Difference result on or off camera

I just got a yn685 and I'm getting completely different results when bouncing with the flash on the camera and off camera. I am using ETTL and off camera all works as intended, giving me a good exposure. If I put the flash on the camera hotshoe, it under exposes . Any idea of why? Both shot in Manual mode 1/200 f4 iso 100


Off camera bounced

If I didn't know otherwise, I'd've said it didn't fire. What camera mode were they shot in? Green square, P or A semi auto mode? What's it like in manual mode at say 1/32? Or 1/16? If it doesn't fire in manual you have a hotshoe fault. Were you using a trigger or the cameras built in transmitter to fire the off camera flash? If it was the cameras built in transmitter I'd say might be a faulty hotshoe, my 600D is like this. My 70D is fine. If it fires in manual it might be your iso is too low. P mode usually selects a slower shutter to let more light in. Raising ISO will help in P mode, as will EV. It might take a combination of the two. Alternatively, when on camera, you should be able to add positive FEC on the gun itself whilst in TTL mode. Many flashes need this, and I suspect the Yongnuos are no different. The strobist website will help more with this.

Colin Glover wrote in post #18140021
If I didn't know otherwise, I'd've said it didn't fire. What camera mode were they shot in? Green square, P or A semi auto mode? What's it like in manual mode at say 1/32? Or 1/16? If it doesn't fire in manual you have a hotshoe fault. Were you using a trigger or the cameras built in transmitter to fire the off camera flash? If it was the cameras built in transmitter I'd say might be a faulty hotshoe, my 600D is like this. My 70D is fine. If it fires in manual it might be your iso is too low. P mode usually selects a slower shutter to let more light in. Raising ISO will help in P mode, as will EV. It might take a combination of the two. Alternatively, when on camera, you should be able to add positive FEC on the gun itself whilst in TTL mode. Many flashes need this, and I suspect the Yongnuos are no different. The strobist website will help more with this.

Hey, thanks for the answer. Found that this is a common fault on YN flashes. Changed evaluative metering to average solves the issue 100%. Was shooting in manual mode, iso 100 f4 1/200. The ettl was working perfect with the flash attached to the YN622, but underexposing when connected to the camera (only on shots >80-90mm, wide shots were metered correctly). Flash manual mode worked perfect, all the rest worked perfect. So far I am liking this product a lot. Much cheaper than the canon ones

Good. Indoors you can up iso to say 800 or at a push 1600 to get better shots. And a softbox diffuser will help. I have a Polaroid one which is cheap as potato chips, and gives a good light.

Interesting as I have a couple of these. So far I've only used them off-camera, paired with my YN 622C-TX. I won't be able to test this until next weekend, but I'll see if I get the same issue on camera.

frozenframe wrote in post #18140280
Interesting as I have a couple of these. So far I've only used them off-camera, paired with my YN 622C-TX. I won't be able to test this until next weekend, but I'll see if I get the same issue on camera.

Off camera worked flawlessly.

cubatahavana wrote in post #18140298
Off camera worked flawlessly.

Yes, I did understand that in your OP, and found the same. What I haven't done is use them on camera, so that's what I'm going to test to see if I too have the same problem. Sorry, I should have made my post more clear.

Well, I tested one of my YN685s, on-camera ETTL bouncing. I bounced off ceiling, off walls, and well, mine does not have this problem. I was getting proper exposure. I tried in a room lit with single ceiling mounted florescent light, and a dark room, lit only by a dim table-top light.
Couple of images to show ETTL bouncing is working. Don't look at the content, all I could find to shoot this time of the night. My model (wife) is asleep.

This is what was lighting the room, ie; ambient.

