Archived posting to the Leica Users Group, 2013/10/04

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Subject: [Leica] Blind cats.... and image dabases?
From: afirkin at afirkin.com (afirkin at afirkin.com)
Date: Fri, 4 Oct 2013 03:25:39 -0400
References: <D081BEA2-0FD5-4700-95E9-F125B060C7E1@acm.org><CAAsXt4OyjVt4N5Cx4fgjYkbSN5Lo37iVPXC=O_3FppC62BFBCA@mail.gmail.com><80F9701439F20347874CE5E4E03C22E9CDE2ACC3@WhizzMAIL01.whizz.org><0171C3C9-D25D-4852-BBAA-03695B57B4B6@acm.org> <CAFfkXxtu5PQd7fwSWE9Pmij-CgfwL0-1EpU+wygd64HmZ=N4EQ@mail.gmail.com> <33206392DB0D48678BEB01F33E583A49@Family>

Don't know about the database sorry, but when we had a reunion, I scanned
all the images of us starting medicine, projected them on a screen on the
evening and as people arrived, I took shots of them standing beside the
hopeful first year med student and then projected the combined output.
Made for a lot of fun, allowed everyone to recognize each other and added
a dimension to the 'year book'

Cheers

Alastair

> Blind Cats
> I note, like all cats, it knows where the food is :-) Our cat Kofi - 16
> year
> old Siamese derivative - has suddenly gone blind, walks into doors, is
> very
> hesitant coming down stairs, and is totally useless with his allotted
> household task - catching mice. The house is now crawling with the small
> furry thingies, so action had to be taken and it now resembles a mousetrap
> display store. My wife detests seeing the wee, sleekit, cow'rin', tim'rous
> beasties alive or dead and I have to dispose of them covertly. The varying
> baby Madame Guillotines snapping noisily during the night played hell with
> my sleep and I bought poison recently. Now they die quietly and instead
> disturb my sleep with the waft of putrefaction as they silently rot under
> the bedroom floorboards....
>
> Image Databases
> Has anyone used Access 2003 for an image database. I'm organising a 45
> year
> reunion dinner and want to do name badges as most of us won't recognise
> each
> other under the heavy mask of aged decrepitude.
>
> I have scanned three group images covering the 160 odd pupils from an old
> 1968 yearbook, and am now extracting 160 individual pictures into a
> separate
> directory. I want to create a picture field in the database that either
> contains the image or its link. Then I hope to extract the  picture,
> firstname, and surname fields onto a label and make up 160 badges with the
> labels. Anybody any experience of this?
>
> Thanks
>
> Douglas
>
>
>
>
> ----- Original Message -----
> From: "Sonny Carter" <sonc.hegr at gmail.com>
> To: "Leica Users Group" <lug at leica-users.org>
> Sent: Thursday, October 03, 2013 12:25 PM
> Subject: Re: [Leica] Auto ISO
>
>
>> First argument I ever got into in the LUG was over the black cat thing.
>> At
>> the time, I think I was the only person with a black cat.  It depends on
>> the circumstances.
>>
>> http://www.sonc.com/belinna_guards.htm
>>
>>
>> On Thu, Oct 3, 2013 at 1:34 AM, Herbert Kanner <kanner at acm.org> wrote:
>>
>>> That's where you use exposure compensation. Shoot a white swan:
>>> increase
>>> exposure by compensation or any automatic system will want it to be
>>> gray.
>>> Shoot a black cat and decrease exposure for same reason.
>>>
>>> Herbert Kanner
>>> kanner at acm.org
>>> 650-326-8204
>>>
>>> Question authority and the authorities will question you.
>>>
>>>
>>>
>>>
>>> On Oct 2, 2013, at 12:00 PM, John McMaster <john at mcmaster.co.nz> 
>>> wrote:
>>>
>>> > I cannot see how it would? There I am putting an exposure in for a
>>> silhouette and the camera thinks "that's underexposed" so ups the ASA 3
>>> or
>>> 4 stops....
>>> >
>>> > john
>>> >
>>> >> -----Original Message-----
>>> >>
>>> >> I'll have to read again, but I don't think AutoISO works on pure
>>> >> manual
>>> >> mode...
>>> >> Would you double check also?
>>> >> Thanks Herb,
>>> >> Bob
>>> >>
>>> >>
>>> >> On Tue, Oct 1, 2013 at 9:30 PM, Herbert Kanner <kanner at acm.org>
>>> wrote:
>>> >>
>>> >>> I thought a few words about how this function operates on Leica, at
