topic Re: EOS RP flash sync issues in EOS DSLR & Mirrorless Cameras

EOS RP flash sync issues beyond 1/180

Crey23 — Tue, 15 Apr 2025 18:01:24 GMT

Hi all,

I was recently contacted by an IG eos RP user regarding this issue and I tested it out today, and realized I too have this issue in my RP. I was taking pictures with off camera and on-camera (external) flash, and any image above the 1/180 sync speed you can see the at the top of the image the black banding from the shutter. I took it to 1/4000, and it was noticable in nearly all but one of my test shots. I have two cheap speedlights, a Yongnuo YN568 EXII and a Neewer 985C, both have this issue, but it's far more noticable on the neewer. The IG user who contacted me is using a Godox TT560.

Now, I know these are not canon speedlights...but I never had this issue in 650D/(T4i) while using the speedlights (both cameras max at 1/4000 shutter speed).

Could this be an issue of the t.1 power rating? But if so, why at equal settings this is not visible in the 650D (T4i)?

Could the lack of mirror have the sync trhown off? maybe faster now without the time of the mirror to flip?

Anyone else experiecning this?

lastly, I would not presume that the 1/80 sync speed in the camera would be affecting this correct?

Thanks in advance!

Re: EOS RP flash sync issues

kvbarkley — Tue, 04 Jun 2019 13:06:22 GMT

"I would not presume that the 1/80 sync speed in the camera would be affecting this correct?"

Why do you think they call it "sync speed"? It appears that mirrorless' makes it a hard limit.

This is why they invented High Speed Sync.

Re: EOS RP flash sync issues

RobertTheFat — Tue, 04 Jun 2019 14:58:25 GMT

@kvbarkley wrote:
"I would not presume that the 1/80 sync speed in the camera would be affecting this correct?"

Why do you think they call it "sync speed"? It appears that mirrorless' makes it a hard limit.

This is why they invented High Speed Sync.

A sync speed of 1/80?? That makes no sense. I think the last camera I've owned with a sync speed that slow was an Argus C-3.

Or is this just an example of the limitations mirrorless cameras have to endure, given the current state of battery technology? It probably does take more power to fire the shutter at 1/200 instead of 1/80.

Incidentally, even ancient DSLRs like the XTi would ignore the set shutter speed if was above the sync speed and flash was in use. That sometimes resulted in gross overexposure, but at least you didn't see the shutter trying to get out of the way.

Re: EOS RP flash sync issues

kvbarkley — Tue, 04 Jun 2019 16:47:11 GMT

1/80 is a typo, elsewhere he states it as 1/180. Feel better?

Re: EOS RP flash sync issues

RobertTheFat — Tue, 04 Jun 2019 16:54:57 GMT

@kvbarkley wrote:
1/80 is a typo, elsewhere he states it as 1/180. Feel better?

Ah, you're right. I should have read the original post more carefully.

But even 1/180 is at the slow end, by today's standards.

Re: EOS RP flash sync issues

diverhank — Tue, 11 Jun 2019 18:48:06 GMT

There is a problem with the RP high speed sync function...It doesn't happen with all flashes but I know that Godox/Flashpoint has an issue with it - you get the banding near the top in HSS mode.

I personally verified this problem with the Flashpoint Mini Thinklite TTL R2 Flash (Godox TT350 Canon). I have not verified with other flashes. It appears to be a problem with Godox/Flashpoint, even though I haven't tested the RP against the Canon flashes...I'll do it tonight. I don't expect there's a problem otherwise we would have heard about it.

I do think the 1/180 flash sync speed might have something to do with it. Most other Canon cameras have either 1/200 or 1/250.

Re: EOS RP flash sync issues

diverhank — Wed, 12 Jun 2019 05:44:18 GMT

@diverhank wrote:
There is a problem with the RP high speed sync function...It doesn't happen with all flashes but I know that Godox/Flashpoint has an issue with it - you get the banding near the top in HSS mode.

I personally verified this problem with the Flashpoint Mini Thinklite TTL R2 Flash (Godox TT350 Canon). I have not verified with other flashes. It appears to be a problem with Godox/Flashpoint, even though I haven't tested the RP against the Canon flashes...I'll do it tonight. I don't expect there's a problem otherwise we would have heard about it.

I do think the 1/180 flash sync speed might have something to do with it. Most other Canon cameras have either 1/200 or 1/250.

