Canon R5 Mark II Firmware 1.2.0 — Low-Light, 120fps & Lens Issues Explained
Canon has released Firmware Version 1.2.0 for the EOS R5 Mark II.
I’m Kolbassia Haoussou, filmmaker and photographer behind KH CAMS, and I didn’t rush to review this update.
Instead, I tested the firmware extensively in real-world shooting conditions in Kuala Lumpur and Geneva before sharing my findings.
In this video, I break down what Canon says this update improves — and a serious issue I discovered during testing that every R5 Mark II owner should be aware of.
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What Canon states Firmware 1.2.0 improves:
• EOS Multi Remote support
• Fix for distorted live-view and Err70 during dark multi-exposure shooting
• Fix for FTP transfer error (Err41)
• Fix for CFexpress card formatting issues
• General system stability improvements
What I observed during real-world testing:
• Extremely noisy live-view in low-light standby
• Noise disappears only after pressing record
• 120fps slow-motion footage becomes heavily noisy and close to unusable
• Camera failed twice to recognise the Canon RF 15–35mm f/2.8 L lens
• Online firmware update process felt slow and unreliable
• Battery drain appears faster (requires further long-term testing)
To confirm this was not a broader Canon issue, I tested the R5 Mark II, R5 C, and C80 side by side using:
• RF 35mm at f/2.8
• ISO 800
• XF-AVC 8K on R5 Mark II & R5 C
• 4K on C80
• Official Canon LP-E6P batteries
Result: Only the R5 Mark II showed this behaviour.
Both the R5 C and C80 remained clean and stable.
This strongly suggests a firmware-specific issue affecting the R5 Mark II.
If you regularly shoot in low light or rely on 120fps slow motion, this is something you should carefully consider before updating.
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Community question (R5 Mark II owners)
Have you updated to Firmware 1.2.0?
Are you seeing similar noise behaviour or lens recognition issues?
Please share your experience in the comments — real-world data matters here.
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Chapters
00:00 – Intro
01:25 – Why I waited to test this firmware
01:34 – Canon’s official 1.2.0 improvements
02:20 – Low-light noise issue
03:57 – 120fps slow-motion noise (major concern)
04:21 – R5 C & C80 comparison test
06:11 – Battery behaviour
06:35 – Should you update or wait?
08:11 – Community feedback
09:12 – Final thoughts
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Gear tested
• Canon R5 Mark II
• Canon R5 C
• Canon C80
• Canon RF 15–35mm f/2.8 L
• Canon RF 35mm f/1.8
• Canon LP-E6P battery
• 4TB CFexpress Type B
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