[Leica] M10 Monochrom oh yes!

Wed Apr 4 10:05:21 PDT 2018

Yes, the filters reduce the amount of light hitting the individual sensors,
thus the reduced sensitivity. Without the filters, more light reach the
panchromatic sensors of the Monochrom cameras.

On 3 April 2018 at 19:36, Howard L Ritter Jr <hlritter at twc.com> wrote:

> Notwithstanding any other considerations that may have to do with Bayer or
> other filter schemes, isn’t it still true that in any color sensor, because
> each photosite has a monochromatic filter over it, that site will receive
> only one-third (notionally) of the incident white light on it, and greater
> proportions of any non-white mixture – but in any case, lose anything from
> just a bit to a whole lot of the incident light, and therefore have a lower
> average ISO than an unfiltered monochrome sensor?
>
> —howard
>
> > On Apr 2, 2018, at 19:05, Ken Iisaka <ken at iisaka.com> wrote:
> >
> > There are many freely available documents on what Bayer sensors are, for
> > example:
> >
> > https://en.wikipedia.org/wiki/Bayer_filter
> >
> > "Demosaicing", in the simplest term, is an interpolation algorithm and
> has
> > very little to do with "anything blue in the image has to pass through a
> > red then green grid layer first."
> >
> > Here's a description of Foveon sensors, which actually captures blue
> light
> > first, then green then red at last.
> >
> > https://en.wikipedia.org/wiki/Foveon_X3_sensor
> >
> > Because all three colors are captured at the same location, no
> > "demosaicing" is necessary with Foveon sensors. In addition, no
> > "demosaicing" is necessary with monochromatic, or rather, panchromatic
> > sensors, as each pixels capture light from a wider range of wavelength,
> not
> > limited to one "color"
> >
> > All image sensors in use today have a grid layout. Foveon sensors have
> > multiple layers to detect light of different wavelengths. Bayer sensors
> use
> > separate pixels to capture levels of different wavelengths.
> >
> > Here's more explanations about different filter array designs:
> >
> > https://en.wikipedia.org/wiki/Color_filter_array
> >
> >
> >
> > On 2 April 2018 at 15:32, Mark Rabiner <mark at rabinergroup.com> wrote:
> >
> >> If there are so many factual errors then why not show us one? Show us
> how
> >> the Bayer process really works! Otherwise this is just added to the
> list of
> >> crass personal attacks which have compiled over the years from you. And
> >> let's see one of your pictures Ken!
> >>
> >>
> >>
> >>
> >> --
> >>
> >> Mark William Rabiner
> >> Photographer
> >>
> >> On 4/2/18, 5:16 PM, "LUG on behalf of Ken Iisaka" <lug-bounces+mark=
> >> rabinergroup.com at leica-users.org on behalf of ken at iisaka.com> wrote:
> >>
> >>    There are so many factual errors. What Mark describes is Sigma Foveon
> >>    sensors. It has nothing to do with Bayer-layout sensors used by Leica
> >> and
> >>    most other cameras.
> >>
> >>    Just go take pictures.
> >>
> >>    On 1 April 2018 at 03:41, Mark Rabiner <mark at rabinergroup.com>
> wrote:
> >>
> >>> It’s the same speed but it can skip having to pass though various
> >> filters
> >>> first in the RGB Bayer process. It's just direct.
> >>> Makes for a far cleaner final result.
> >>> As I understand it demosaicing means anything blue in the image has
> >> to
> >>> pass through a red then green grid layer first.
> >>> Anything green has to pass though just the red gird layer one first.
> >>> And if it’s a red rose its fairly direct. Should look good.
> >>> A black and white sensor has none of that. No grids. No layers.
> >> Everything
> >>> direct.
> >>> Its keeping it simple stupid. I like that.
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>>
> >>> Mark William Rabiner
> >>> Photographer
> >>>
> >>> On 3/31/18, 12:14 PM, "LUG on behalf of Paul Roark via LUG"
> >>> <lug-bounces+mark=rabinergroup.com at leica-users.org on behalf of
> >>> lug at leica-users.org> wrote:
> >>>
> >>>    On Sat, Mar 31, 2018 at 7:59 AM, chris williams via LUG <
> >>> lug at leica-users.org
> >>>> wrote:
> >>>
> >>>> ...
> >>>>
> >>>>
> >>>> Leica was able to use some kind of sensor made in Belgium that
> >> was
> >>>> strictly designed for monochromatic images.
> >>>>
> >>>> ...
> >>>
> >>>    Yes, but aside from not having an R, G or B filter over the
> >> pixel, the
> >>>    silicon is still the same speed as that under the filters of the
> >> color
> >>>    sensors.  The monochrome's native speed is higher only because
> >> it has
> >>> no
> >>>    color filters over the pixels.  I don't think the Leica foundry
> >> has
> >>> found
> >>>    any breakthrough to increase silicon's native light sensitivity.
> >>>
> >>>    I'm not knocking the monochrome at all.  For street photography
> >> or
> >>> where
> >>>    you don't need a filter, it's truly faster and a great tool for
> >> those
> >>> types
> >>>    of photography.
> >>>
> >>>    Paul
> >>>    www.PaulRoark.com
> >>>
> >>>
> >>>    
> >>>
> >>>    _______________________________________________
> >>>    Leica Users Group.
> >>>    See http://leica-users.org/mailman/listinfo/lug for more
> >> information
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> Leica Users Group.
> >>> See http://leica-users.org/mailman/listinfo/lug for more information
> >>>
> >>
> >>
> >>
> >>    --
> >>    Ken Iisaka
> >>    first name at last name dot org or com
> >>
> >>    _______________________________________________
> >>    Leica Users Group.
> >>    See http://leica-users.org/mailman/listinfo/lug for more information
> >>
> >>
> >>
> >> _______________________________________________
> >> Leica Users Group.
> >> See http://leica-users.org/mailman/listinfo/lug for more information
> >>
> >
> >
> >
> > --
> > Ken Iisaka
> > first name at last name dot org or com
> >
> > _______________________________________________
> > Leica Users Group.
> > See http://leica-users.org/mailman/listinfo/lug for more information
>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>

-- 
Ken Iisaka
first name at last name dot org or com