Archived posting to the Leica Users Group, 2009/01/15

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Subject: [Leica] Question about M8 exposure
From: hoppyman at bigpond.net.au (Geoff Hopkinson)
Date: Thu Jan 15 13:38:12 2009
References: <10E9486C0AA54E73AC3661023A10551D@precisionm50><C59541F8.1F8B7%lug@steveunsworth.co.uk><9F0FEF7598E2461CB326C90B27A59004@dadquad> <7ac27f4f0901151324y31f96c03xeb8a4ad10fc9f47e@mail.gmail.com>

Wee-el I did mention it. But this is a startling claim you have made! A
sensor is a linear device. All of the voodoo is after the buckets fill up
with photons!
I shall say no more, for I fear that Dr Theodore may jump on me for being
too geeky. Sheesh, Hoppy should be out taking photos! 


Cheers
Geoff
http://www.pbase.com/hoppyman/e
http://gallery.leica-users.org/v/gh/
Pick up your camera and make the best photo you can.

-----Original Message-----
Subject: Re: [Leica] Question about M8 exposure

Geoff, a major factor that you have not discussed is that digital sensors
are not linear device - that is, a sensor may have better response in
certain range (e.g. midtone) than others. The conversion from this "native"
characteristics of the sensor to the "RAW" output, is one of the secret
sauces of the camera maker.

On Thu, Jan 15, 2009 at 12:59 PM, Geoff Hopkinson
<hoppyman@bigpond.net.au>wrote:

> Steve I think that there are several issues confused there. The 
> original linear information captured must be conform to the fundamental
principle.
> Half of total are used the represent the first (brightest) stop, one 
> quarter the next, one eighth the next, one sixteenth the next etc. Up 
> to a reported
> 81/2 stops of maximum dynamic range for the DNG.
>
>
--
// richard m: richard @imagecraft.com
// b: http://rfman.wordpress.com

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In reply to: Message from leica at web-options.com (Bob W) ([Leica] Question about M8 exposure)
Message from lug at steveunsworth.co.uk (Steve Unsworth) ([Leica] Question about M8 exposure)
Message from hoppyman at bigpond.net.au (Geoff Hopkinson) ([Leica] Question about M8 exposure)
Message from richard.lists at gmail.com (Richard Man) ([Leica] Question about M8 exposure)