Web Analytics RiceHigh's Pentax Blog: Sensor Performance Analyses on RAW: 5D Vs 5D2 Vs 7D Vs K-5

Wednesday, December 01, 2010

Sensor Performance Analyses on RAW: 5D Vs 5D2 Vs 7D Vs K-5

See the following article in Spanish:

http://www.guillermoluijk.com/tutorial/noisedr/

(Google-translated English page here)

The Signal-to-Noise Ration (SNR), Level of Saturation (for 12-bit Vs 14-bit), Dynamic Range (DR, in EVs) etc. are measured. This is an interesting read (but maybe a bit more difficult) and the comparisons are made on the same methodologies and bases.


Related:-

K-5 Scores the Same DxOMark as the 645D!

Falk Lumo Tested the D700, D5000 and K-x

K-x' DxO Mark is Out
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garedagmad's avatar

garedagmad · 745 weeks ago

Did you notice that he points out that there is NO evidence of NOISE REDUCTION in RAW, at least from ISO80 to ISO1600 ?
2 replies · active 745 weeks ago
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RiceHigh's avatar - Go to profile

RiceHigh 110p · 745 weeks ago

No and thanks for pointing this out. But so.. What do you want to point out then?
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garedagmad's avatar

garedagmad · 745 weeks ago

I think to have read comments about NR in RAW for K-5... but I have just checked they were from DxO sensor review on ISO from 3200. They called it "smoothing". So both analysis are compatible... sorry for suggenting meaning more than that.
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Dimitri's avatar

Dimitri · 745 weeks ago

i suggest you evaluate carefully the LOWEST graph concerning Canon 40D and compare it with the whole bunch.
Beware of 14 (NOT 12 as in the most graphs) divisions on the EV scale ;-)

I must admit, that my experience with testing both K5 and D7000 and comparing with 40D in real life (hand held, low light shooting) in regard to IQ and per pixel sharpness of the resulting images was quite sobering. Both K5 and D7000 are gone back and i am keeping my 3 y.o. 40D

I think, we are all still easily fooled by camera manufacturers, who are really not doing theire best to develope better cameras...
3 replies · active 745 weeks ago
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Erika's avatar

Erika · 745 weeks ago

"I think, we are all still easily fooled by camera manufacturers, who are really not doing theire best to develope better cameras..."

There are technical limitations. More megapixels will generate more noise (because each pixel is smaller), and place higher requirements on the lens and focus quality. Naturally that it will be visible when pixel peeping the images.
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Dimitri's avatar

Dimitri · 745 weeks ago

Then why do they crank up the MP-count?
Why not invest in the development of high quality 12MP Sensors and better lenses?
Look at 12 mp images GF1 + 1.7 20mm combo, they are great!
In low light handheld shooting wide open at 1.7 and 1/30s they give at 400-800 ISO better images as i could get with D7000 DX 35mm f1.8 combo!
B/C you have to set at least f2.8 or better F4 (actually f5.6-8 optimally) to get sharp image with DX 35mm f1.8 AND you need at least 1/60-1/100s shutter speed with D7000 handheld. For this setting you easily get ISO1250-2000 on D7000 (or K5) and then look at the resulting SOFT and NOISY images!!!

Why not make larger sensors? Is a FF-Sensor produced in the same quantities as APS that much priecier?
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risinsun's avatar

risinsun · 745 weeks ago

I have to agree... This is called marketing! :-)
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j viviano's avatar

j viviano · 745 weeks ago

The problem is the assumption that twice the mega pixels will let you blow up an image twice as large. This is not true, but you can blow it up a little more.

If you follow this rule, the increase in MP would be helpful. I still believe that 12MP is enough though, and would prefer ultra-sharp and clean high ISO from 12MP.
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garedagmad's avatar

garedagmad · 745 weeks ago

You can perhaps find interesting this related article, from the same author, on the same sensor: http://www.guillermoluijk.com/quickwin/perfect/in...
1 reply · active less than 1 minute ago
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illdefined's avatar

illdefined · 745 weeks ago

Rice has no interest in this article, it is well-researched and extremely complimentary and positive of the K-5.
He won't read it, much less post it, this blog is only about the negative of Pentax.

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