Thank you, CaptainC, as always, you are a plethora of information. I am showing my ignorance (not stupidity). How would I know if the Sony is optical, the 580 EXii is not by my bit of research. I do not see whether Sony's flashes are optical in their data within the manual unless I missed it. I will go back and read the manual more thoroughly and continue to research. I will say that after reading your post, I googled optical slaves and found that Canon does not play well with others. I felt in my heart that it was a proprietary issue, I was just hoping... I may be trying different methods for a remote flash. Again, I truly thank you for your response.

Sounds like you may know setting on the camera to use. I set the flash to manual just to try to get it to flash, but with no luck so far. Thanks so much for helping.

Great point. I will do this. Thanks.

No, as per the manual, I think that all must be on the same channel to work. I will try though. Thanks for your help.

I am fairly certain this ST-E2 is IR. I will say that Sony does needs to check with Canon's speck writers. Canon's manuals are much more readable. I did read that all flashes must be on the same channel in the manual. I am in a rather dark den with both flashes in my lap facing the camera, so I do not think distance or line of site is the issue. It has to be my controls. I am very glad that the Canon flash will work remotely with the transmitter on the camera because I need it this Friday. I tried to use the Sony as the transmitter, but I guess I just can't find the right control. Thank you for the info, I have learned from your input. These cameras are just smarter than me!

Must have settings on the Sony incorrect. Sony is flashing. I have flash on Wireless, remote; but the Canon will not flash? Thanks for helping, but I am still trying. I tried every mode setting on the flash. UGH!

I have recently purchased an a7rII and a HVL-60m flash. I really like the flexibility of the new flash, but my research suggested that I had to have a trigger on the camera to engage remote flash. This I did not find in the Sony literature but online. Well, the interesting fact is that I have a Canon 580EXii speedlite and a Canon speedlite transmitter. Well, my remote Canon transmitter works the remote Canon speedlite on the a7rII, but not the HVL-60. Both are set to Channel 1 and I have tried them separately and together. Here is the question, is there a way to use my Canon transmitter as a trigger to ignite the Sony HVL-60 and can I use the two different brands of flashes in conjunction or are these proprietary? I can not find what to actually set my Sony flash on to deliver a remote flash using this transmitter. I have tried the different modes; Manual, TTL, WL RMT, etc. but must be doing something incorrectly. I am really not wanting to purchase another expensive Sony flash as a trigger. Your help is greatly appreciated.

I am curious with your findings. I am afraid to jump ship from Canon.

Are you leaving Sony?

You are amazing! 'Nough said.

Love Mrs. Brown! Thanks for the laugh out loud.👍🏻

I knew someone would come up to the plate!

As a novice with a 7d I will offer suggestions. There are some outstanding folks that have a great deal more knowledge than myself. Does the focus work on Auto? That might be a clue if it works that the general focus is working. Also, look at the quick button. You can change the type focus there too. The button on the far right should change styles of focus and there is a small button at the top by the shutter release that works for me. You will get many replies that will help. I just wanted you to know hoggers do read and will help.

Oh, I don't do it all at once. That's the problem. It takes me a while, the savings for the special occasion is gone before I finish.

Now that is a tough shot! Thank you for the mighty hand of Dixiegirl? Your talent is a gift to us all.