davesrose wrote in post #17059406
Most mirrorless cameras aren't FF. The only FF mirrorless system is the Sony A7, and most its criticisms is the lack of native lenses. At least Leica is established and offers a full range if you can spend that kind of money.
But you have to separate the debate of sensor size for the debate of advantages/disadvantages with mirrorless bodies.
Whatever sensor size you have, you still get a real advantage in ability to make smaller wide lenses if you can move the lens closer to the sensor.
There are quite a few amazon customer reviews of the micro 4/3 cameras stating they believe their small telephotos equals the large 35mm teles in every way.
That's a completely separate debate - no need to drag in the sensor size war in this thread. Yes, 400/2.8 or "400 equivalent"/2.8 are totally different things. Which is also why some quite cheap P&S or bridge cameras can have quite fast lenses - their real focal length is much smaller than what a full-frame body would require for the same fov.
Olympus is one of the worst offenders of perpetuating this lie by having an overhead photo of a small zoom lens over a large 35mm telephoto lens.
So they may be an offender - but it's not relevant to the DSLR/mirrorless debate. And it isn't relevant to the conclusion that a mirrorless body with a fixed sensor size can have physically smaller wide lenses than a DSLR body with the same fixed size can. All because of the reduced distance between the mount and the sensor.
So fundamentally, I think you're right that manufacturers can make smaller yet faster lenses for the APS/ 4/3rds cameras...but they don't seem to have any incentive for investing in that.
I have never debated the ability to have smaller lenses for smaller sensors. I'm debating smaller lenses for same-size sensors. Because there is no mirror that force the lens to be a big distance from the sensor.
The quality of a Leica lens comes from the Leica skill.
The smaller size of a Leica lens comes from solving a simpler problem with a range finder than with a DSLR.