Update: I verified with the flashes that I have. Here is the final report:

1. Canon 580EXII, 600EX-RT (v. 1) work fine with the EOS RP - No banding

2. Flashpoint Mini Thinklite TTL R2 Flash (Godox TT350 Canon) - Problem with banding in HSS mode. Fine below 1/180

3. Yongnuo YN600EX-RT (v. 1) - Problem with banding even with latest firmware update 1.9.1. Fine below 1/180

4. Yongnuo YN968EX-RT - works fine with the EOS RP - No banding

Re: EOS RP flash sync issues

Crey23 — Thu, 13 Jun 2019 04:02:13 GMT

Time to upgrade speedlights....

Re: EOS RP flash sync issues

je_oneal — Tue, 25 Jun 2019 14:22:33 GMT

This is a known and verified issue with Canon. I found out early on that I had this issue and when I contacted Canon USA back in March 2019 they were able to replicate the issue. Not sure how fast Canon works in getting a firmware fix out to resolve this issue but hopeuflly if enough people complain directly to them it MAY help to put a rush on it since it is a customer service issue if they do not respond in a timely manner.

It's not a flash issue but a sync speed issue with the camera itself in HSS mode. I found that on my EOS RP, suffered from this phenomenon at 1/1250sec and continued to the max HSS. Of couse Canon USA states, keep your sync speed under 1/1250sec, this is quite obvious if you do not want the band to ruin your photo but for those of us that routinely shoot in HSS it's a problem that will not go away on it's own if left un-resolved...even for a camera that costs $1,299 it should function as advertised.

The EOS R had a similar issue and it took Canon USA almost a year to relase a firmware update to fix that issue and resolved the face and eye tracking problem that camera was having. I hope this info helps someone in the forum and if you have not contacted Canon USA, please do so, the more complaints they get the better to move this along.

Happy shooting

Re: EOS RP flash sync issues

OzSnapper — Mon, 15 Jul 2019 00:04:03 GMT

Thank you for your posts on this issue. This issue was a deal breaker for me and decided to reluctantly purchase Sony.

Re: EOS RP flash sync issues

je_oneal — Thu, 22 Aug 2019 15:51:34 GMT

NEW Firmware 1.2.0 for EOS RP

Today Canon finally released firmware 1.2.0, this highly anticipated firmware corrects a phenomenon in which the top of some captured images may be dark during high-speed sync shooting with an external flash.

Re: EOS RP flash sync issues

diverhank — Thu, 22 Aug 2019 16:37:11 GMT

Nice. Thanks for the heads up.

Re: EOS RP flash sync issues

Crey23 — Fri, 23 Aug 2019 13:59:48 GMT

Thanks for the heads up. I can confirm that this has solved the issue.

I've tested from 1/160 all the way up to 1/4000 and no banding was found.

Thank you !

Re: EOS RP flash sync issues

bedevere007 — Thu, 12 Sep 2019 21:05:54 GMT

I experienced the same thing this weekend. I had a shoot in Atlantic City Borgata and when I was using Yongnuo 600ex rt II and I believe the max was 250 without banding. Sucks because I'm regretting it I didn't get Sony. I hope Canon starts listening to their customers and fix this firmware. The flash has no issue with 7dMK2.

Re: EOS RP flash sync issues

bedevere007 — Thu, 12 Sep 2019 22:45:28 GMT

I just tested the new firmware and upgraded from 1.1 to 1.2 and it works thank god and the focusing is much better 🙂 Happy again.

Re: EOS RP flash sync issues

Vejas — Thu, 24 Oct 2019 15:00:57 GMT

i updated to lastest firmware, but when using Godox XProC TTL triggers im having strange banding. Any ideas how to solve this or could this be camera defect?
this is pictures taken at speeds of 1/2000s

Re: EOS RP flash sync issues

lucascavalheiro — Thu, 09 Apr 2020 19:46:32 GMT

Same problem here.

Occurs with AD200, Ad200 Pro, XproC, X2TC.

With 430EXII and YN 685C everything is ok

Re: EOS RP flash sync issues

Waddizzle — Thu, 09 Apr 2020 21:23:08 GMT

@lucascavalheiro wrote:
Same problem here.

Occurs with AD200, Ad200 Pro, XproC, X2TC.

With 430EXII and YN 685C everything is ok

Are you using the mechanical or electronic shutter? Use the mechanical one with HSS.

Re: EOS RP flash sync issues

Vejas — Thu, 09 Apr 2020 22:30:15 GMT

you cant choose mechanical on EOS RP

Re: EOS RP flash sync issues

Waddizzle — Fri, 10 Apr 2020 13:46:35 GMT

@Vejas wrote:
you cant choose mechanical on EOS RP

You are correct! False assumption on my part. I cannot find a description of the shutter in the specifications. However, the EOS R has something called "Electronic Front Curtain Shutter", whatever that might mean. The RP might be similar. The point is, though, there is no mechanical shutter.