>>> >>> least on the M9, might be useful to y'all, since the Leica Manual
>>> is
>>> >>> not the clearest on this subject.
>>> >>>
>>> >>> Let's start with an understanding of the relationship between the
>>> >>> three
>>> >>> parameters: ISO, f-number, and shutter speed. We are used to
>>> thinking
>>> >>> of exposure having one degree of freedom for a correct exposure.
>>> That
>>> >>> is because we are used, from years of experience with film, of
>>> >>> thinking of ISO being a constant. You can't change ISO in the
>>> middle
>>> >>> of a roll of film. So, for any situation, there is one degree of
>>> freedom for a
>>> >> "correct" exposure:
>>> >>> you change shutter speed, you have to change aperture, and vice
>>> >>> versa.
>>> >>> Hence, for the little all-electronic cameras where both the
>>> aperture
>>> >>> and shutter are under computer control, you can choose the aperture
>>> >>> (aperture preferred), or you can chose the shutter speed (shutter
>>> >>> speed preferred) and the camera choses the one you didn't chose.
>>> You
>>> >>> all know this; I'm just being pedantic.  Oh, then these idiot
>>> cameras
>>> >>> have "programmed" mode where the camera chooses both based on
>>> >> some arcane set of rules. That's for bozos.
>>> >>>
>>> >>> Now, lets look at the Leica. The camera can control the shutter,
>>> but
>>> >>> it can't control the aperture. So the only automatic mode would
>>> >>> appear
>>> >>> to be aperture preferred. Ah, but the ISO is under the control of
>>> the
>>> >>> camera's computer. It is now a third variable: it can be changed at
>>> >>> any time. So, Leica in its wisdom invented Auto ISO. Now we have
>>> two
>>> >> degrees of freedom.
>>> >>> That is, we can pick the values of any two: say ISO and aperture,
>>> and
>>> >>> now the shutter speed is determined. Thus, on the Leica, we now
>>> have
>>> >>> a
>>> >>> way of doing shutter speed preferred: set the shutter to the speed
>>> >>> you
>>> >>> want, set the aperture to the f-number you want, and the camera
>>> will
>>> >>> pick an ISO that gives the correct exposure. So, what happens if
>>> you
>>> >>> set Auto ISO and aperture preferred on the M9? You will be in s
>>> >>> situation similar to program mode in a point and shoot. The camera
>>> >>> will chose both the shutter speed and the ISO value. I took a few
>>> >>> shots at three consecutive stops on the dial, and the shutter speed
>>> >>> sat at 1  /150, perhaps not what I would want with a 90mm.
>>> >>>
>>> >>> If you set a shutter speed and an f stop with Auto ISO, everything
>>> >>> works fine as long as the ISO that gives "correct" exposure is in
>>> the
>>> >>> available ISO range. And you can use exposure compensation. What
>>> you
>>> >>> lose is any information about exposure in the viewfinder. What
>>> >>> information could that be? The ISO the camera selects, of course.
>>> >>>
>>> >>> One warning: the little dot and triangles used for manual exposure
>>> >>> setting seem to be meaningless with Auto ISO: just ignore them.
>>> >>>
>>> >>> Herbert Kanner
>>> >>> kanner at acm.org
>>> >>> 650-326-8204
>>> >>>
>>> >
>>> >
>>> > _______________________________________________
>>> > 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
>>>
>>
>>
>>
>> --
>> Regards,
>>
>> Sonny
>> http://sonc.com/look/
>> Natchitoches, Louisiana
>> 1714
>> Oldest Permanent Settlement in the Louisiana Purchase
>>
>> USA
>>
>> _______________________________________________
>> 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
>




Replies: Reply from imra at iol.ie (Douglas Barry) ([Leica] Blind cats.... and image dabases?)
In reply to: Message from kanner at acm.org (Herbert Kanner) ([Leica] Auto ISO)
Message from rgacpa at gmail.com (Robert Adler) ([Leica] Auto ISO)
Message from john at mcmaster.co.nz (John McMaster) ([Leica] Auto ISO)
Message from kanner at acm.org (Herbert Kanner) ([Leica] Auto ISO)
Message from sonc.hegr at gmail.com (Sonny Carter) ([Leica] Auto ISO)
Message from imra at iol.ie (Douglas Barry) ([Leica] Blind cats.... and image dabases?)