topic Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos in EOS DSLR & Mirrorless Cameras

EOS R5 and sigma Art 50mm 1.4 dark band across top of photos

artyman — Mon, 18 Aug 2025 14:46:03 GMT

Hi, just had a strange situation where after turning on the camera and shooting in bright sunlight and then also indoors, my pictures are recording with a dark band from top to bottom, almost like the shutter has not fully opened/closed correctly. Using a Canon R5 and Sigma Art 50mm 1.4 plus adaptor control ring. The lens is in excellent condition but hasn't been used for a while until the other day when I did an outdoor shoot of 400 picture without issue.

Today, however, this problem happened, and nothing regarding shutter speed or aperture changing would correct the problem. After 36 picture of the same result I turned the camera off and on again and the problem looks to have gone away. Just a bit concerned and wondered if anyone might be able to throw some light on this.

Many thanks in advance, Lee.

Pics included here, the last one being very extreme.

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

Peter — Sun, 17 Aug 2025 15:55:10 GMT

If that is in daylight, then the shutter is broken.

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

artyman — Sun, 17 Aug 2025 16:17:11 GMT

The fault seems to be intermittent, and would the camera be showing a fault code if the shutter was broken?

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

stevet1 — Sun, 17 Aug 2025 16:35:23 GMT

artyman,

Have you tried a different lens and no adapter control ring? Are the results the same?

Steve Thomas

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

artyman — Sun, 17 Aug 2025 16:48:00 GMT

I've changed lenses to a 100-400 MKII and again occasional issues. I don't have an RF lens but plenty of EF glass. The mechanical shutter sounds okay and without the lens on operates and doesn't look to have any damage. The camera is only 6 months old and doesn't have a massive shutter count. Potentially I guess the adaptor may be at fault? (This was also new, purchased at the same time as the camera)

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

Peter — Sun, 17 Aug 2025 17:02:52 GMT

My 30D doesn't show any error code, but the shutter failure on that camera is only visible at short shutter speeds.

The adapter and the aperture in the lens will not produce straight lines. The mirror, focus screen and a shutter will, and your R5 doesn't have a mirror or a focus screen.

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

artyman — Sun, 17 Aug 2025 17:27:45 GMT

Would you be good enough to explain your reply about not producing straight lines and also about shutter failure only being visible at short shutter speeds, please.

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

Peter — Sun, 17 Aug 2025 17:40:28 GMT

My 30D gives me the classic arc pattern. Light leak somewhere in the shutter.

About the straight lines you have how it looks like here https://youtu.be/ptfSW4eW25g?si=-6Bzgk_MuBAgtFNB

You still have warranty after 6 months.

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

Waddizzle — Sun, 17 Aug 2025 18:00:37 GMT

Have you tested the camera outside, away from flickering, artificial light sources?

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

artyman — Sun, 17 Aug 2025 18:06:59 GMT

Pictures above are outside.

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

artyman — Mon, 18 Aug 2025 14:30:44 GMT

Hi folks, I'm still looking for answers before sending camera away for investigation.

I found this on the net and wondered if this might be a problem with mirrorless cameras. Although a few of my shots were only at 3200 shutter speed and it was still happening (although majority a 5000 and 8000 SS).

Any help would be appreciated because if it's intermittent and can't be replicated under investigation I will have wasted my time and be no further in solving this problem. Note, can someone please confirm that if there was a shutter problem then there should also be an error code popping up on the camera screen?

I have another paid shoot this Thursday and will take a back-up, but will probably shoot electric first curtain with the R5.

Iv'e tried replicating the problem today but as of yet it hasn't happened! (this was after I removed lens and adaptor, cleaned contacts with microfibre cloth and put back together).

Re: Canon r5 and sigma Art 50mm 1.4 dark band across top of photos

artyman — Mon, 18 Aug 2025 14:43:49 GMT

Before I get asked why the high shutter speed, I'm outdoors shooting at 1.4 in bright sunshine for events.