a EOS50D. what did you finally do ?

Posted on Feb 15, 2010

  • cosmin_balto
    cosmin_balto Jun 13, 2012

    For 4 day I have the same problem too. My 420 EX II does not sync with mu Canon 7D. Any idea?

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Pentax K110d flash trigger problem, I have 2 flash trigger strobes set up and a flash on the hot shoe of the camera, but with shutter release the trigger strobe lights fire but do not show in the pic, only...


Your camera uses a PTTL flash system. That means the flash on the camera fires a "pre-flash" to set the exposure and then the main flash. Your flash trigger strobes are reacting to the pre-flash and firing before the shutter activates. This all happens in a millisecond.

Oct 25, 2010 | Pentax K110D Digital Camera

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I purchasing this flash from b & h and want to know if it will sync with my studio lights slave function so both flashes will be fired at the same time? I figure I'll have to use the camera in manual...


Presuming you bought a shoe-mount flash for your Sony A900 and set the camera and flash to manual so there's no pre-flash to prematurely trigger your strobes, and presuming your studio lights have built-in optical slaves, you should be all set.

Henry Posner
B&H Photo-Video

Oct 10, 2010 | Cameras

1 Answer

Can I use it wirelessly with a canon EOS 40D


Yes you can but it won't TTL and you will need to fire it from or with a slave/light cell. This will make your system more like a studio set up. You will need to increase/decrease the light intensity using different modifiers for special effects. My portable/location set up uses 2 Vivitar 283's, a Canon 533G, Nikon SB 15 and a Canon 420 EX all fired from little flash slaves. here is an e-Bay reference link

http://cgi.ebay.ca/Flash-Slave-Trigger-Hot-Shoe-Sync-Adapter-Sensor-US-/110405132832?pt=LH_DefaultDomain_0&hash=item19b4a8a220

Hope this was a help

May 19, 2010 | Canon Speedlite 540EZ TTL Flash

1 Answer

Ttl auto does not work


Digital Camera Fully Compatible, Newly Developed S-TTL System "S-TTL" enables TTL auto shooting by an external strobe for a digital SLR camera as well as for a point & shoot digital camera.
INON S-TTL auto strobe supports any manufactures' model providing highly accurate exposure control.
Film camera era without strobe selection problem TTL stands for "Through The Lens" and TTL auto strobe system controls flash amount to provide correct exposure based on calculation by camera's internal sensor metering reflecting strobe light from a subject through the lens. This TTL system meters actual light amount reflecting from a subject providing accurate exposure.
When we start with the history of underwater TTL auto strobe, underwater camera?"NIKONOS V" released in 1984 was the first to provide automatic TTL flash control for underwater strobe SB-102, SB-103 succeeded by NIKONOS V compatible underwater strobes form other manufactures. The 5 pin electrical sync connector for NIKONOS V is most popular and widely adopted to connect an underwater strobe and underwater film camera (underwater camera/housing).
A film SLR camera has flexibility to select an underwater strobe. As far as housing has NIKONOS type electrical sync connector and properly wired, automatic TTL flash control is usable with any TTL auto strobe like Nikon SB-105, INON Z-220, Z-22 connected via electrical sync cable.
NIKONOS type 5 pin electrical sync connector and NIKONOS V with INON Z-22 strobe
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Film camera compatible strobe is not usable for a digital camera!? Underwater TTL strobe circumstances have been drastically altered with the spread of digital camera among divers. Some underwater housing for digital SLR camera has NIKONOS type electrical 5 pin sync connector as same as film camera housing. Since the housing has same NIKONOS type sync connector, existing film camera compatible underwater strobe has been considered compatible with a digital SLR camera via 5 pin sync cable but happened to experience error message on the digital camera or blackout on an image even the strobe worked. Why this happened?
This is because automatic TTL strobe system difference between a film camera and a digital camera.

The film TTL auto system makes single flash while digital TTL auto system employs pre-flash type making two to three flashes. Film TTL auto strobe system starts firing at the same time the shutter opens and reflecting strobe light from a subject is recived at a film. The reflecting light on the film is metered by the sensor to determine when to cease firing for correct exposure. This process takes only about 1/1000 second.
In contrast, digital TTL auto strobe system can not calculate adequate exposure based on reflecting light from a subject since image sensor (CCD/CMOS) reflectivity is comparably low comparing to a film. So digital TTL strobe system gives preliminary flash for very short period of time (pre-flash) just before the shutter opens metering reflecting light from a subject by the sensor to calculate necessary amount of light for correct exposure and starts emitting main flash at the same time the shutter opens. Canon E-TTL and Nikon i-TTL employs this system.

When we connect conventional film camera compatible TTL strobe to pre-flash type digital SLR via sync cable, the strobe makes full dump by pre-flash signal then the shutter opens before the strobe has been fully charged resulting in quite under exposed image only with ambient light. Even two time flash compatible strobe like INON Z-220 strobe, does not fully support a digital TTL and force to use Manual flash mode.





