Question on single Speedlight off camera

[Sime]

And, adding to the above - I looked at Pocket Wizards (Used them etc) Brilliant, but thought that the Alien Bee triggers were a lot better value for money. I use a sender and two receivers and have not had one little fault with them. Highly recommended (manual, not ettl)

[Skoropada]

Maybe I'm missing something, but aren't there some optical devices that can be triggered by the onboard flash?

I think I read about that beeing used with a bridge camera.

I believe those are cheaper and can handle many flashes at the same time.

If I'm wrong, please, correct me.

[PhotoNewt]

Originally Posted by Sime™

And, adding to the above - I looked at Pocket Wizards (Used them etc) Brilliant, but thought that the Alien Bee triggers were a lot better value for money. I use a sender and two receivers and have not had one little fault with them. Highly recommended (manual, not ettl)

Seems like a more reasonable alternative for us hobbyists. What brand of flash do you use them with?

Originally Posted by Skoropada

Maybe I'm missing something, but aren't there some optical devices that can be triggered by the onboard flash?...I believe those are cheaper and can handle many flashes at the same time...

No you are not missing anything; cheap add-on optical flash triggers exist but are not free of problems either. There are many different ways to trigger your off-camera flashes, which one is better for you depends on a number of variables including your photgraphic purpose (professional vs. amateur), intended environment (indoors vs. outdoors), flash distance/configuration and of course, available budget.

All avaialble options differ in terms of cost, reliability and flexibility, I don't believe anyone in particular is the ideal solution but a compromise.

[kencaleno]

Originally Posted by Axis

Hello all,
I'm very new to photography and have a Canon eos 40D with a single 580ex II. I've scoured the two manuals and have been searching the net and have only gotten myself confused.
Is there a way to use the 580 off camera by using the built in flash to trigger it? The manual only talks about multiple speedlights, and everywhere I look online I'm finding people mentioning trigger units and pocket wizards and a bunch of other stuff that went right over my head.
A couple weeks ago I read an article ( I thought it was a post here at DPS but for the life of me I can find it again) where someone was describing how they turned down the built in camera flash so it didn't light the subject, but used it to trigger the off camera speedlight. Is this possible on the 40D with the 580ex, and if so is there any chance someone would be willing to lead a newbie through the procedure?
If this isn't possible, what is the simplest way to use a single off camera flash?
Any help would be greatly appreciated.

Simples way is to use a PC (Prontor/Compur)cord with an adapter that fits hot shoe-I use a 5 meter one.AS for modus operandi:

Balancing the light between existing light and flash is quite simple- Just remember that Shutter-speed controls existing light and Aperture controls the flash effect. You set your camera’s mode to Av (aperture priority) selecting aperture to desired depth of field. (ie: for weddings F8 does the job) Get a reading from subject. Take note of these settings. Now select M (manual) mode and use the settings you got from Av mode. Fit your flash to hot shoe, use manual flash. Try first maximum sync speed (usually 1/250 sec or 1/500 sec), then come down from here just adjusting shutter speed, and checking on monitor, until ambient light looks right. As for power setting, I like to start at ¼ power, then I can go down two stops to 1/8 and 1/16 power, and up to ½ and full power. (My flashguns only span from full to 1/16 power) For interior shots use the same method: If ambient light reads 1/125 @ F4, you will need to set aperture to F4, and set shutter speed at 1/500(if this is your camera’s maximum sync speed, or 1/250 @ F5.6 if that is your maximum sync speed, and bounce off ceiling. Adjust power of flash until it looks right in the monitor. This gives a ratio of 3:1 as a basic starting point. A big advantage, especially when photographing people, is to have the flash off-camera, so wherever you wander to get different angles, your lighting with remain constant. If flash is on camera, you would need to make adjustments each time you move out of the pre-set range of focus. Your flash can be triggered by radio transceivers (Pocket-wizards) or by means of pc cables. For wraparound, or cross- lighting, you could place your subject between the sun and your off -camera flash, using the sun as fill and your flash as the main, or key, light
Ideally, indoor images should not show that flash was used, so for this to take place, modification is required. I use a black computer mouse-mat, which forms a half snoot and is rubber banded to the underside of my flashgun when bouncing off of ceilings etc., this ensures no direct light lands on the subject. You can choose of course, to use automatic mode for flash-or TTL, (Through The Lens) I just prefer the manual mode.
Problems occur when using flash under fluorescent illumination, where you will get a severe green cast over your images-Solution is to use a gel (Window green) over the flash window, and a magenta filter( FL-D) over the lens. These filters will lose you one stop of light, but the lens filter alone will do the trick, if you aren’t using flash. Why this works is green over the flash window equalizes foreground and background color temperature, and the magenta on the lens absorbs the green from both sources to neutralize the image.
Most cameras will let you select front or rear curtain flash set-ups, (Front curtain flash fires as soon as the shutter opens, while Rear (or second) curtain flash fires just before shutter closes) and for most types of photography Front curtain will do the job, If the subject is on the move however, Rear, (Second) curtain flash is the way to go, the reason being that if you were to use front curtain flash on a moving subject, the movement defining blur, especially against a black, or at least a dark background, would appear in front, and not behind the subject, giving the impression that the subject is going backwards. On the other hand, if you were to use rear-(second) curtain flash for say a portrait, and you are trying to capture a certain mannerism, you would not want the flash to fire too late and miss the emotion.

If you shoot at a party or wedding reception, indoors at night using the auto or programme flash setting, which is usually either 1/250 or 1/500 second, you will end up with ultra black backgrounds, and not the scene you saw. That is because the flash fired too fast to record background detail. Solution: set camera to shutter priority or manual mode, and adjust speed to between 1/30 and 1/8 second-these are normal settings for fairly dark conditions, because of the actual flash speed,. blur won’t be a problem. This is Known as “Dragging the shutter”.
When using Dragging method keep flash set to auto or ttl, as, unless you are comfortable with doing this , you could complicate matters. If you only have a point and shoot camera, use the night setting-the camera will automatically set shutter speed to allow background detail to be captured, BUT, you will need a tripod/monopod etc, as for night mode shutter speeds are likely to be a lot slower than 1/8second.

Flash doesn’t reach as far as you like? Up the ISO! -“Twice the distance, four times the speed”. For instance: If your flash has a Guide number (GN) of 25(metres (80 ft), the best you can expect is a realistic distance reach of 20 metres (60 feet) at Iso 100,so at Iso 400 you will get a realistic reach of 120 feet (40 metres),and at 1600 Iso, a reach of 240 feet (theoretically),but noise will play its part at high Iso’s.
If you are using an automatic flashgun, that does not give you fill-in values, just double the iso you are using. Meter the scene, select an f-stop for the DOF you want,set auto flashgun aperture to same f-stop, and take your shot,this will give a 2:1 ration-your fill will be 1 stop darker that the main subject.
Hope this helps-Regards, Ken