topic Re: Canon C70 image bands in Sky in Professional Video

Canon C70 image bands in Sky

jbmahany — Fri, 17 Jan 2025 21:38:08 GMT

29.97p, 180 Degree Shutter Angle, 4 Stops built in ND, F5, ISO 800

RAW LT(4096x2160), Canon Log 2 / C.Gamut, Color Matrix Neutral

I have never noticed this before and I just recently updated my firmware. I am curious if anyone else has noticed this. Could the built in ND filter cause this?

Vimeo link to view short video of banding with 2 exposure levels.

Thanks in advance for any help you can provide.

Re: Canon C70 image bands in Sky

shadowsports — Sat, 18 Jan 2025 03:28:24 GMT

Greetings,

Looking into this. Do you see these horizontal lines when playing back on the camera? I don't see anything wrong with your settings. What kind of recording media are you using (brand, model). Wondering if its related to software or display. Also going to get some additional eyes 👀 on it. I have a colleague who owns/owned a C70.

Re: Canon C70 image bands in Sky

AtticusLake — Sat, 18 Jan 2025 08:05:17 GMT

Sorry to see you're having this problem, but I'm afraid I don't know what that could be. I have a C70, and have shot a lot of landscape, daytime videos, and haven't seen this. You can check out my videos here: https://moonblink.info/MudLake/beauty (check the Tech Data for a film to see which bits were shot on the C70).

The only issue I hit occasionally is noise in the image. I don't see why the ND filters would cause this.

Maybe its how your RAW is being processed? Do you see the same thing in HEVC or AVC?

Re: Canon C70 image bands in Sky

shadowsports — Sat, 18 Jan 2025 14:40:52 GMT

Ian,

Thanks for joining. I had the same feeling about bit rates. His frame rates and shutter angle appear adequate for daytime shooting. So I feel this is related to media, software and processing or display. @jbmahany please also let us know if you see this on the cameras LCD during playback?

Re: Canon C70 image bands in Sky

IamintheUK — Mon, 20 Jan 2025 12:08:57 GMT

Did you shoot or render in 8bit or 10bit? This is what I would expect to see in an 8bit 4.2.0 file with strong color correction. Though not so evident in the 8bit picture, you can see the banding in the Parade or a waveform scope.

Re: Canon C70 image bands in Sky

jbmahany — Mon, 20 Jan 2025 23:26:17 GMT

Thanks for your response and help! I will put the footage back on a card and take a look today.

Re: Canon C70 image bands in Sky

jbmahany — Mon, 20 Jan 2025 23:34:05 GMT

RAW LT 12-Bit. I am going to put the shot on my camera and see if I can see the lines. Thanks for your help!

Re: Canon C70 image bands in Sky

jbmahany — Mon, 20 Jan 2025 23:35:36 GMT

Thanks for your help! Do you have the latest firmware? 1.1.0.1?

I have not noticed these lines outside of RAW LT. The next clear blue sky I am going to do a test.

Re: Canon C70 image bands in Sky

jbmahany — Mon, 20 Jan 2025 23:36:31 GMT

Will report back! I see your in the bay area! I am from East Side San Jose originally.

Re: Canon C70 image bands in Sky

jbmahany — Mon, 20 Jan 2025 23:58:57 GMT

Confirmed.. I can indeed see the lines on the LCD.