Archives for 2014

Over the past two weeks, I’ve done a series of read noise analyses on an exhausting, if not exhaustive, ground of cameras. I’ve done to build up a data base for correlating visible read noise phenomena with measurements. Today I’d like to start looking at read noise in photographs. Before I do this, I’d like… [Read More]

Here are the read noise vs one-dimensional low pass filter size curves for the whole-f-stop ISOs of the Nikon D4. Unfortunately, the D4 chops off the left side of the histogram for dark-field images in its in-camera raw processing: Here they are referred to the sensor: You can see that, up until about ISO 800,… [Read More]

Here are the images from the preceding post. As usual in this read noise analysis series, they have been scaled into the range [0,1],  have had a gamma curve of 2.2 applied , been res’d down to 640×480, and JPEG’d. ISO 160, no filtering: Note the commendable lack of hot pixels. I wonder if that’s… [Read More]

I took a quick look at the Hasselblad H2D-39 a few days ago; that’s the only CCD camera for which I’ve analyzed the read noise. The H2D-39 cuts off the left half of the read noise histogram when making dark-field images, so it’s not ideal for these tests. The Leica M9 does not. In fact,… [Read More]