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Re: [OM] RANT: Sample images taken with EP-1

Subject: Re: [OM] RANT: Sample images taken with EP-1
From: "Wiliam Wagenaar" <wiliam@xxxxxxxxx>
Date: Fri, 19 Jun 2009 23:34:06 +0200
Thanks Ken, that actually made sence.

Now, would it be possible to add some sort of fine grain to the sensor
so the reflected light is acattered as with film , but the light
entering the sensor still produces a sharp and crisp image? Otherwise I
see your live reading option as best feasible in the near future.

Wiliam

> -----Oorspronkelijk bericht-----
> Van: Ken Norton [mailto:ken@xxxxxxxxxxx] 
> Verzonden: vrijdag 19 juni 2009 19:47
> Aan: Olympus Camera Discussion
> Onderwerp: Re: [OM] RANT: Sample images taken with EP-1
> 
> 
> >
> > I really do not see why. Sure, the sensor should not reflect much 
> > light, but how hard can it be to compute the amount of 
> light that has 
> > fallen onto the sensor when you know how reflective it is? Even if 
> > reflection is only .1% this seems verye feasable to me. For 
> me It is 
> > still a big miss in all DSLR's, especially coming from Olympus.
> >
> > Someone care to elaborate?
> >
> 
> 
> It is actually quite difficult as the sensor is more "mirror 
> like" than film. Film has a very smooth scattering effect 
> (matte surface) and is easy to measure and gives consistent 
> meter readings regardless of the position of the light in the 
> picture or whether the bright spots are small or large.
> 
> A sensor, being more mirror like, doesn't have this 
> scattering effect and is a high gloss surface. As such, the 
> position and diameter of the bright spots in the image are 
> neither predictable or consistent.
> 
> For example go into your bathroom with a flashlight (torch). 
> Turn the lights off and look at the mirror. Now take the 
> flashlight and point it at the yourself in the reflection.  
> Notice how bright the flashlight is?  Now point it elsewhere 
> at the mirror.  The reflected light is much dimmer because it 
> is no longer pointed at your face.  Now, turn around and face 
> the bathroom wall. Do exactly the same thing by pointing the 
> flashlight directly in front of you and then to the side a 
> bit. The brightness remains about the same (depending on paint type).
> 
> This is what is happening inside the camera. A light-reading 
> sensor in the floor of the mirror-box is pointed at the 
> imaging sensor. But since the imaging sensor surface is 
> mirror like, the light-reading sensor ends up seeing the 
> bottom of the mirror and none of the light coming through the lens.
> 
> The only practical solution is to live-read the imaging 
> sensor. I suspect that the next generation of live-view 
> imaging sensor will be shutterless. Without a shutter, the 
> sensor will receive a purge command at the start of the 
> exposure and then will dump to the interline rails at the end 
> of the exposure.  Or the sensor will have a fixed read rate 
> of 1000 frames per second and exposures longer than that will 
> be a cumulative stack of images for the duration of the 
> exposure. As the sensor requires no shutter and light-levels 
> are read dynamically off the main imaging-sensor, there is no 
> need for a parallel light-reading sensor system.
> 
> Or another possiblity is a hybrid sensor--one where there are 
> pixels scattered throughout the imaging-sensor and read and 
> cleared at a high rate as compared to the imaging pixels 
> which are more traditional.
> 
> AG
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