Do mirrorless cams need lens recalibrations?

Ive been advised to recalibrate my dslr lenses as they tend do drift over time. Is this true for mirrorless cameras? And why is Canon behind the times in making a full frame pro mirrorless camera for their existing lens line?

As far as I know, mirrorless cameras don't have any of the focus issues (front/back focus). As far as Canon being behind the times in not offering a full frame mirrorless, well nobody does. To me, a full frame or APS-c mirrorless body kind of defeats the whole purpose of mirrorless. I don't see much point or advantage in sticking a full sized lens on a dinky body.

texshooter wrote in post #14650678
Ive been advised to recalibrate my dslr lenses as they tend do drift over time. Is this true for mirrorless cameras? And why is Canon behind the times in making a full frame pro mirrorless camera for their existing lens line?

Lenses don't "drift over time," although you might bump one too hard.

A mirrorless camera focuses through the sensor rather than from a separate system that must be calibrated to the sensor, so it should not have that problem.

Nobody makes a full-frame pro mirrorless camera yet. The primary reason is because electronic viewfinders are not up to the speed and image quality of an optical viewfinder.

However, I'd expect that in another year or two, they ought to be superior to a Rebel viewfinder, and I expect that's the level we'll first see mirrorless cameras compatible with EF lenses (with adapter).

Sooner or later, EVF technology will be "good enough" even if they are never actually quite as good as an optical viewfinder in all respects. After all, current optical viewfinders designed to accommodate autofocus systems have never been quite as good as the best optical viewfinders in the manual focus days...and most people live with it just fine.

The camera will be somewhat smaller, but not much smaller--probably about the size of a 24x36mm Leica.

crn3371 wrote in post #14650826
As far as I know, mirrorless cameras don't have any of the focus issues (front/back focus). As far as Canon being behind the times in not offering a full frame mirrorless, well nobody does. To me, a full frame or APS-c mirrorless body kind of defeats the whole purpose of mirrorless. I don't see much point or advantage in sticking a full sized lens on a dinky body.

I am no expert, but is the reason for today's DSLR lens to be huge grenade-sized because of the flange distance to incorporate the mirror? So without a mirror, lens would be smaller too.

dingie256 wrote in post #14651091
I am no expert, but is the reason for today's DSLR lens to be huge grenade-sized because of the flange distance to incorporate the mirror? So without a mirror, lens would be smaller too.

No, that only affects lenses shorter than about 45mm, which is the necessary distance. Lenses shorter than 45mm require complex "retrofocus" lens designs that do make them significantly larger (look at the wide angle lenses for the Leica rangefinder camera, which also covers 24x36mm).

But beyond that focal length, the focal distance is naturally longer than needed by the mirror, so that makes no difference. However, fitting a current EF lens to such a camera would require a very simple extension tube type adapter with pass-through circuits.

We would expect that eventually a new lens line would emerge, but a lens adapter would help the transition. The wide angles would be significantly smaller in length and all the lenses would be somewhat smaller in barrel diameter because they would not need focusing systems.

oxymoron

The Leica M9 is a full frame mirrorless camera

Lenses certainly can drift over time...

Cams and Rollers wear and thing may not hit exactly the same spot every time as time goes by.

lannes wrote in post #14651597
The Leica M9 is a full frame mirrorless camera

Duh, every Leica I, II III or M series since 1924 has been mirrorless. Like all the others, the M9 has rangefinder aided manual focusing in place of reflex focusing and does not focus automatically or from the sensor.

FlyingPhotog wrote in post #14651614
Lenses certainly can drift over time...

Cams and Rollers wear and thing may not hit exactly the same spot every time as time goes by.

Well, over decades.

RDKirk wrote in post #14652216
Well, over decades.

Unless you have the Canon 24-70mm F2.8 L, which has a reputation of slipping out of calibration.