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Old May 28, 2007, 11:01 AM   #1
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http://www.cameralabs.com/reviews/Ol...10/index.shtml

Scores:
E-410 86%
D80 86%
XTi 85%
Alpha 85%
D40 81%
D40x 79%


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Old May 28, 2007, 4:45 PM   #2
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Note: one final observation is the E-410 does not appear to double its actual sensitivity when the ISO value is doubled. Our exposure at 100 ISO for both the E-410 and Canon 400D / XTi samples was 1/250; therefore the exposures at 200, 400, 800 and 1600 ISO should have been 1/500, 1/1000, 1/2000 and 1/4000 respectively. These were indeed the exposures for the Canon, but instead the E-410 increased its exposures by slightly smaller steps: at 200, 400, 800 and 1600 ISO, it metered 1/400, 1/640, 1/1250 and 1/2500 respectively.
Hmm, that confims Phil's claim that ISO 1600 is really ISO 1250. Phil says its 125, 200, 400, 800, 1250. The above would suggest more like 125, 200, 320, 625, 1250.0 (assuming the exposure is really consistent).

In looking at the pixelmania.nl E-510 review shots, it looks similar. There ISO series was all shot at f8. Shutters were 1/10,1/15,1/30,1/60,1/125. The 1/15 shot is clearly underexposed a bit. But 1/30 at ISO 400 looks the same as 1/10 at ISO 100.

One theory of mine (for the moment) is that it might really be an ISO 80 sensor, which for the first ISO is boosted to 100, but after that is in multiples of 80, i.e., 100, 160, 320, 640, 1280.



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Old May 29, 2007, 3:23 PM   #3
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Hi Ken

I think your possibly onto something - I think the Leica M8's Kodak sensor was doign somethign similar to the E410s at ISo 1250, in that compared to a Canon 5D at ISo1600, the Leica's was pretty close to ISO1250 instead. So I'm wondering if Pana decided to go with a similar outlook to teh sensors design as Kodak did. Now if they offer say an ISO50 to 1250, I'd be happy with that esp with the results that we've seen so far.

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Old May 29, 2007, 4:16 PM   #4
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Now if they offer say an ISO50 to 1250, I'd be happy with that esp with the results that we've seen so far.
I agree. And while a purist might prefer they call ISO 1250 ISO1250, it really doesn't matter to me what they call it. But it would be preferable if it were consistent. If they were really doing it to "cheat" a bit on the ISO, I would think you would just make it 1/3 stop less sensitive accros the boaed (starting with 80 instead of 100). MY understanding is this is one of those standards which isn't really that clearly defined anyway, so that wouldn't really be technically incorrect.

But, I can see where it's a minor nuisance when a full stop adjustment only gives 2/3 a stop. I suppose there are some situations where you want to be able to double the ISO and halve the shutter for example, and get the exact same exposure.

As for the ISOs, Phil has it:
125,200,400,800,1250

At this point I suspect he's about right on the 125 and 1250. Except from the exposures I'm seeing from other tests, I think the compression is all in the early part of the range, between 100-400. I think it may be more like:
125,200,320,640,1250

The one thing I see that seems to be consistent between tests is that fromm 100-400, instead of it inceasing 4x, the shutter speed only increases 3x. And while exposure and metering behavior seems a bit more inconsistent between 100-200 across the tests, the exposures seem pretty consistent between 100 and 400. So, I don't think it's really going 100 to 400; it's going 125 to 375, or 120 to 360, or something close. After that, they seem to behave more normally.

Here are the denominators for the shutter speeds from some of the tests:
13, 20, 40, 80, 160 Pixelmania E-410
10, 15, 30, 60, 125 Pixelmania E-510
15, 30, 50, 100, 200 Imaging Resources SLI series
5, 8, 15, 30, *50 Imaging Resources INI series (*aperture also closed 4.3 to 4.5 )
250, 400, 640, 1250, 2500 Cameralabs

But I agree about the results so far. I would be very happy with them at ISO 1250, especially with the ability to leave NR off. And, for all the obsessing people do about high ISO, the truth is 1250 to 1600 is only 1/3 stop. Rarely is 1/3 stop going to make that much difference.

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Old May 29, 2007, 7:35 PM   #5
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Here's the review of the M8's and its sensor over at LL and specifically the ISO settings and how it compared to the Canon 5D. the Kodak sensor in the M8's base ISo is 160. Here's what I did find on LL M8 review - at the bottom there is a comparison between the 5D's FF CMOS and the M8's 1.3x Kodak and what's funny and similar to what where seeign with the Pana sensor is that at ISOI 1250 the M8 easily matches ISO1600 from the 5D. If that Pana sensor has the same qualities of the Kodak's (which from first samples I think it does to a degree) then we're going to be in for a bit of a treat

http://www.luminous-landscape.com/re...leica-m8.shtml

"The bottom line on noise with the Leica M8, to my eye at least, is as follows. ISO 160 and 320 – no noise whatsoever. ISO 640 – a very small amount of noise which isn't even worth removing. It gives the file character. ISO 1250 – some noise. You can remove it or not. Not a problem, especially in B&W. ISO 2500 – visible noise, but easily cleaned up. End of pixel peeping."

So if we get a very good ISO1250 than thats good news in my book. For the E1+ I think the sensor is goign to have to go to at least ISO2500 - if its good enough for the M8 then its good enough for a PanaleicaOly :G
Cheers

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