This blog is created by a class-3 nerd for sharing thoughts with other class-3 nerds or lower life forms. So this blog is intended to distribute information and insight that can help others: you won’t find direct information about what I am up to.

If a posting can be expressed more clearly or new info becomes available, the posted text may be updated. Comments are thus welcome and may be used as suggestions for improving the original posting.

8 Responses to About

  1. Sam says:

    Dear Peter,

    I have read your article on luminous-landscape.com partly. What I’ve noticed here and in all the reviews in the internet.
    That in the world of cameras, for you and all the other, only sharpness, noise and dynamic range is important.
    What many people overlook is the dynamic range and differentiate of colors.
    Today, there is the most benefit from great sensors.
    From each camera there should be also measured the color space and the differentiate of colors. And saved it in the ICC format.
    I have worked for 15 years as an fine art print. It has trained my eye.
    That’s just one small criticism. But when you forget about the Color you are not act like a Professional. You forget that we do not shoot in black and white, but in color.


    • pvdhamer says:


      From each camera there should be also measured the color space and the differentiate of colors. And saved it in the ICC format.

      The ability to differentiate colors is called “Color sensitivity” in the article (see Figure 8). The full DxOMark measurements include much more detailed measurements of how the camera handles color. This includes the color gamut which the sensor can handle, the metamerism index, and the spectral behavior of the color filters. I do not cover these in detail because these are complicated topics and off-topic in an article that is essentially about noise. Yes, color profiles are important (not just for screen and printer) but are largely a matter of using software correctly. And for most photographers partly a matter of taste. See also my Colormunki reviews written back in 2009.


    • Mohammed says:

      Thanks very much Simon. This was very important to me to see these crops, as I like you faield to understand why there was so little positive discussion about the ability to crop for birding. I predominantly shoot small garden birds here in the UK (Tits, Nuthatch, Robin etc) and I own a 500mm with a D700 currently and find that I simply am not able to get close enough to obtain a decent sized and in focus image. What you have shown above is that the cropping ability of such a high resolution camera, along with excellent glass and technique, should yield many more opportunities to obtain pictures of a suitable size and quality. Well done. I’m so looking forward to receiving my D800 in a couple of weeks hopefully.

  2. Royi says:

    Do you have a Google+ profile?
    It would be great if you shared your info with the Google+ Photography community.

    Great articles you have here, Thanks!

  3. Jock Elliott says:


    I have read your article on interpreting DXOMark numbers a couple of types, trying to get my head around it. I have written about science, tech, and medicine for 40 years from a laymen’s point of view.

    Anyhow, I have a very specific question to ask: I am working on a project involving photographs of the sky, mainly the daytime sky. I have taken a number of photographers with small sensor cameras (Canon G12, Panasonic FZ150, Olympus D550). Now I would like to get a nice wide starfield shot showing trees, etc. The cameras I am currently using have DXO low light ISO ratings around 150.

    The question: how high in low light ISO rating would I have to go to get a significant improvement in low light performance that would aid in taking star photographs without having to do motorized tracking to prevent streaking of the star images?

    Roughly speaking, I can get ISO 650 for a few hundred dollars, ISO 1,200 for $1,000-$2,000, and ISO above 2,000 for $2,000-$3,000.

    • pvdhamer says:

      not sure I can help much. I know cameras but not astrophotography.
      For what it’s worth:
      * differences in ISO rating should be judged by dividing two numbers. So each successive factor 2 improvement will have comparable improvement, but at an increasing cost.
      * consider trying out (borrow, rent) a camera before investing a lot
      * check what other who do this use
      * if you buy a camera for this, check if you will like the camera for general use as well
      * you are looking for high ISO so I assume you are taking twilight or night rather than “mostly daytime”.
      * is resolution important?

  4. sdonsby says:

    Hi Peter,
    Thx for all the valuable info genrously provided here 🙂
    And terefore: I really miss your article(s) on the HP B9180’s inkconsumption that seems to be gone now?
    Is it perhaps me doing something wrong?
    Looking forward to hearing from you

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