And you have it in evaluative?

cubatahavana wrote in post #18139985
I just got a yn685 and I'm getting completely different results when bouncing with the flash on the camera and off camera. I am using ETTL and off camera all works as intended, giving me a good exposure. If I put the flash on the camera hotshoe, it under exposes . Any idea of why? Both shot in Manual mode 1/200 f4 iso 100


Off camera bounced

Hosted photo: posted by cubatahavana in
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forum: Flash and Studio Lighting

On camera bounced

Hosted photo: posted by cubatahavana in
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forum: Flash and Studio Lighting

frozenframe wrote in post #18145863
Well, I tested one of my YN685s, on-camera ETTL bouncing. I bounced off ceiling, off walls, and well, mine does not have this problem. I was getting proper exposure. I tried in a room lit with single ceiling mounted florescent light, and a dark room, lit only by a dim table-top light.
Couple of images to show ETTL bouncing is working. Don't look at the content, all I could find to shoot this time of the night. My model (wife) is asleep.

This is what was lighting the room, ie; ambient.

Hosted photo: posted by frozenframe in
./showthread.php?p=181​45863&i=i242135649
forum: Flash and Studio Lighting

ETTL Bouncing off ceiling

Hosted photo: posted by frozenframe in
./showthread.php?p=181​45863&i=i262020783
forum: Flash and Studio Lighting

It almost looks as if OFF camera the communication happened via radio, but ON camera there was a faulty connection via the hotfoot causing it not to work.
Was your non-bounce shot with flash On- or Off-camera, frozenframe?

Wilt wrote in post #18146199
It almost looks as if OFF camera the communication happened via radio, but ON camera there was a faulty connection via the hotfoot causing it not to work.
Was your non-bounce shot with flash On- or Off-camera, frozenframe?

Would a faulty connection not show in average and evaluative metering? As well it only happens on focal lengths over 80

cubatahavana wrote in post #18146261
Would a faulty connection not show in average and evaluative metering? As well it only happens on focal lengths over 80

I have seen a faulty connection cause the flash to stay in 'TTL' mode rather than it detecting the ETTL camera and going instead into 'ETTL' mode. But in that situation the TTL should result in overexposure because the ETTL camera is incapable of measuring light during the exposure and sending the quench ('enough flash output') signal to the TTL flash...the ETTL camera can only send the signal 'give me (predetermined level) of flash output' to the ETTL flash.

The direct flash appears to NOT have 'triggered' the flash at all (dark shot), indicating that the simple Trigger (central pin) and Ground (lateral contact on the foot) were both not properly connected to the sync circuit in the camera. Your shot appears to be a total lack of flash, not an insufficient amount of light from the flash.

Wilt wrote in post #18146325
I have seen a faulty connection cause the flash to stay in 'TTL' mode rather than it detecting the ETTL camera and going instead into 'ETTL' mode. But in that situation the TTL should result in overexposure because the ETTL camera is incapable of measuring light during the exposure and sending the quench ('enough flash output') signal to the TTL flash...the ETTL camera can only send the signal 'give me (predetermined level) of flash output' to the ETTL flash.

The direct flash appears to NOT have 'triggered' the flash at all (dark shot), indicating that the simple Trigger (central pin) and Ground (lateral contact on the foot) were both not properly connected to the sync circuit in the camera. Your shot appears to be a total lack of flash, not an insufficient amount of light from the flash.

So, Would you recommend to send the flash back? I just don't understand why one mode works and the other doesn't. My 430EXII works perfectly in both modes. Feck it, back it goes to amazon.

Wilt wrote in post #18146199
It almost looks as if OFF camera the communication happened via radio, but ON camera there was a faulty connection via the hotfoot causing it not to work.
Was your non-bounce shot with flash On- or Off-camera, frozenframe?

The non-bounce shot was just actual ambient light, flash shut off. Then I shot with the flash, on-camera, bouncing off the ceiling. I didn't even attempt off-camera because until last night, I've always shot off-camera and had no problems with it that way.

cubatahavana wrote in post #18146156
And you have it in evaluative?

I may have left it on spot-metering, that's what I used to get the ambient shot. I just turned the flash on and fired another shot using ETTL on the flash.