Sunday, January 17, 2010

K-x noise trial

I made these high-ISO tests for a friend who's considering upgrading to a newer Pentax DSLR, like the K-x. And then I thought they might be interesting to others. Even if you don't consider a Pentax, they will be similar to other contemporary DSLRs with a reduced sensor (which is pretty much all of them under $2000). Albeit the K-x, surprisingly considering size and price, is near the top end, according to reviewers.

I chose subject with shadow areas, since these tend to show noise more. And low depth-of-field for the same reason.

Note that I have turned off the noise reduction the camera does by default, since I've found that computer software does a better job (not surprising, given the demands of the tast). I have used Nik's Define, but others are good too.
If you leave the in-camera NR on, you'll probably get a quality which is in between what I show here before and after.

You have to click on them to see the differences.
Something which may not be clear in the resolution Blogger allows is that high-ISO downsides are not only about noise, but also less sharpness/detail. And noise-reduction, while it makes for smoother pictures, tends to make this worse.

ISO 1600, no noise-reduction:

ISO 1600, with noise-reduction:

ISO 1600, no noise-reduction:

ISO 1600, with noise-reduction:

ISO 1600, no noise-reduction:

ISO 1600, with noise-reduction:

ISO 3200, no noise-reduction:

ISO 3200, with noise-reduction:

ISO 3200, no noise-reduction:

ISO 3200, with noise-reduction:

ISO 3200, no noise-reduction:

ISO 3200, with noise-reduction:

ISO 6400, no noise-reduction:

ISO 6400, with noise-reduction:

ISO 6400, no noise-reduction:

ISO 6400, with noise-reduction:

ISO 6400, no noise-reduction:

ISO 6400, with noise-reduction:

I have put the link to the 28MB zip file of the full sized pictures in Comments.)

----
If you want comparison to other cameras, I recommend DPreview.com and imaging-resource.com for that. Also just googling around.
And 1001 has just posted links to a couple of similar tests.

posted by Eolake Stobblehouse @ Sunday, January 17, 2010   3 comments links to this post

3 Comments:

At 17 Jan 2010 13:37:00, Blogger eolake said...

You can download the full files here.

 
At 21 Apr 2011 06:09:00, Blogger Gunnasekkhaar said...

U did a good job. I am also a k-x owner and your review is really helpful. It seems its better to turn off the noise reduction in the camera and do it on the PC.

 
At 21 Apr 2011 15:34:00, Blogger eolake said...

Thanks, Gunnasekkhaar.

 

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