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Weird thing with shutter count

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crysania View Drop Down
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Post Options Post Options   Quote crysania Quote  Post ReplyReply Direct Link To This Post Topic: Weird thing with shutter count
    Posted: 24 October 2023 at 18:52
Hi folks. I noticed something odd with my a9ii and I'm wondering if there's some explanation for it that I'm missing.

I got the camera used and at the time the shutter count was 43,942.

Since that time, I have used it ONLY in electronic shutter (the person who had it before me did as well -- she was not the first owner either).

I am going to be selling it and so I went to grab the exact shutter count and it said 44,041. I checked to see if it happened at one point in time or if it was gradual and it appears to be gradual. Some photos I grabbed to look at:

10/5/22: 43942
2/17/23: 43989
2/19/23: 43989
5/21/23: 44027
7/16/23: 44041

I checked 2/17 and 2/19 because I wanted two dates close together when I took a lot of photos (around 34k over those three days).

7/16 was the last day I actually used the camera. I switched to Canon that week and kept the Sony as a backup for a time.

I can tell you that I have honestly NEVER used it in mechanical shutter (or first curtain). I have 100% of the time used fully electronic (20fps).

Why would the shutter count change? I would have assumed it would stay at 43,942 but it went almost 100 in the 9 months I used it.

Any know why this is?
 



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Harm vb View Drop Down
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Post Options Post Options   Quote Harm vb Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2023 at 18:56
I noticed the same, but I don't have an explanation.
Maybe the shutting on or off will change the count?
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crysania View Drop Down
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Post Options Post Options   Quote crysania Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2023 at 19:02
I did wonder that and that was part of why I looked at two days close together. But the shutter count hadn't changed on those days! And I know the camera was turned on and off a bunch of times each day. I'm completely confused!
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2023 at 21:33
Likely changes every time the camera does a black frame to check for stuck pixels, I'd imagine it would add 2 "shots" to the shutter count every time it happends.

Test by taking one shot, change the date in the camera a month forward to try and force the reset. Turn off camera and then back on, with luck it will do a check, then take another shot and compare shutter counts.
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crysania View Drop Down
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Post Options Post Options   Quote crysania Quote  Post ReplyReply Direct Link To This Post Posted: 24 October 2023 at 21:39
Is that something automated or something you have to make the camera do?

Alas, I have no lenses left for it so I can't do any photos! lol
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 26 October 2023 at 06:43
Originally posted by crysania crysania wrote:

Is that something automated or something you have to make the camera do?

Pixel mapping occurs automatically once a month ... but that can't account for an increase of 100 actuations in nine months.

PS: 34,000 photos in three days is a lot of photos.
 



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crysania View Drop Down
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Post Options Post Options   Quote crysania Quote  Post ReplyReply Direct Link To This Post Posted: 26 October 2023 at 13:23
Originally posted by sybersitizen sybersitizen wrote:

[QUOTE=crysania]
PS: 34,000 photos in three days is a lot of photos.


No really? Would never have thought of that!

P.S. I shoot dog sports. I shot around 350 runs a day for three days straight. Shooting from around 8am to 6pm with short breaks between classes. That's about 45 photos per run, generally shooting bursts of 5-10 photos an obstacle, plus fun shots of celebrating at the end or some stuff on the flat. I usually aim for 3-4 obstacles that I can get in a run. So in case you're wondering, no this isn't overshooting. It's fairly normal for that kind of an event.
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Post Options Post Options   Quote JosR Quote  Post ReplyReply Direct Link To This Post Posted: 26 October 2023 at 16:07
The newer cameras (e.g. ILCE-1, 7M4, 7RM5) have Menu options for this: "Auto Pixel Mapping" and "Pixel Mapping", see e.g.
https://helpguide.sony.net/ilc/2110/v1/en/contents/TP1000658001.html

"Performs pixel mapping automatically at regular intervals when you turn off the camera.
During this time, shutter sounds will be produced."

And when this is set to OFF, Sony recommends to do it manually "every three days".
I'm not sure about "three days", but my 7R3 definitely does it (much) more often than once a month, so 100 over 9 months could be possible ...
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Post Options Post Options   Quote crysania Quote  Post ReplyReply Direct Link To This Post Posted: 26 October 2023 at 16:13
That would definitely explain it! I had no idea it did the pixel mapping thing.

The camera has gone off to its new home (it sold quickly) and they didn't seem concerned about the shutter count anyway, so it's a moot point. But it was something unexpected!
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 26 October 2023 at 22:32
I was unaware of the revised pixel mapping schedule implemented in some of Sony's newer cameras. Now I know.

My other comment was simply that 34,000 photos in three days is a lot of photos.

I wasn't implying overshooting (although thinking about the culling does scare me).

Edited by sybersitizen - 26 October 2023 at 22:36
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