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Re: [OM] E-5 vs GH2 sensor

Subject: Re: [OM] E-5 vs GH2 sensor
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Thu, 16 Sep 2010 16:08:15 -0400
I won't argue with your definition of dynamic range but will simply 
point out once more that your "source" never mentions dynamic range of 
the sensor, only that it has a 1 stop higher ISO rating.  They are not 
the same.

Chuck Norcutt

On 9/16/2010 4:04 PM, David Irisarri wrote:
> 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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