Go Back   Steve's Digicams Forums > Digicam Help > General Discussion

Reply
 
Thread Tools Search this Thread
Old Jan 21, 2003, 1:19 PM   #1
Junior Member
 
Join Date: Dec 2002
Posts: 18
Default Canon 420EX Flash Will Not FIre In Continuous Mode on G3

Canon G3 in PROGRAM mode. The 420EX flash works in single exposure mode, but, when I switch to CONTINUOUS, the 420EX never fires. In fact the lightening bolt on the rear LCD screen goes out as soon as the flash is put on the hot shoe (I had the flash set to always fire).

I called Canon tech support. He said that his does the same thing. The 420EX or the 550EX would not fire when the camera was placed in CONTINUOUS mode.

If I remove the 420EX from the hot shoe. The built-in flash works properly in CONTINUOUS mode - taking a picture whenever the flash charges up.

The problem is the internal flash is too weak because my subject is about 20 feet away.

We have a deer feeder in our back yard. My wife wants pictures of the deer at her feeder.

I bought a motion activated outside light at Wal-Mart for $8.95. I got a 12 volt solenoid from Jameco for $8.95. When motion is detected, the solenoid presses the camera button and holds it down as long as motion is detected.

I set up the G3 on a tripod in the garage. I opened the window and removed the screen so the camera had an excellent view of the feeder. I turned off the AUTO POWER-OFF feature, and, set it to manual focus on infinity.

I had it set up for several hours. When I checked it, it took a total of 4 pictures. They were all great shots of my wife filling up the feeder. It worked perfectly!

But, I need more flash power because the deer only come at night.
Ron@gbg1.com is offline   Reply With Quote
Sponsored Links
Old Jan 21, 2003, 2:51 PM   #2
Senior Member
 
Join Date: Aug 2002
Posts: 2,162
Default

I'm not a Canon owner, but I think you might be asking the impossible. When you take a flash picture, a lot of energy has to get sucked out of your cam battery to recharge the flash and this takes time. Less time if you have a big (by BIG I mean batts as well) external flash like the Metzes.

So the cam maker says, why allow continuous flash mode, when all the cam will do is fire the first flash, then give you black frames whilst its charging up!. The greater the distance from the internal flash, the bigger the flash, the longer it will take to charge up.

I'm surprised yours appears to work! But what good are pictures at the rate determined by the flash re-charging time? I'm sure there are people here using expensive synchro cams and flash units that have done this, but here's a few ideas.

For any flash to fire repeatedly, it needs to charge quick. Reducing the flash light output level can do this, and connecting it to the same voltage bigger capacity batts (providing the flash electronics hold up and don't pop).

So, if you're sure the cam is firing the internal flash in continuous mode (which surprises me), reduce its output in the cams menu to lowest, possible. Then use a slave unit to fire your external flash set up near your deer feeder. This way you get the light nearer to the subject where you want it, even though the cam might be further away. The flash recharge problem will still be there on the slave unit, so tell the gun you're shooting close to reduce intensity and it will re-charge quicker

If you like adventure: let's say your remote slave flash uses 4 AA cells. If it uses less it's not much use. That's 6 volts. Try wiring it up to a bigger capacity 6 volt dc power source e.g lead acid. The flashes will fly, but the gun might fry! That's the risk.

PS I'm curious about how the deer find this barrage of flashes - do they come back? Good luck - VOX
voxmagna is offline   Reply With Quote
Old Jan 21, 2003, 3:26 PM   #3
Junior Member
 
Join Date: Dec 2002
Posts: 18
Default Canon 420EX Flash Will Not FIre In Continuous Mode on G3

>When you take a flash picture, a lot of energy has to get sucked >out of your cam battery to recharge the flash and this takes time.

I am using the AC cord that came with the G3, so, that is not a problem.

>So the cam maker says, why allow continuous flash mode, when >all the cam will do is fire the first flash, then give you black >frames whilst its charging up!.

When I removed the accesory flash, it did just what I want using the internal flash, that is, it took a picture around every 3 seconds, or so. That is even better for my application than 'continuous'.

>Then use a slave unit to fire your external flash set up near your >deer feeder. This way you get the light nearer to the subject >where you want it, even though the cam might be further away.

I think that a slave unit is the answer. The 420EX has enough output that it could be very close to the camera and still get enough light on the subject. Too bad that it doesn't work from an AC cord, though.


>I'm curious about how the deer find this barrage of flashes - do >they come back?

I found that wild birds totally ignore a camera flash. They probably think that it is just ligtning. Also, I heard that if you shine a spotlight on a deer, they just freeze.
Ron@gbg1.com is offline   Reply With Quote
Old Jan 21, 2003, 3:53 PM   #4
Senior Member
 
Join Date: Aug 2002
Posts: 2,162
Default

I hope some of the things I wrote helped. Incidentally:

Quote:
I am using the AC cord that came with the G3, so, that is not a problem.
The AC power unit is not able to supply the sort of peak currents in short times I was referring to. An analagy is you car (sorry auto). Your battery charger can charge the battery, but it won't start the car if the battery's flat!
voxmagna is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 5:51 PM.