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Thread started 07 Nov 2010 (Sunday) 16:43
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My gosh! The Pentax K-5 has ridiculous dynamic range! (Sample shot linked)

 
996gt2
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Nov 07, 2010 16:43 |  #1

Download this RAW file from the Pentax K-5 and open it in Camera Raw:

http://www.multiupload​.com/4TQCIKGKQS (external link)

Set exposure to +4, fill light to 100, brightness to 100.

Sit back and enjoy :)

Original file:

IMAGE: http://img822.imageshack.us/img822/9955/k5original.jpg

On another note, the Nikon D7000 has a very similar (if not identical) Sony sensor and should thus have very similar DR performance.

After Camera RAW:
IMAGE: http://img442.imageshack.us/img442/1838/k5edited.jpg

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Hardcore
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Nov 07, 2010 17:00 |  #2

Wow, that is amazing... I love this kind of stuff. It will push canon to deliver the goods next time when it comes to Dynamic range!


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996gt2
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Nov 07, 2010 17:00 |  #3

Sorry I posted this in the lenses section. Can a mod move it to EOS cameras or something?


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Nov 07, 2010 17:04 |  #4

It is not an EOS topic either, and there is already a pentax vs other cameras thread. It might have been good to add it to that thread maybe?


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rx7speed
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Nov 07, 2010 17:50 |  #5

now for my next trolling question. so where is the banding that you get for taking a user error shot like this since we all know any camera with this much user error is going to have banding :p.

but in all honesty how is the noise, banding with a push this hard?


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996gt2
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Nov 07, 2010 18:13 |  #6

rx7speed wrote in post #11242417 (external link)
now for my next trolling question. so where is the banding that you get for taking a user error shot like this since we all know any camera with this much user error is going to have banding :p.

but in all honesty how is the noise, banding with a push this hard?

Download the RAW file and try for yourself :)


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rx7speed
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Nov 07, 2010 18:37 |  #7

it hasn't been letting me. keeps saying too many downloads from 1 IP and so it won't let me.


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DStanic
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Nov 07, 2010 18:45 |  #8

That's pretty impressive, lots of noise obviously but little to no banding and color noise cleans up to a somewhat usable image in LR3.

So that was shot at ISO80, I'd be curious to see such a severely underexposed shot at say ISO800 or 1600.

K5 looks like not a bad camera.


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John ­ Sheehy
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Nov 07, 2010 19:14 |  #9

996gt2 wrote in post #11242181 (external link)
Sorry I posted this in the lenses section. Can a mod move it to EOS cameras or something?

Well. maybe it isn't as off-topic as you might first think, because now the question is, how do I get my Canon lenses to work on this thing?

That image is about 8.5 stops under-exposed; the brightest highlights in the RAW are about 21 RAW levels above black, out of about 16,536 levels! That's more than 9 stops below saturation! What little noise is there cleans up very easily with Topaz Denoise, without losing detail at that downsize.

This camera is supposed to be better than any existing APS-C at high ISOs, as well. The other brands that use this sensor should all do well at high ISOs, even if they have only 12 bits. Canon IQ superiority is history, in every regard. Imagine a 36MP FF camera full of these pixels!




  
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John ­ Sheehy
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Nov 07, 2010 19:18 |  #10

rx7speed wrote in post #11242417 (external link)
now for my next trolling question. so where is the banding that you get for taking a user error shot like this since we all know any camera with this much user error is going to have banding :p.

but in all honesty how is the noise, banding with a push this hard?

Just what you see; just a trace of light, fine banding, way, way down (this kind of push would be dominated by banding on a 7D or 5D2). This image is about ISO 30,500, pushed from ISO 80.




  
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MGiddings ­ Photography
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Nov 07, 2010 19:25 |  #11

Well that does look impressive. I wonder how it will perform under normal conditions. Will be nice to see a review asap.


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evilr00t
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Nov 07, 2010 21:43 as a reply to  @ MGiddings Photography's post |  #12

These results remind me of this:

http://theory.uchicago​.edu …ests/noise/nois​e-p3a.html (external link)

Did Pentax implement the dual gain readout? Perhaps so!

Background:
The dynamic range in most CMOS DSLR sensors of the 20D era and later is about 13.3-14 stops. This value is from the saturation value (= maximum number of photoelectrons countable before clipping) divided by the read noise (= minimum number of photoelectrons countable before encountering noise)
But why don't we see the entire dynamic range the sensor is capable of? The electronics prevents one from actually extracting it from the sensor. At low ISOs, read noise is high -- meaning the shadows turn noisy, losing the shadow portions of the dynamic range. At high ISOs, clipping lops off the highlight portions of the dynamic range.

I suspect this is why the 7D/5D2 have low ISO noise issues - the read noise is high compared to the maximum signal due to small saturation values (due to small pixels).

The solution posed by the article is to read each pixel twice - one at low gain to not lose highlights, and one at high gain to minimize readout noise. Then, merge the two images. Could this be what Pentax is doing? It certainly seems likely - the sensor's dynamic range (~14.1 EV, according to DXO) is about the same as what would be predicted from using a APS-C sized sensor.

Given the DR from DXO and estimating the saturation value from the D300's sensor, the read noise on the Pentax sensor is roughly 1.8 electrons - a value close to the best that the 1D4 can achieve (1.7e). However, the 1D4 only achieves 11.7EV of DR (according to DXO). This is because of the performance at low ISO, where the 1D4's read noise increases from 1.7e at ISO 12800, to 22.2e at ISO100. The Pentax seems to suffer no such penalty; you have seen this in the RAW file linked in the OP; if you try this with a 1D4 raw, you will get something... ugly.


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bohdank
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Nov 07, 2010 21:56 |  #13

Impressive.


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ccp900
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Nov 07, 2010 22:44 |  #14

wow...

nikon has been delivering the goods body wise with their new found paradigm of giving the consumers pro features and now pentax is making cameras that can do 9 stops of dynamic range one way?

and canon is still in the "you cant have this feature because its a 1d feature" mentality..along with "but we have more pixels" reasoning.

exciting times we are living in....i hope canon comes out to play.


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themadman
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Nov 07, 2010 22:48 |  #15

Cool but this has nothing to do with EF/EF-S lenses... sigh... lets this kind of DR on our Canons =)


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