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 Post subject: New D7000 Problems?
PostPosted: Thu Apr 28, 2011 10:57 pm 
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Joined: Wed Jan 02, 2008 4:29 pm
Posts: 44
Location: N Ireland
Hi Guys

As per the title I have bought a new D7000 today and have taken what I thought was one of my best pics ever. When I looked at it on my computer there is a wave like in the shape of a semi circle through it. :? What caused this does anyone know?

Image

Taken with a 18-200mm Nikon VR lens. ISO 100, F8 at 206secs. I also used a Hoya ND400 to give me the longer shudder speed.

Here is a link to Flickr to see it larger.

http://www.flickr.com/photos/pjos111/

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Nikon D7000. Nikon AF-S DX 18-200mm f/3.5-5.6 G ED VR II Lens, Nikon 50mm 1.8D, Tamron 10mm-24mm


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 Post subject:
PostPosted: Fri Apr 29, 2011 2:56 am 
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Joined: Thu Jan 26, 2006 10:41 pm
Posts: 363
Hmmm

What in the sky is reflected in the water more darkly, making me think that it is real (to some extent).

Without seeing image information in detail I can only think that any defect may be limited to "stepping" in the JPEG, but it may only be emphasising what is already there.

The higher the ISO the more likelihood in picking artifacts.

Other than this, I'm stumped. My D7000 has behaved commendably.

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Nikon DSLRs, film cameras from Leica to Linhof


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 Post subject:
PostPosted: Fri Apr 29, 2011 5:33 pm 
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Joined: Thu Jun 05, 2008 12:19 pm
Posts: 67
Location: Maribor, Slovenia
I agree, it looks like jpeg color stepping to me too. What quality did you shoot at?


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 Post subject:
PostPosted: Fri Apr 29, 2011 5:58 pm 
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Joined: Wed Jan 02, 2008 4:29 pm
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Location: N Ireland
I shot this in Jpeg Fine ( large ) What is color stepping? :?

Paul


Just to add. I enabled Long exposure NR reduction.

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Nikon D7000. Nikon AF-S DX 18-200mm f/3.5-5.6 G ED VR II Lens, Nikon 50mm 1.8D, Tamron 10mm-24mm


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 Post subject:
PostPosted: Sat Apr 30, 2011 10:53 pm 
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Joined: Thu Jun 05, 2008 12:19 pm
Posts: 67
Location: Maribor, Slovenia
Color stepping occurs because jpeg images use only 8bits (i think, correct me if im wrong) per pixel for tonal value. Meaning you only get 256 different tones for a color. While this is not an issue under most conditions, it starts to show under challenging lighting conditions. Such as very dark scenes. Yours is a very good example.

Try shooting in raw (lossless compressed 14bit) 14bit would translate to 16384 tonal values.

I hope that made sense. And i hope im not wrong :)


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 Post subject:
PostPosted: Sat Apr 30, 2011 11:04 pm 
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Joined: Sun Feb 15, 2009 12:59 pm
Posts: 6009
Location: The Netherlands
Close:

8 bits per color channel, 3 channels per image. RAW has more bits, which means more data, and should mean better quality, mostly noticable in color gradients, highlight detail, some shadow detail/SNR, and perhaps some added sharpness due to a better bayer interpolating algorithm. :)

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