No machinery is perfect. There is always something, usually a tiny little thing, in any machine that seems calculated to annoy you. The car is wonderful but for some reason the heater control is impossible to find in the dark. Or the petrol cap remote release is beside the passenger seat! Or the glove box handle was (apparently) deliberately designed to break fingernails. Or the new computer works brilliantly but for no good reason they made the power switch the exact same colour as the case so that you can't see it. The TV remote control is fine, except that they put the off switch right next to the volume control. As for computer software, don't get me started!
Or the camera .....
Every camera has something calculated to annoy the user, something that bugs you even after owning it for years. What one thing - often a small thing - gets your goat?
Here is mine.
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Canon cameras. Dial direction during Tv/Av. This is the stupidest custom function Canon have ever thought of. Utterly insane.
It's been in every dual-wheel Canon DSLR since people took photographs with two rocks and a fistfull of charcoal on a cave wall, and it never changes. Get this: you can set the two wheels to work backwards. (Left-to right instead of right-to-left.) What for?
It seems utterly pointless. But you cannot set the two wheels to do the same things in manual mode as they do in aperture priority! Most serious photographers basically only use two modes: M and Av. (For some special purposes, such as propeller-driven aircraft, you use Tv.) But 90-something percent of photographers use either manual exposure or aperture priority, and (at a guess) more than half of us use both. (I'm not counting people who only use auto as "photographers" here.)
So in Av, you adjust the aperture with the top dial, and exposure compensation with your thumb. But in M you adjust the aperture with your thumb and if you move the top dial it changes the shutter speed on you! And you can't change it! This is dumber than dumb, and they still haven't fixed it. Every non-pro Canon body, even the 5D IV, retains this asinine design fault.
(Or maybe it's smarter than dumb. The Canon pro models can all be set to do it the right way round. Maybe they think people will spend the extra $5000 just to avoid the annoyance. And lord help me, they might be right - every time I ponder buying a 5D IV, I wind up thinking about a 1DX II instead!)
EDIT: I've just discovered that the 7D II (and perhaps some other models too) now DOES let you fix this. I couldn't find it in the manual because they put it in a different place where I would never have thought to look for it. Glory be!
So what bugs you?