topic Re: Strange spider web like artefacts on long exposure shot in EOS DSLR & Mirrorless Cameras

EOS R6 Strange spider web like artifacts on long exposure shot

frijsdijk — Tue, 29 Oct 2024 13:27:40 GMT

This shot was taken with the R6 and the Sigma Art 35mm DG HSM (with the Canon EF/RF adapter). Observe the light reflections from the car on the grass 1:1 pixel. It's like there are spider webs there, but there were none and certainly not shaped like this. What are we looking at here? Looks like some sort of artefacts to me.

Edit: Google Drive Link:

https://drive.google.com/file/d/1HIZLeD3MUJ_yBOouzYte9jDNxflON8iJ/view?usp=sharing

Re: Strange spider web like artefacts on long exposure shot

Waddizzle — Sat, 26 Oct 2024 10:47:55 GMT

Please post your file(s) to a public file sharing service. Thanks, in advance.

Re: Strange spider web like artefacts on long exposure shot

frijsdijk — Sat, 26 Oct 2024 10:50:30 GMT

I did? -> https://x0.at/pR3_.CR3

Re: Strange spider web like artefacts on long exposure shot

Waddizzle — Sat, 26 Oct 2024 12:16:12 GMT

I suppose I don’t trust that domain.

Re: Strange spider web like artefacts on long exposure shot

AndyMc — Sat, 26 Oct 2024 12:23:07 GMT

Agreed. Something like Google Drive or Dropbox would lead to more people trusting your link.

Re: Strange spider web like artefacts on long exposure shot

jrhoffman75 — Sat, 26 Oct 2024 12:33:12 GMT

It may be a false positive, but Malwarebytes blocks your link to the site.

Re: Strange spider web like artefacts on long exposure shot

frijsdijk — Sat, 26 Oct 2024 12:35:46 GMT

https://drive.google.com/file/d/1HIZLeD3MUJ_yBOouzYte9jDNxflON8iJ/view?usp=sharing

Re: Strange spider web like artefacts on long exposure shot

jrhoffman75 — Sat, 26 Oct 2024 12:50:23 GMT

@frijsdijk wrote:

This shot was taken with the R6 and the Sigma Art 35mm DG HSM (with the Canon EF/RF adapter). Observe the light reflections from the car on the grass 1:1 pixel. It's like there are spider webs there, but there were none and certainly not shaped like this. What are we looking at here? Looks like some sort of artefacts to me.

Edit: Google Drive Link:

https://drive.google.com/file/d/1HIZLeD3MUJ_yBOouzYte9jDNxflON8iJ/view?usp=sharing

They are caused by having a small aperture with bright objects. If you could the number of rays they will be twice the number of aperture blades in your lens

Re: Strange spider web like artefacts on long exposure shot

frijsdijk — Sat, 26 Oct 2024 14:13:35 GMT

That's not what I meant. I mean this:

Re: Strange spider web like artefacts on long exposure shot

jrhoffman75 — Sat, 26 Oct 2024 15:08:30 GMT

Looks like it might be the beam of light illuminating ridges on the ground.

Re: EOS R6 Strange spider web like artifacts on long exposure shot

frijsdijk — Sun, 03 Nov 2024 09:02:41 GMT

Ok this didn't really get me anywhere, dissapointing.

Re: EOS R6 Strange spider web like artifacts on long exposure shot

Waddizzle — Sun, 03 Nov 2024 13:20:16 GMT

@frijsdijk wrote:

Ok this didn't really get me anywhere, dissapointing.

The image John posted doesn’t look like it began life as a single photograph. Is it a composite of several images together, creating an ultra wide view?

If so, then the stitching process could have introduced artifacts in the end result. I often shoot pano shots, and have had artifacts introduced in a few of my shots. It happens most often on night shots or when the samples do not overlap sufficiently.

Re: EOS R6 Strange spider web like artifacts on long exposure shot

frijsdijk — Sun, 03 Nov 2024 13:30:49 GMT

Is that even a serious question? I mean, if I had stitched images together and get artefacts like that, I would come to a Canon forum asking for an explanation?

I even attached a RAW file. How do you even stitch RAW files together INTO a RAW file??

Re: EOS R6 Strange spider web like artifacts on long exposure shot

Waddizzle — Sun, 03 Nov 2024 17:52:18 GMT

Yes, it’s a serious question. The image seems to have a nonstandard aspect ratio. No, I have not downloaded your and don’t plan to. I can create composite RAW files in Photoshop.

Re: Strange spider web like artefacts on long exposure shot

Peter — Mon, 07 Jul 2025 08:08:44 GMT

A couple of months ago I took a similar picture. I can't find it right now, but in my case it was spider web.