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| High iso noise "blind test" - Page 3 | |
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| Posted: Tue Jun 19th, 2012 10:42 |
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21st Post |
Gert
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Squarerigger wrote: I am having a very hard time picking one over the other. In most of the pics, A is sharper if I look at the switch which I assume is the auto or manual mode - has M and A on it. B is sharper if I look at the number 250 on the shutter speed dial. Even though I used liveview and tried to focus at the 125 on the shutter speed, it did not work out that way, and you are right, the A pictures are focused slightly in "front on" the B photos. But, since this was mainly meant as a noise test, you can still see a little more blue noise on the A pictures compared to the B pictures; or perhaps I should say, that in the given light the D3 has a touch more noise in the blue channel than the D800 when down-sampled to 12MP. BTW, the A/M switch decides whether the lens aperture is open or closed.
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| Posted: Tue Jun 19th, 2012 11:05 |
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22nd Post |
Squarerigger
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Gert wrote:Squarerigger wrote:I am having a very hard time picking one over the other. In most of the pics, A is sharper if I look at the switch which I assume is the auto or manual mode - has M and A on it. B is sharper if I look at the number 250 on the shutter speed dial. Thanks Gert, that explains it very well. I pick D3 vs D800 
____________________ -------------------------------------------- Gary |
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| Posted: Tue Jun 19th, 2012 11:07 |
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23rd Post |
Robert
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Squarerigger wrote:So, all you folks with more experience, what am I missing? Look at the noise, not sharpness, the coloured blotches in the black leather area and the gritty colour on the satin chrome. Camera 'B' is much cleaner. I would be very interested to see the originals, before re-sizing the resolution.
____________________ Robert. |
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| Posted: Tue Jun 19th, 2012 11:42 |
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24th Post |
Squarerigger
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Robert wrote:Squarerigger wrote: Thanks Robert, learning more every day.
____________________ -------------------------------------------- Gary |
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| Posted: Tue Jun 19th, 2012 12:24 |
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25th Post |
Ed Matusik
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I'm impressed. May have to rethink my first impulse to not buy an 800. - EdM
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| Posted: Tue Jun 19th, 2012 12:24 |
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26th Post |
Eric
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Gert wrote: Eric wrote:In truth I guessed you got an 800 but I recognised the noise cut off point in camera A as either the D3 or the D700 sensor...I wrongly jumped for the D700.jk wrote:Erik,  Using the D3, as I have for some time, I have come to recognise its cut off point of 2000ISO when using artificial light. In your series it shows this very clearly ....1600 no significant noise....3200 noticeable noise. In daylight or higher kelvin lighting the noise threshold is nearer 4000ISO. For this reason I wanted to see some incandescent low kelvin lighting shots with the D800 before committing to the large files. It needs to be noise free (for me) in long exposure interior shots. At the moment if I need to use really high ISO with interior lighting, I still tripod mount and take 3 identical shots. Place the 3 shots on seperate layers in PS and drop the opacity in the 2nd and 3rd layers to 25% and 40%. This gets rid of most noise. But of course you need to have a static subject! I confess I am still trying to understand why the D800 lost noise on sampling down?
____________________ Eric |
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| Posted: Tue Jun 19th, 2012 13:24 |
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27th Post |
Gert
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Robert wrote: Squarerigger wrote: The D3 is (obviously) at its original resolution, but here is a iso 6400 crop from the 36MP D800. If you would like to see other ISOs, let me know, and if you want the full size image, PM me. Attachment: crop-DSC_0385-6400.jpg (Downloaded 28 times)
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| Posted: Tue Jun 19th, 2012 13:36 |
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28th Post |
Gert
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Eric wrote:
I wouldn't say that it lost noise, it more like the noise is less evident - but i have just posted a iso 6400 crop from the full size file - tell me what you see? My personal theory for why down-sampling would "reduce" the noise goes like this: Noise is a random pattern and when downsampling from 36MP to 12MP it is like combining 3 pixels into one, now imagine one of the pixels has a wrong value and the other 2 is close to good, then we would see number 1 as noise, but when combing the 3 pixels the good values of the 2 pixels would even out the "bad" value on pixel one and the noise would thus be evident. Another way of looking at it is, when down-sampling you will lose some fine detail (12MP cannot represent the same level of detail as 36MP), and if the noise is fine-grained enough then that will be some of the "details" you loose.
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| Posted: Tue Jun 19th, 2012 13:46 |
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29th Post |
Robert
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Gert wrote:The D3 is (obviously) at its original resolution, but here is a iso 6400 crop from the 36MP D800. Thank you Gert, I see now. As I thought the random pixels are much finer and being combined by the Bibble software which I believe is very good at re-sizing/re-sampling, has effectively smoothed the somewhat harsh, gritty D800 noise to something much more acceptable. I like it! Capture at high resolution and display at lower resolution... Neat. I wonder if this would also fix the awful, gritty high ISO noise from the D7000?  Doh! I just saw your second post!
____________________ Robert. |
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| Posted: Tue Jun 19th, 2012 13:46 |
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30th Post |
Gert
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Eric wrote:
Now I am curious, if the subject is static and you have a tripod, why not simply go for base iso and a long shutter time? Are you up against some very low frequency vibrations?
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