[Leica] m10-R and uncoded lenses

[Marty Deveney]

The in-camera software definitely adjusts vignetting and colours in the
corners.

Here: https://leica-camera.com/en-AU/photography/m/m-system-service Leica
says "These markings help digital Leica M-Cameras recognise the lens type
and optimise the image quality."

My MM, M246 and M10M all display[ed - I don't have them all anymore] a much
higher frequency of hanging up on start-up with uncoded lenses.  This was
described widely across the internet including by DigLloyd, with a specific
recent mention about this phenomenon on the M11.

Coded lenses work better on digital Ms, sadly, it's part of the price of
entry unless you want to spend your time manually fixing every file,
designing your own profiles or looking at vignetted, smeary corners with
weird colours from every photo taken with a 35mm or winder lens.

Marty




On Wed, Dec 14, 2022 at 6:20 PM Frank F via LUG <lug at leica-users.org> wrote:
>
> My understanding is:
> The corner color smearing is optimized by the micro lenses ( a kind of
> filter that fits over the glass cover plate over the sensor).
> I have yet to find any official or competent reviewer statement that says
> the Maestro or other processor inside the camera performs any corner color
> corrections.
>
> Please correct me if I'm wrong
>
> Note that KolariVision modifies Sony cameras with an ultra thin glass
cover
> plate to minimize the color shifts in the corners when using M lenses on
> the Sony body.
>
> On Tue, Dec 13, 2022 at 9:22 PM Peter Klein via LUG <lug at leica-users.org>
> wrote:
>
> > It's not hype, but it may or may not matter for you.
> >
> > You can use most lenses uncoded and you will be fine. But the
> > corrections do correct color shifts in the corners and edges of the
> > frame. The shifts are only noticeable with lenses of 35mm and wider. And
> > with 35s, the shift is often so slight most people wouldn't notice. The
> > in-camera correction is a compromise between wider apertures where the
> > shift is more prominent, and narrower apertures, where it is less
> > noticeable. All digital cameras have some corner color shifts--it has to
> > do with the angle of the light hitting the sensor. It's just that modern
> > DSLRs and "mirrorless" models read the chip in the lens and correct
> > automatically. With Leica lenses, there's no chip with "who am I?"
> > information, hence the six-bit codes.
> >
> > You might want to manually select a Leica lens in the camera menus for
> > uncoded lenses wider than 35mm.
> >
> > 50mm and longer, it doesn't matter unless you want the vignetting
> > corrections. For 35mm, slight cyan corner tints in shots at wide
> > apertures may occur. They bother some people, but not others. At 28mm or
> > wider, you probably will want to set the camera for a lens of that focal
> > length if you shoot color. If the camera has your lens in its menu use
> > that. If not, select something of the same focal length.
> >
> > Hope this is helpful.
> > --Peter
> >
> >
> >  > Quoting Frank Filippone:
> >  >
> >  > >
> >  > > Nothing will happen.
> >  >
> >  > That's what I figured. I suspected it was all or mostly hype. Thanks
> >  > for confirming.
> >  >
> >  >
> >  > > What do you think of your choices?
> >  >
> >  > I like just putting the lens on the camera and taking pictures best,
> >  > as I've been doing since about 1970. It sounds like I can do this and
> >  > the results will be at least as good as my film Leicas. I've lived
> >  > without EXIF data this long; I think I can manage to do so the rest
of
> >  > my days. I have a slew of Leitz lenses going back to the 1930's, none
> >  > six-bit coded, and all of which I like, even the Summar, the Rodney
> >  > Dangerfield of Leitz lenses.
> >  >
> >  > Thanks for your help.
> >  >
> >  > Howard
> >
> > _______________________________________________
> > Leica Users Group.
> > See http://leica-users.org/mailman/listinfo/lug for more information
> >
> --
> Frank Filippone
> BMWRed735i at gmail.com
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information