[Leica] IMGS: B&W
Ken Iisaka
ken at iisaka.com
Wed Mar 6 16:31:32 PST 2019
An interesting description of the light, but not quite.
The speed of light is constant in vacuum, regardless of its frequency or
wavelength. However, red is at the long-end of the visible spectrum, at
around 700 nm. It is however true that, due to its longer wavelength, its
airy disc is larger than blue, which is on the short end of the visible
spectrum.
On typical digital cameras, using a red filter does indeed reduce the
resolution. Only one of 4 sensors is able to detect the red light. There
are 2 green pixels per a set of 4, so the apparent resolution is higher
with a green filter. You'd find that if you use a blue filter, the
resolution goes down, even though the wavelength is shorter, thus there is
less effect from diffraction.
The presence of chromatic aberrations may be another explanation why you
"gain" some resolution from using a color filter.
On Wed, 6 Mar 2019 at 14:13, Mark Rabiner <mark at rabinergroup.com> wrote:
> Red is a slower or slowest wavelength in light. Despite an overall more
> contrast look on pix made with red filters there is a overall lower rez
> feeling I believe for that reason.
> Shooting with green filters makes for an image based on green light which
> is the fastest wavelength in light so there is a higher rez effect. And a
> reason for shooting with a light green, yellow green or darker green filter.
> A light green is said to restore true panchromatic ness as you don’t
> really get it even if it says " panchromatic " it on the box. Which is
> always said on the box till they started taking them off.
> But a reason why I used a lot of black and white filters is because almost
> all of them made it so you could get tone in the sky without under
> exposing. And washed out sky's make for second rate looking images.
> I want sharp looking clouds with some real weight to them!!!?!
>
>
> --
>
> Mark William Rabiner
> Photographer
>
> On 3/5/19, 5:59 AM, "LUG on behalf of John McMaster" <lug-bounces+mark=
> rabinergroup.com at leica-users.org on behalf of john at mcmaster.co.uk> wrote:
>
> It was quite well known at the time, I only tried in 2012 when I first
> got my Monochrom...
>
> john
>
> -----Original Message-----
> From: LUG [mailto:lug-bounces+john=mcmaster.co.uk at leica-users.org] On
> Behalf Of Lluis Ripoll via LUG
> Sent: 04 March 2019 23:17
> To: Leica Users Group
> Cc: Lluis Ripoll
> Subject: Re: [Leica] IMGS: B&W
>
> I will test this as well, did you contacted Leica support about this
> issue?
> Lluis
>
>
> > El 4 març 2019, a les 23:29, John McMaster <john at mcmaster.co.uk> va
> escriure:
> >
> > I tend to use wider apertures, Noctilux with a red filter and I
> never got a sharp (by f1.0 standards) shot! Even an orange on the 21mm
> f3.4 knocked focus out....
> >
> > john
> >
> > -----Original Message-----
> > From: LUG [mailto:lug-bounces+john=mcmaster.co.uk at leica-users.org]
> On Behalf Of Lluis Ripoll via LUG
> > Sent: 04 March 2019 22:07
> > To: Leica Users Group
> > Cc: Lluis Ripoll
> > Subject: Re: [Leica] IMGS: B&W
> >
> > I’ve never identified this problem with the MM, thank you John!
> > Lluis
> >
> >
> >> El 4 març 2019, a les 10:39, John McMaster <john at mcmaster.co.uk>
> va escriure:
> >>
> >> Also coloured filters affect the focussing on the Monochrom, hard
> to get accurate focus with (say) a red filter.
> >>
> >> john
> >>
> >> -----Original Message-----
> >> From: LUG [mailto:lug-bounces+john=mcmaster.co.uk at leica-users.org]
> On Behalf Of Tina Manley via LUG
> >> Sent: 04 March 2019 00:09
> >> To: Leica Users Group
> >> Cc: Tina Manley
> >> Subject: Re: [Leica] IMGS: B&W
> >>
> >> Yes, the MM is totally different from converting color. I,
> however, would
> >> not use actual filters on Leica lenses. Any glass in front of the
> lens
> >> degrades it to some extent and increases the possibility of
> flares. That's
> >> one area that I think digital is better. Take the photo with the
> MM and
> >> apply the digital filter later. That way you still have the
> >> unmanipulated photo and can apply as many or as few filters as you
> want,
> >> after the fact. I really like Nik's Silver Efex for processing B&W.
> >>
> >> Tina
> >>
> >> On Mon, Mar 4, 2019 at 6:50 AM Mark Rabiner <mark at rabinergroup.com>
> wrote:
> >>
> >>> I really think and this shot illustrates it that they way to do
> black and
> >>> white when your shooting digital is to use a digital camera or
> back.
> >>> Digital conversions done later have never quite made it for me.
> Once I see
> >>> them in color I seldom feel like taking all the color out. I
> always know
> >>> the colors are there. Shots I'd converted to black and white years
> later
> >>> when I look at the original raw file again I end up keeping the
> color when
> >>> I photoshop it again.
> >>> I hope the time comes when I can get set up with a Leica
> monochrome or
> >>> other digital black and white sensor and wow start investing in
> filters as
> >>> I don’t know if I can find the ones I used to use. My default was
> the 060
> >>> B+W yellow green. Is B+W still in business it was owned by JSK
> Schneider?
> >>> But I loved a darker green or red for sky shots. And others. But
> the green
> >>> I used the most as they were the only ones which did not turn
> people in to
> >>> creatures from another planet.
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>>
> >>> Mark William Rabiner
> >>> Photographer
> >>>
> >>> On 3/3/19, 12:11 PM, "LUG on behalf of Tina Manley via LUG"
> >>> <lug-bounces+mark=rabinergroup.com at leica-users.org on behalf of
> >>> lug at leica-users.org> wrote:
> >>>
> >>> PESO:
> >>>
> >>> I posted a few B&W's from night markets:
> >>>
> >>> https://pbase.com/tinamanley/image/168874023
> >>>
> >>> And next.
> >>>
> >>> I'll have lots more B&W when I get to some of people working but
> they
> >>> are
> >>> usually such colorful people that I took far more color than B&W.
> >>>
> >>> TIA for any comments.
> >>>
> >>> Tina
> >>>
>
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>
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--
Ken Iisaka
first name at last name dot org or com
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