I have recently acquired the subject flash for my Canon Rebel XTi. I read the reviews prior purchasing and it seems to be a good fit for what I wanted.
The camera fires the flash but the AUTO Check lamp never comes ON. I also cannot see any difference between the pictures taken with the in-camera flash and the Sunpak for the same exposure and focal lengths settings: shouldn't, the more powerful Sunpak flash provide faster shutter speeds at the same aperture and focal length settings?
Don't know why the Auto Check light isn't giving you a blink OK.
Do you get the flash ready light in the camera's viewfinder when the PF30X is cycled and ready to fire? Maybe it's not fully seated in the hotshoe, faulty connection in the hotshoe may prevent it from fully communicating with the camera.
At the same exposure and focal length settings with direct flash there shouldn't be any difference between the built-in and the hotshoe flash. Maybe less "red-eye" since the PF30X flash head is a bit farther from the lens than is the built-in. Where you benefit from the PF30X is in it's greater power for more distant subjects or using smaller apertures (larger f-number) for greater depth of field. The greater power also enables it to be used for more flattering bounce flash, and its patterned near-infrared AF Assist light should be more effective and less annoying to your subjects than the built-in's flickering for AF assist.
The more powerful flash does not enable faster shutter speeds. The flash duration is always much shorter than the camera's x-sync (1/200 sec.), so you get the full benefit of the flash whether the shutter speed is 1/200 sec. or 30 seconds. To shoot flash at shutter speeds faster than the x-sync requires an accessory flash capable of FP High Speed Sync, like Canon's -EX series models, or similar from Sigma and others.
Last edited by Lemming51; 01-05-2010 at 01:27 PM.
Thank you for your response.
Regarding the Auto Check: The flash symbol is present in the viewfinder every time I press the shutter release button half way (the flash recharges very fast). I fired the flash without looking thru the viewfinder and I noticed that the AUTO CHECK light is ON during the flash and during the recharging (while TEST/CHARGE light blinks) and then turns OFF (when the TEST/CHARGE light remains solid).
I don't believe that this is the proper function.