A few days ago, I posted some graphs that indicated that using live view on the D810 had no material effect on dark-field noise at 1/2000 second shutter speeds. Yesterday, I repeated the tests at 1/30 second and 1 second shutter speeds, with similar results. I’ve received a request to do more testing at really long shutter speeds…. [Read More]
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Learning on the job
No Battle Plan Survives Contact With the Enemy Thus spoke German military strategist Helmuth von Moltk. He was apparently right about war. The obvious corollary certainly applies to photography. And thus it is with my infrared trees series. Let’s start with lenses. I started out with the LifePixel-modified Sony alpha 7, the Coastal Optical 60mm f/4,… [Read More]
Leica M240 read noise analysis
Today I turn the read noise analysis tools developed over the past couple of weeks to a new camera, the Leica M240. The M240 is one of those cameras that subtracts out the black point before it writes the raw file, so we won’t get a clear picture of the read noise from a dark-field… [Read More]
MTF simulation: under the covers
Yesterday I went back and looked at some of the simulation results, and grew suspicious that there were problems with the way the simulated camera was sampling the simulated target. As I dug deeper, I started to question some of my original assumptions, and started experimenting with changes. What I ended up with is close… [Read More]
Color photography without demosaicing in practice
Yesterday’s post trotted out an idea for producing moderate resolution files from high-resolution cameras without demosaicing, and speculated that such files might show higher quality and fewer artifacts than similar-sized filed down-res’d from demosaiced raw files. I looked around for a tool to perform an experiment. I didn’t have to look far. DCRAW has an… [Read More]
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