Originally posted by fs999 Perhaps some parts are the same, but the mirror and the shutter don't have the same size (APS-C versus FF) and the placement and size of the parts and electronics can't be the same too...
Yes, and one thing often overlooked is that digital bodies are often much more durable than their film predecessors. I'd be surprised if a basic camera like the *ist and others in its class back in the mid-'90s-2000's were designed to last much more than an average of 20,000 exposures or so.
That doesn't sound like much today, but that was at least 500+ rolls of film, and the average customer of cameras like that would probably never shoot more than 20 rolls of film through it a year. If you shot more than that, you probably had more than one camera body. At that rate, the camera would last 25-30 years, perhaps (and we all know of plenty that have died before that level of wear and tear). Plastic gears, and other inexpensive, lightweight assemblies couldn't be expected to go the distance like a bigger, heavier, more costly pro-oriented body (for the photographer who would shoot five rolls a film a day).
Early digital bodies wore out their shutters and mirror mechanisms pretty quickly, even if they didn't have to transport film, and were expected to go 50k exposures - because their owners were literally shooting ten times as much as they did with film. Fortunately, those buyers didn't gripe much because they were quickly moving on to higher megapixel, better featured new offerings. But the manufacturers quickly realized they had to come up with more efficient ways to make shutters and mirror boxes last 80-100k exposures.
Those lessons could be transplanted onto a newer issue film body, although there's been no comparable development of film transports for better reliability - and that's where many of the low cost film bodies fell down.