I haven't taken apart any camera but as you described I would think the Canon is poorly engineered as compared to the Pentax. If you design something that is easy to build, easy to fix and reliable then it's good engineering. It usually takes more work to come up with the simpler design.
You really need to talk to the designers to get answers to your questions so I can only speculate. Perhaps the Canon engineers had some goal of higher precision in mind when they designed the workings of their cameras. Perhaps they were so geeky in their design that they didn't think of the needs of the repair people.
You see this same sort of thinking all the time -- Auto designers who put parts that will obviously need regular changing -- oil filters, for example -- in a location that only an orangutan could love. Computer programmers who write long series of commands to do simple tasks because the need to do so is obvious to them, but nobody else which is why we all long for the "just do it" button.
And sometimes engineers just build on the past, adding features/complexity without thinking that maybe it's time to toss out the old and start new from scratch. The chief designer for Olympus, whose name escapes me, was famous for doing that, and his cameras showed it.
That's why so many cameras, for so long, used a shutter design similar to the Leica M/barnack cameras -- simple, precise, easy to fix.
I was a apprentice trained mechanical engineer in my youth worked for thirteen years at a company who made turbine blades for Rolls Royce jet engines and although I have all the workshop manuals for my cameras the more I look at them the less I feel inclined to attempt to service them.This is how I feel. I don't see the Canon in your original example as over-engineered, but as under-engineered. And having a mechanical engineer as a dad, I was raised with the idea that there's no such thing as "over-engineered." And he bought a Pentax H1a (pre-Spotmatic). Since I'm still using that camera 50 years later, I think it was engineered well. My electronic cameras have given me more issues than that one.
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Another cause is patents. Again, you'd have to ask the designers for sure. Many things are made complicated to avoid patent infringement. In todays world, that's the appeal of free open source software. You make new things using simple software tools whose patents have expired.
This is how I feel. I don't see the Canon in your original example as over-engineered, but as under-engineered. And having a mechanical engineer as a dad, I was raised with the idea that there's no such thing as "over-engineered." And he bought a Pentax H1a (pre-Spotmatic). Since I'm still using that camera 50 years later, I think it was engineered well. My electronic cameras have given me more issues than that one.
HakonJ;1632653While studying mechanical engineering said:Yes, and this seems to be validation for Pentax taking four years in order to bring such a 'simple' design to market.
(Now, if only APUG could guarantee that nice grey background for quotes on a consistent basis!) - David Lyga
Proberly maintained the Canon probably wipes the floor with the simplier Spotmatic shutter in terms of precision.
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