Yongnuo YN14EX Ring Flash Will Not Work Properly on Canon 90D

[Chris_N]

My Yongnuo YN14EX Ring Flash worked perfectly on my Canon 550D (Rebel T2i) and on my Canon 760D (T6s). I got perfect exposure with ETTL. However, On my Canon 90D it gives me about 3-4 stops of underexposure at iso 100. The other problem is that the ETTL will not automatically compensate for the changing iso. So using iso 200 increases exposure 1 stop, iso 400 - 2 stops etc. In theory, setting the iso to 800/1600 would compensate for the 3 or 4 stops of underexposure but that would give me a lot of grain. I prefer to shoot macro shots at iso 100.

All I can do is run a test exposure and dial in 3 stops of exposure compensation on my camera or on the flash which is very annoying. By that time, the subject may have disappeared.
I know the short answer may be that this flash is just not compatible with the 90D. I have no idea what the difference is in the firmware that makes the 90D handle flash differently compared to earlier Canon models.

I would appreciate any thoughts and suggestions to find a solution to this problem. Maybe, I have the wrong camera flash settings. I have firmware 1.1.1 which appears to be the latest one. Your thoughts would be appreciated.

Kind regards
Chris

[skyman]

I have the same problem. I built a portable5 point studio that cosists of a yn-e3-rtII trigger, and a mixture of yn600ex-rt's, yn600ex-rt ii's, and yn968ex-rt flashes. On my older bodies is works fine, but on my 90d I cannot use E-TTL in any combination. Mostly it is under exposed but sometimes it is horribly over. this basically means I can't shoot fill flash. The weird thing is it appeared to work normally until the first time I shot E-ttl in aperture priority mode. I have tried the firmware update route but that hasn't worked - and they are a paint to update. I will try a canon branded trigger to see if that can help, but it means that I am without a flash that can do E-ttl which is critical for events where I might want to bounce. I suspect the cause is canon uses a flash meetering system from the R series cameras on the 90d and the yongnuo doesn't correctly interpret the results.

[Waddizzle]

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@skyman wrote:

I have the same problem. I built a portable5 point studio that cosists of a yn-e3-rtII trigger, and a mixture of yn600ex-rt's, yn600ex-rt ii's, and yn968ex-rt flashes. On my older bodies is works fine, but on my 90d I cannot use E-TTL in any combination. Mostly it is under exposed but sometimes it is horribly over. this basically means I can't shoot fill flash. The weird thing is it appeared to work normally until the first time I shot E-ttl in aperture priority mode. I have tried the firmware update route but that hasn't worked - and they are a paint to update. I will try a canon branded trigger to see if that can help, but it means that I am without a flash that can do E-ttl which is critical for events where I might want to bounce. I suspect the cause is canon uses a flash meetering system from the R series cameras on the 90d and the yongnuo doesn't correctly interpret the results.

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This thread is old.  Please start a new thread of your own so that the description of your issue appears at the top of the thread, where it can be easily found.  Thanks, ahead of time.