dwdallam wrote in post #15992317
They will work in HSS with all cameras think, or at least most of them. The problem is that after you go over (on most cameras, some older ones seem to work, but I cannot confirm that) one stop below your camera's sync speed--you automatically go into HSS.
So with a camera that has a sync speed of 1/250th you would be limited to a shutter speed of 1/125th--unless you go into HSS mode. The problem is that HSS greatly shortens the distance of the flash and eats power like wolves eat rabbits.
I finally made the decision to buy one 600RT (I needed a fourth flash) and buy a second set of Odins. So now I have one extra Odin TCU and one extra Odin Receiver. the 580EXIIs I have work as well as the 600 and I cannot justify the upgrade. So now I have triple back up: One STE2 and two Odin TCUs + one extra receiver.
Total cost of while having 4 flashes (1100.00)
If I had bought totally into the Canon system that would have been 4x 500+ for the flashes at over 2200.00 ish. I just could not justify that plus the reduced flexibility of the Canon system. (I use the Odins to trip studio and a mixture of studio and Canon flash units.)
Not so! Your flash system will not automatically go into HSS unless you have enabled HSS and the cameras shutter speed is set above the max sync speed of the camera. Even with HSS enabled the flash system will still function in normal flash (non HSS) until you set a shutter speed at least 1/3 stop faster than the cameras max sync speed. For my 5DmII I need to set a shutter speed of 1/250 before I get HSS. I get the little warning icon <!Tv> but HSS does NOT automatically kick in one stop below max sync speed even with HSS enabled. The warning icon <!Tv> is present on the 5DmII at shutter speeds of 1/125, 1/160 and 1/200 to warn you that you are not completely syncing with the flash but the flash does NOT go into HSS. At shutter speeds from max sync speed down to one stop slower than max sync you get a slight shadowing of the lower portion of the image frame from the rear curtain closing but it is not very noticeable except when shooting white eraser boards.
EDIT: The first 3 images were all shot with a 5D mII, ST-E3-RT as master and a 600EX-RT as slave with the flash bounced off the wall behind me. The flash mode was manual at 1/1 (full) power and HSS was enabled for all images. All images were shot at f/4 and ISO 100 and only shutter speed was changed. 1st image 1/100 (1/2 max sync): you can see the flash synced with the shutter and we have a nice clean image. 2nd image 1/200 (max sync): we are having some sync issues and lower portion of the frame is shadowing but so far the flash is still in normal flash (NO HSS). 3rd image 1/250 (1/3 stop more than max sync): we have clearly lost about 2 full stops of flash power due to HSS with only 1/3 stop increase in shutter speed.
Edit II: This second set of images were all shot with the 5D mII, ST-E3-RT as master and a 600EX-RT as slave on a light stand direct flash (no modifier) zoomed to 50mm. The flash was in manual mode with flash power 1/1 (full) and HSS was enabled for all shots. An ISO of 50 and f/11 aperture was used for all images. In the first 3 images the flash was 7 feet from the subject and in the last image the flash was moved to 3 1/2 feet to make up for the about 2 stop loss of HSS. In the first 2 images the exposure on the subject face is the same which means that HSS, although enabled, was not used by the system. In the third and fourth images HSS was used as the shutter speed was set to 1/250 (1/3 stop faster than max sync).
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