TT350C HSS with E-TTL does not work on the M6 Mark II

[Mencius]

Hi All

Recently, I was looking for a small flash for my M6 Mark II and came across recommendations here and elsewhere for the Godox TT350C. I mostly want it for fill and bounce, but I was also very interested in fiddling with high speed sync, despite knowing that the flash is not very powerful so won't often overpower the sun.

However, I can confirm that with the TT350C on the M6 II and HSS turned on, E-TTL does not work. Instead, the flash always fires at full power.

After receiving the flash I did some digging and found threads noting this as an issue on the M50 Mark II but I couldn't find anything about the M6 Mark II. So, for anyone else like me who is considering this flash for the M6 II and is interested in HSS, be aware it will not work with E-TTL.

I emailed Godox support and they confirmed it does not work on the M6 II and that:

We're sorry that right now they don't have any solution for this. Really sorry for the inconvenience. But they will also try their best to see if there is a way for this in the future.

Which is nice, it's good of them to try their best, the last firmware for the TT350C came out in 2019 and the M6 II is discontinued so I do hope they try their very best.

Well, that's it. Does anyone have tips for balancing exposure with manual flash output when using high speed sync? I'd still like to try it out but I'm a total beginner with speedlites.

 

[R2D2]

Hi All

Recently, I was looking for a small flash for my M6 Mark II and came across recommendations here and elsewhere for the Godox TT350C. I mostly want it for fill and bounce, but I was also very interested in fiddling with high speed sync, despite knowing that the flash is not very powerful so won't often overpower the sun.

However, I can confirm that with the TT350C on the M6 II and HSS turned on, E-TTL does not work. Instead, the flash always fires at full power.

After receiving the flash I did some digging and found threads noting this as an issue on the M50 Mark II but I couldn't find anything about the M6 Mark II. So, for anyone else like me who is considering this flash for the M6 II and is interested in HSS, be aware it will not work with E-TTL.

I emailed Godox support and they confirmed it does not work on the M6 II and that:

We're sorry that right now they don't have any solution for this. Really sorry for the inconvenience. But they will also try their best to see if there is a way for this in the future.

Which is nice, it's good of them to try their best, the last firmware for the TT350C came out in 2019 and the M6 II is discontinued so I do hope they try their very best.

Well, that's it. Does anyone have tips for balancing exposure with manual flash output when using high speed sync? I'd still like to try it out but I'm a total beginner with speedlites.

Just FYI, HSS + ETTL doesn't work with that flash on any of the R cameras either. You can only do one or the other. Canon changed their flash communication protocols a few years back, so no joy.

I have read that the latest Godox flashes and/or transmitter (Godox XPro II-C) MAY do both simultaneously on Canon cameras, but you'll have to research that more. Don't know if that holds true for the M6ii specifically.

If you want to balance ambient light with daylight, you can also just shoot HSS with manual flash power. Easy to do with the nice dial on the 350 (just keep in mind the inverse square law).

Best of luck!

R2

 

[Mencius]

Very interesting, well perhaps the little EL-100 would have been a better choice. The TT350C is just such good value.

Also, I do not think the TT350C's auto-zoom takes the 1.6x crop factor into account. I was experimenting with the ef-m 22m and I noticed that the flash head stays in its widest position (24mm) when set to auto zoom.

So, good value but disappointing compatibility, everything certainly does not work perfectly on automatic.

 

[R2D2]

Very interesting, well perhaps the little EL-100 would have been a better choice. The TT350C is just such good value.

I have the Adorama Flashpoint version of the 350. Indeed a nice little flash. I don’t use TTL though (TTL’s inconsistency drives me crazy). I’m fine with it in manual tho.

Also, I do not think the TT350C's auto-zoom takes the 1.6x crop factor into account. I was experimenting with the ef-m 22m and I noticed that the flash head stays in its widest position (24mm) when set to auto zoom.

Nope, it keys on the actual focal length. It doesn’t know if you’re using the entire image circle or not.

So, good value but disappointing compatibility, everything certainly does not work perfectly on automatic.

Try using the manual method I described. You just observe the change in subject distance and spin the dial (ie twice the distance is 2 stops).

Best of luck!

R2

 

[Mencius]

Also, I do not think the TT350C's auto-zoom takes the 1.6x crop factor into account. I was experimenting with the ef-m 22m and I noticed that the flash head stays in its widest position (24mm) when set to auto zoom.

Nope, it keys on the actual focal length. It doesn’t know if you’re using the entire image circle or not.

Indeed, although the 'technical data' section of the manual says:

"Auto zoom (Flash coverage set automatically to match the lens focal length and image size)"

I'd wondered what they meant by image size and whether that would be sensor size but apparently not.

Also, to experiment with manual flash I was interested in the TT350C's guide numbers at its different zoom settings but they only publish 36m as the guide number at 105mm and 100 iso.

I found another thread where they concluded that guide number varies by approximately the square root of a flash's zoom head position.

So, for anyone like me who may be looking for this in the future here are estimates (not proper measurements) of the TT350C's guide numbers in metres at each of its zoom settings:

• 24mm - 17.21m
• 28mm - 18.59m
• 35mm - 20.78m
• 50mm - 24.84m
• 70mm - 29.39m
• 80mm - 31.42m
• 105mm - 36m

So, good value but disappointing compatibility, everything certainly does not work perfectly on automatic.

Try using the manual method I described. You just observe the change in subject distance and spin the dial (ie twice the distance is 2 stops).

Best of luck!

R2

Thanks, I am reading up about using manual flash, do you have any tips for a quick way to work out what flash output to use for fill flash?

 

[R2D2]

Thanks, I am reading up about using manual flash, do you have any tips for a quick way to work out what flash output to use for fill flash?

Fill flash is 100% a matter of personal taste. I try to be subtle and never have it look like I used fill flash.

There are so many variables that affect flash exposure (environs is a big one). TTL drives me crazy with inconsistency. I just shoot a test shot or two, then adjust flash power for distance thereafter (inverse square law again).

R2