Canon releases firmware updates for the EOS R5 and EOS R6
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Yes, I used option 1 and I’ve used it at least 12 times and it works great.
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Here we go. Are you reverting because you are sure you've found a problem, or because you are going to effectively toggle back and forth for further testing?
Are you going to report to Canon?
The MFD is one of the many joys of the 100-500mm. Sigh...
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Will be glad to get the god awful 1.5.1 off, took a photo of my dog (cockapoo) the other day and had the red box on the image preview and it showed the autofocus had focused on the eye but his noise was in focus was 2-3 inches out 
not to mention hopefully the lock ups will stop had another one the other day and there wasn't even a lens connected
not to mention hopefully the lock ups will stop had another one the other day and there wasn't even a lens connected
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Further testing. I dried human eye AF and it was fine when the lens was zoomed out and the face was small, but when very large in the frame, the camera lost it. Perhaps you could try. I'm going out today using 1.5.2 in the field and searching for really close ups like butterflies I know well. It's with the 100-400 as well, not just the 100-500,
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I was planning to try 1.5.2 but your experience has caused me to pause. I know how systematically you test, and your test findings here have been incredibly comprehensive and helpful.
While I believe the reverting process works, I'm still reluctant to mess around much with the process.
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This is coming from an enthusiast, not a pro, just for context.
That said, when I upgraded to 1.4.0, I noticed the tracking seemed to nearly drop to the level of the R. That's honestly a bit of an overstatement, but it definitely didn't feel like the R6 anymore. One example, which I mentioned in one of my past posts, was on Christmas morning, when I was shooting a 5-10 minute video of my daughter opening her presents. The tracking was nearly useless. I had to keep tapping on the touchscreen to tell the camera where to focus, even though I had eye detect on and the AF was in Person priority mode. It was frustrating.
The quick tests I did the other day were as follows (these were done inside, in relatively poor lighting conditions, with the RF 35mm):
1) Photo mode. Had my wife try to confuse the camera to the best of her ability. Turning, swinging, moving forward and back, etc. Tracking locked on to her and wouldn't let go.
2) Video mode. Told my four year old to go nuts so I could make a video. She complied. She ran around in circles through three of our rooms while I stood in one spot. She was running as fast as she could, and going in and out of the frame. Tracking stayed on her while she was visible. When she would run out of frame and then re-enter the frame, it locked on again right away. We did this for a solid two minutes (she didn't want to stop running even after I told her she could stop...haha), and the results were consistent. Additionally (and rather impressively), at one point my dog walked in the room to figure out what the heck was happening. When my daughter went out of frame, the AF locked on the dog (even in Person priority mode). When my daughter came back in frame, it locked on her.
Now, as far as the accuracy of the AF, I haven't really tested that with 1.5.2 yet. I didn't notice any problems with AF accuracy with the past releases, unlike some others. And it still seems to be fine from the little I've seen with 1.5.2. AF tracking was always what I thought had taken a dive with 1.5.0.
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Thank you! Here's a shot I took recently, when my 100-500mm came back from repair. Taken right at MFD, 363mm, by simply shooting straight down hand-held. It's amazing to be able to get so close with a zoom like this. Truly makes the lens a versatile hiking companion, in my opinion.
Firmware 1.4 on the R5.
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Just upgraded to 1.5.2 from 1.5.0 and I’ve lost autofocus almost entirely. I get the terracotta box which flickers almost imperceptibly with the blue box. Sometimes it’ll focus on something in the foreground but then pulls away. On 1.4 I don’t even remember seeing the terracotta box once, there’s always something to pull into focus.
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Bit of an update, I’ve got autofocus back but I’ve had to well over expose the image (+2 at least). It seems to latch on to light colored objects but not darker objects. But even when it finds something, it then keeps jumping around pulling the focus all over the place. I’m gonna roll back to 1.4 and try upgrading once more. If I don’t have any joy I’ll bring it into the canon center in Shibuya.
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Tried out 1.5.2 with the R5/100-500mm for BIF this afternoon. Fantastic - locked onto and tracked Blackheaded Gulls wheeling around against tricky backgrounds - definitely at least as good as earlier versions. But, this is what really impressed me - a Skylark belted past, just a speck in the sky at full speed. The R5 locked on and got a burst in focus for 26 shots in 1.27s as I tracked it traverse the lake. Here is a full size reduced and gif of the crop - the bird is only 280 px long. I am not going to downgrade unless I have real problems very close up. 1.5.2 is brilliant at long distances for finding faces, birds and humans, and if I have to work at focus for 1-3m away, I'll put up with it. It was definitely locking on quickly to small birds 5m away yesterday.
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I know it's a typo, but can't resist... I don't think Canon made autofocus for dried out human eyes... creepy!
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I can concur that this update has made a stable improvement to the reliability of the autofocus with portraits - including in vertical composition. I'm very pleased with the results I've gotten this weekend and the AF now appears much more confident and doesn't bounce around/drift. I only has the AF get confused with a face once and that was in a very wide dynamic range shot inside a car shooting in portrait orientation.
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unfocused
Photos/Photo Book Reviews: www.thecuriouseye.com
I haven't yet updated the firmware on my R5, but yesterday I shot a golf tournament with my R3, which has the new firmware "fix." It froze up probably close to a dozen times during the day, the most it has ever frozen up. I kept getting an error message that said to remove the battery and restart it (this message is new as far as I know.)
Today, I shot a baseball game and a softball game -- no freeze. Only difference was the card (Transcend 256gb vs. ProGrade 128 mb)
As I've noted in the past, I've had other freeze ups with the R3 since the firmware upgrade (with SanDisk and ProGrade cards). Since freeze ups seem to be random and occur sporadically, I suspect it will be months before we can be confident that Canon's "fix" actually fixed anything.
Said this before and I'll say it again, we R system users are all paying to be beta testers for Canon's mirrorless system.
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unfocused
Photos/Photo Book Reviews: www.thecuriouseye.com
SanDisk Extreme Pro, 128 and 256 gb; Pro Grade gold 128 gb, Transcend 256 gb. No consistent pattern. And, no commonalities between R5 and R3 -- that is, the same card may experience a freeze with the R5, but not the R3 and vice versa. The R3 does seem to be more prone to freezes with the Transcend cards, but not with the R5 and I have experienced freezes with all three brands.
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