Mark Ransom

Mark Ransom

Lives in United States Minneapolis area, MN, United States
Joined on Feb 13, 2003
About me:

Pentax was kind enough to let me win a K-7 camera as a door prize. I try not to let that color my opinion of them; I've been a Pentax supporter long before that, but I'm not a fanboy.

Mark Ransom's recent activity

  • There aren't any green shots. Each of the 4 shots takes all 3 colors, just from a different position. The reason they need 4 shots is because only 1/4 of the pixels are red and 1/4 are blue. ...
  • For this kind of shift to occur, there would have to be a large number of people unhappy with the status quo. I just don't see it. The Bayer filter is a compromise, but it's a very good one that ...
  • I have to agree, it looks a bit overdone. How about this one? Processed in Paint Shop Pro, I used Curves to bring up the shadows then Clarify to add back the lost contrast.
  • Replied in Example
    I suppose it's possible to look at it that way. Exposure is determined by the interrelation of 3 things - ISO, shutter speed, and F-stop. But since Pentax chooses not to multiply the shutter speed ...
  • Yes, it increases spatial resolution. A Bayer filtered image uses interpolation to fill in the holes in each color plane, resulting in less resolution than the pixel dimensions imply. By skipping ...
  • You're not combining the pictures the way you would if you were stacking them, you're intertwining the pixels from all 4 independently. It's like you're getting a picture at the same ISO but 4 ...
  • Question: how do you get the buffer raw data without reading it from the SD card?
  • The K-3 histogram almost looks like it was clipped on the left - but if it was, I'd expect to see a large spike at or near zero, and there isn't one.
  • If that's what's in the file, then what do you suggest doing?  Compressing the range enough to put them on the same scale would lose the detail that explains the point.  I find it interesting that ...
  • You can post here too, either directly in a post or in a gallery (which you can then copy to the post).  I prefer keeping the images on this site since you know they'll be permanent as long as the ...
  • Please do!  Enjoy the new camera.
  • Ron, the mountains in the background really increase the drama of this image. But since they're much more muted, they don't detract from the focus. Very well done.
  • What you say is true, with a big but... The rest of the system must be well beyond the capabilities of the weak link before you stop seeing improvements. If your lens and sensor are about equal in ...
  • No, gaps will be evenly distributed if the response is linear. If it only takes 1023 photons for a reading of 16383, what reading should 1022 photons generate?
  • Replied in Filters
    ND filters are a very specialist item. Usually you can adjust the exposure via ISO or aperture or shutter speed to get the same effect. The only time I've ever needed one is for long shots of ...
  • I generally don't bother, but I have Paint Shop Pro which is fully scriptable, making it easy.
  • Replied in Filters
    There are two schools of thought regarding filters: (1) I paid a lot for my lens, I'm going to protect it with a filter. (2) I paid a ...
  • Interesting work, thanks. Do the gaps increase as the ISO increases? Reportedly there's some noise reduction applied to the RAW files at high ISO, maybe that has something to do with it as well.
  • Ron, those are both excellent shots but I like the second one better.  My own cats don't know how good they have it!
  • Replied in Some crops
    Thanks again Barry! The picture really doesn't contain a lot of fine detail, making it hard to find clear-cut differences. However I did find a few. Here you can see the difference in the grass, ...
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Photos uploaded 176
Last upload Jul 12, 2011