Canon makes REALLY fucking good cameras.
Edit: only reason I replaced it; I got a smaller, lighter camera (also a Canon). the 400D still works fine.
I own a perfectly functioning 40D from 2007 myself, which I replaced by a Sony A7III just recently, as I hate the fact, that Canon tries to force their customers to buy their own expensive RF lenses.
Of course cameras are impressive pieces of technology. Still I understand the sentiment of the above commenter. My last comment was an overstatement, still there is a substantial chance of a hardware failure.
To be honest, Canon EF mount lenses are probably the best buy if you are looking for compatibility: there's adapters for Sony E-Mount, Canon RF-mount, etc.
The reason RF, Z, and E mount exist is because you can make the camera body much slimmer in MILC.
It's much easier building adapters for lenses going from DSLR -> MILC. It might not be possible to go the other way around.
As a result, there is a wide range of third party lenses evailable for Sony FE, none for Canon RF.
I real shame as I would love to use some of Sigma glass on there without use of the EF adapter.
One of the problems Canon has faced recently is a flooding of the market with super cheap lenses (we're talking 50-200 dollars for total junk). The people that are buying them are justifiably upset when the photos are crap because they incorrectly think its a camera problem. Hey, a lens is a lens, right?
Anyhow, there's wide speculation that Canon will license to the quality quality third-party makers at some point [1][2].
[0] https://petapixel.com/2022/09/06/canon-confirms-its-going-af... [1] https://www.canonrumors.com/forum/threads/sigma-to-make-a-ma... [2] https://www.canonrumors.com/forum/threads/the-state-of-third...
https://fstoppers.com/gear/canon-breaks-silence-viltrox-lens...
Vintage glass is great, if you get it good condition.
Guess where? The physical aperture actuator. They're supposed to work for hundreds of thousands of uses, but this one got maybe 20,000 before it began to stick.
https://www.pentaxuser.com/forum/topic/the-dreaded-k30-apert...
I don't worry about the mirrorless camera electronics so much, and even most digital SLRs are quite reliable (even the replacement Pentax K3-II has been flawless). This was a pretty remarkable failure because it stands in contrast to the typical reliability of digital SLRs.
Same for the old F4 sitting in a shelf, or the D750 that replaced the D700 for my dad. I have no reason to doubt Canon is any different (during a lot of those trips other people used Canon, and those held up just fine as well), nor do i have doubt the new mirrorless cameras will be any different. Unless you dump them for prolonged periods in salt water after having them run over by a truck and store them in a warm and humid environment without drying.
Then again, the D4 has a skeleton underneath the plastic and rubber surface that looks like the skull of a killer robot: https://commons.wikimedia.org/wiki/File:2012_Nikon_D4_magnes...
Anyways, we can't really live with fully mechanical cameras in this day and age, unless you want to shoot film in which case Leica has still three cameras that will work without electronics