I have often seen people ask whether it is better to buy a camera with low shutter cycles or doesn't the shutter count matter.
I've used the term "cycles" because every time you press the shutter button the shutter cycles from closed through open back to closed. That's one cycle but so is opening the shutter for live view or video. Additionally battery ultimate life is given in charge cycles, though the manufacturers don't often tell us what that life is. Nikon's life counter is, I understand, based on full charge cycles. The life of a Xenon flash tube is measured in cycles too. So, if it's OK I'll use cycles.
The simple and obvious answer is "it depends". Let me explain, if a camera has an expected shutter life of 150,000 cycles, common for a consumer product, then shutter cycles might be of more significance than would be the case with a flagship camera offering 400,000 cycles. However, if you take around 10,000 shots a year that consumer camera with 50,000 cycles will last you around 10 years before reaching its expected life. If you keep, or intend to keep, a camera for 10 years that's not likely to be a problem.
If you're looking at a flagship camera with 200,000 cycles and you take 10,000 images a year that's 20 years life. I bought my first D4 with nearly 400,000 cycles and an expected life of 400,000 cycles, it lasted five years before I sold it, still working.
Thus, to answer the question, it depends: On the camera, the photographer and the budget. I wouldn't let high shutter cycles put me off if everything else was OK.
I should perhaps point out that my 10,000 images a gear are spread between three bodies.
I say yes and no. yes in the sense that if it has its original shutter, it may be of relevance if you're buying/selling a camera. If it has a shutterless design (like the R3, Z8 and z9) then it has little to no significance in my view, other than how heavily the camera may have been used but beyond that not really relevant.
Now I'd say that for the most part, many people probably don't get to 150k cycles or even 100k cycles before they upgrade, so I never found the estimated shutterlife to be of much concern. I mean at the rate I shoot my Zf, which has a mechanical shutter and the camera I use most out of the two I own (the z8 being the other one but it doesn't have a shutter), it will probably be fine for the next 5 years at least, at about 25,000 shots per year, and at about 20,000 shots under it's belt now being 1.5 years old. When the time comes, I'll just have the shutter replaced on it (I think someone told me if Nikon does it it's about $350 or so) and then I'll be good for probably another 7-8 years, so I'm not that worried about shutter count.
I was with my D750 but that's because some people were reporting shutter failures as early as 50k and others 75k, although back then I was maybe only shooting 8-10k per year, but it was still a concern because the camera was (at the time) $2000+, plus it was rated at only 150,000 cycles. So that was perhaps the only one I worried about. When I moved to the Z system, I stopped worrying about it. (My D750 was traded in for a Z6 with about 60,000 on the shutter but I knew someone whose D750 made it to 152k clicks and then he put a new shutter in it -- had someone do it for him for about $200, and it still works today, although today it's his backup camera to his Z7 II so it likely doesn't get much use).
So I would say that for some people, shutter cycles might matter but only when buying/selling gear or if you're a heavy shooter (perhaps pro) then you may want to pay attention especially if you're doing say 50k clicks a year as you will need to perhaps take some preventative measures later on (have a backup camera, or have your camera serviced) as you get closer to the MTBF rating (usually around 200,000 for modern cameras). But for most people, particularly enthusiasts, it's not something that someone should really worry about that much about (again, aside from the buy/sell scenarios). But also with buy/sell, condition of the camera is also an equally important factor, so it's not just about shutter count.
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