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Pros: This optical trigger is cheap. Has PC-sync connection and optical eye which can be triggered with flash. Easy to mount with 1/4" screw and mounting flash to hot shoe is stable.
Cons: Build quality is not good, first time I used one of my two triggers broken. Bottom-hot shoe bend and cracked.
Other Thoughts: Optical eye doesn't trigger my Vivitar 265, which trigger voltage may be to big.
Bottomline: If you need trigger your hotshoeflashes indoors, you can use these. Eye needs to be aimed to flash and outside this doesn't work when sun is shining.
Pros: Works perfectly with the canon 540EZ. Much more reliable than the cheap RF cactus triggers.
Cons: Does not work with the EX series (I have canon 430EX), it flashes once, then you'll have to powercycle to use it again, I use the radio trigger for this 430EX, and then the optical trigger for the 540EZ.
Other Thoughts: I use these for multi flash setups. If you don't have anythign taht needs a PC sync cord, then you can just get the SYK-3 ones instead.
Bottomline: Perfect for if you have any cheap old flashes that you'd like to put to use. will not work on minolta shoes. Will not work with 430EX.