SOURCE: Sunpak 522 and 544 always firing full power
The probable cause of such behavior is a faulty quench capacitor. The part is specially manufactured to withstand rather high voltage (350 V) and large current peaks (300 A) - despite of its small dimensions - and often goes wrong. Replace it with a capacitor cannibalized from a cheap second-hand shoe-mount flash having the same feature (series thyristor circuitry) and as high guide number as available. Both Sunpak units are highly populated inside, only try to repair them if you have a certain skills in such a job. If any of these explanations is unfamiliar for you then leave the flash alone and take it to a repair shop - there is lethal voltage inside, even long after the unit has been switched off. Good luck! Laszlo (kalaci at index dot hu)
SOURCE: Sunpak 2000 DZ
see if this helps:
http://www.flickr.com/groups/400d/discuss/72157603805472662/
SOURCE: canon I use the Canon XTi and sunpak 544
The Rebel XTi has a sophisticated communication protocol between the camera and a dedicated flash. Only ETTL-II capable flashes can benefit from all the features the engineers at Canon thougt out. This means that with the otherwise superb Sunpak you won't be able to emit autofocus assist pulses, red-eye reduction pulses, the camera won't increase or reduce the flash intensity for bracketing, zoom lens settings won't be reflecting on the flash illumination angle, and so on. But! Set your Canon to full manual (125th sec), set Sunpak to auto, take one of the working apertures according to your taste (depth of field, etc.) and set the same aperture on the camera, and shoot. You still can use bounce flash. I am not sure about second curtain flash, I suspect it won't be possible. Both tele kit and milky filter in front of the flash head are of great help, you don't need to worry about the differences these make in flash intensity. Always keep in mind that the flash makes good exposure according to the given working aperture and, as long as you set the same aperture on the camera, the subject will be correctly illuminated. (I have a Sunpak 522 and a 455 and employ them this way, with success, on my XSi.) Of course you can set set the flash in full manual (M/PR/MD), using the left side, set knob and calculator dial, and this is the only way if you want to make series of shots, because the flash can only make bursts if the power is reduced to at least 1/16th. Good light, Laszlo
SOURCE: Canon Macro Settings for 100mm lens and Sunpak 12R ring flash
Firstly, be sure to check flash voltage. Your 30D may accept max 6V so that your camera can be shot if the flash unit has higher voltage than 6V.
1. Use low ISO to keep low noise....around f/8 or more depends on your need and how much DOF you want.....Set the shutter speed around 1/125 to your max speed to stop any movement (your subject or camera itself shaking).
2. Above is set in Manual mode (iso100, f/8 1/125 or 1/250), then you just need to leave the flash to work in TTL mode.
3. It needs battery, the connection is for syncing to trigger and release a proper flash power (in TTL mode).
Hope this help!
SOURCE: how can i hook my sunpak 544 to my rebel xti
All photo shops hold "hotshoe to PC" adapters for a few bucks. This solves your problem, supposed you have the hosehold-to-PC cable that comes with the 544 as accessory. If not, such cable can be obtained at better photo shops or from www.paramountcords.com. You must know that the flash can be used together with your camera only in Aperture Priority or Manual mode (flash set to auto), or as a fill flash (flash set to Power Ratio mode). The 544 has safe sync voltage.
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