Film SLR:
A strobe starts firing at the same time the shutter opens and quenches firing when correct exposure has been obtained.
A film compatible TTL strobe connected to a pre-flash type digital SLR via electrical cable flashes does not support TTL auto exposure resulting in synchronization only with first pre-flash or totally uncontrollable.
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The birth of digital fully compatible S-TTL S-TTL auto compatible INON D-2000 strobe and Z-240 strobe works in TTL auto mode by simply setting their main dial to S-TTL position. A film camera seems to depend more on photographer's skill, experience and feel since the camera does not allow checking images on site. A digital camera allows us to check images right after shooting and enable to try to shoot again as much as we like. And high capacity memory card further allows to shoot hundreds of images. The digital camera makes entry level of underwater photography getting down and nowadays more people buy a digital SLR camera and underwater housing even they have just started underwater photography. However underwater photography gets more difficult because underwater strobe does not work in TTL auto.
INON is among the first to support digital TTL auto system with "S-TTL" auto mode equipped D-2000 strobe and Z-240 strobe.
The proper name of S-TTL is "Optical Synch TTL". S-TTL enables to perform in TTL auto exposure as same as genuine TTL strobe from camera manufacture, based on camera's built-in flash light to use as a signal to be transmitted to a strobe. S-TTL uses digital camera's built-in flash light not as a light source but as like a controller to trigger S-TTL strobe.
The built-in flash of a digital camera makes weak flash (pre-flash) before main-flash to calculate exposure. This pre-flash is transmitted to S-TTL strobe to control the strobe to make pre-flash to a subject. The reflecting light from the subject goes through the camera's master lens to an image sensor then a processor calculates main flash light amount for correct exposure.?Finally the built-in flash makes main-flash which is transmitted to the S-TTL strobe to cause main-flash of the S-TTL strobe.


Digital camera's built-in flash lights are transmitted via an optical fiber to the
S-TTL strobe to make pre-flash and main-flash instead of the built-in flash.
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Apr 30, 2010 | Olympus FL-20 TTL Flash

1 Answer

Sb800 firing without pressing shutter release


sounds like a short in one of the circuit boards, most likely one or seveal of the ribbons and boards will need to be replaced to correct the problem. Send in for repair expect to pay up to $200 for a Nikon factory overhaul

Feb 21, 2010 | Nikon Speedlight SB-800 TTL Flash

1 Answer

580EX speedlite not firing


Does the pilot lamp light up? If so can you fire it manually by pressing on it? If the batteries are low it may simply just be taking a while to charge, the camera will not wait for it to be ready to fire and it may seem to be not working. If your flash can be fired manually however, there may be a problem with the cameras shutter or the hotshoe. You can do a basic check by pressing the star button at the rear of the camera, you should get a pre-flash. If not, there is a problem with the cameras hotshoe which you will need addressed by a service centre. If you get a preflash you can next check the cameras shutter by setting the second curtain to sync with the flash. This can be done via the cameras "Custom Function" menu, c-Fn 15. Set the camera to TV mode and chose a 1 second exposure. Take a shot with the flash attached, if the shutter is working correctly, the flash should fire a pre-flash and then a main flash. If it doesnt, the switch inside the shutter is broken and the shutter needs to be replaced. This is a pretty labour intensive repair and you may consider an upgrade as more economical.

Apr 14, 2009 | Canon SPEEDLITE 580EX TTL Flash

1 Answer

Flash doesn't synch with shutter on olympus e-420


Well a good photographer dosen't  use a auto to much.  Second you can solve  this problem by  buying a 36r or 50 r  flash.  Next put your camera into aperture priorty the flash will now sync up to 4000. I hope this solves your problem..  lesmobile1@yahoo.com    www.storyboardvideo.com

Feb 28, 2009 | Olympus EVOLT E-500 Digital Camera

1 Answer

The flash pictures are only half exposed, like drag on shutter


Sounds like the shutter needs repair. Either the opening curtain is sticking or the closing curtain is not holding long enough. Another problem might be the camera's sync speed might be lower than 1/125 of a second. Many cameras use 1/60th or 1/90th of a second as their flash sync speed.

Feb 02, 2009 | Ricoh KR-5 SUPER II 35mm SLR Camera

1 Answer

Cannot get to work right either TTL or as wireless remote


This one got me too. I assumed it wouldn't need the built-in flash if it was a wireless remote. I still want to know why this is is so. If it needs a pre-flash to set exposure, surely it can pre-flash with the remote SB600?

Nov 29, 2007 | Nikon Speedlight SB-600 TTL Flash

2 Answers

Maximum flash sync


I have a 3000z, and have not noticed any problem with flash sync with even the fastest speed.

Sep 13, 2005 | Epson PhotoPC 3100Z Digital Camera

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