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Re: [OM] E-5 vs GH2 sensor

Subject: Re: [OM] E-5 vs GH2 sensor
From: David Irisarri <zuiko3000@xxxxxxxxx>
Date: Thu, 16 Sep 2010 16:04:10 -0400
Hi Chuck,

One way of calculating dynamic range is by means of f-stop noise. Dynamic
range is typically specified as the range of tones over which the RMS noise,
measured in f-stops (the inverse of the signal-to-noise ratio, SNR), remains
under a specified maximum value. The lower the maximum noise (the higher the
minimum SNR), the better the image quality, but the smaller the
corresponding dynamic range. SNR tends to be worst in the darkest regions.
Imatest calculates the dynamic range for several maximum RMS noise levels,
from 0.1 f-stop (high image quality; SNR = 10) to 1 f-stop (low quality; SNR
= 1).

Sorry if I was wrong but I though noise was related with dynamic range.

Thank you for your comments.

Dave

2010/9/16 Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>

> You're confusing ISO rating with dynamic range.  Not the same thing at
> all.  Your rumor mill link only talks about a 1 stop ISO increase.  Easy
> to do by turning up the amplifiers but it doesn't necessarily lead to
> much improvement in output.  The images could be shot full of noise.
>
> I think Olympus would do well to go back and do business with Kodak.
> Kodak at least does not seem bent on competing in the 4/3 and larger
> sensor size camera market.  I've always thought that for Olympus to do
> business with much bigger and wealthier Panasonic was pretty dangerous
> and basically a one sided proposition in favor of Panasonic.  Watch out
> who you play with.
>
> Chuck Norcutt
>
>
>
> On 9/16/2010 10:18 AM, David Irisarri wrote:
> > Hi all,
> >
> > I am very curious of why Olympus decided to use an old 12.3 MP sensor in
> > their flagship camera. Using their PRO fine-tuned TruePIC engine has
> > increased just only 1/2 stop vs E-30. Today I have read Panasonic with
> their
> > new forthcoming GH2 camera 18 MP sensor has increased dynamic range by 1
> > stop. Olympus has deleted all the ISO E3/E5 comparation around the WWW
> and
> > they even deleted E-5 video created by DSRL Magazine in Spain! E-5
> quality
> > was worse than E-3! Wow, I think they aren´t too convinced with the
> camera.
> >
> > http://www.43rumors.com/ft4-more-small-panasonic-gh2-details/
> >
> > If it´s true Panasonic has managed to increase their new sensor by 1
> stop!
> > and outputting 18 MP, E-5 will be dead before being launched to the
> market!
> >
> > I wonder how is the relationship between Panasonic and Olympus. Why
> Olympus
> > didn´t use a Kodak sensor with broader dynamic range? I wouldn´t mind
> having
> > seen an E-5 with 10 MP, 15 stops DR and a new color engine. If Olympus
> > releases a new PEN with the new Panasonic sensor, quality will be much
> > better than E-5! Can you believe it?
> >
> > Obviously something is going on inside Olympus headquarters. They aren´t
> > interested in FF anymore. They only sell slow MFT lenses. Tons of
> chromatic
> > aberration in their lenses. They created a ZD 14-54 KM-II for nothing.
> > Meanwhile have a look to Panasonic MFT lenses.
> >
> > David
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