A photographer on a board that I read gave some anecdotal comparisons of the Nikon D4 and M240 as low light cameras. That prompted me to try to do some analytical comparisons of my own. It didn’t turn out to be all that simple. Stay with me and see. I thought to compare signal to… [Read More]
Archives for September 2013
Details of the modeling of the Leica M240
There have been a few requests for an explanation of the noise floor simulation in the previous post. Here it is. The program uses a model of a digital camera that’s illustrated below in one-pixel form: Light falls on the back-biased photodiode causing electrons to be released. The electrons charge the capacitor. The buffer amp… [Read More]
Modeling the Leica M240 noise floor
I’ve noted before in this series of posts that the M240 has an unusually low noise floor at ISOs 200, 400, and 800, with ISOs 1600 and 3200 producing more reasonable values. Today I tried to do some modeling to figure out what was going on. Here’s the program (in Matlab), with the values entered… [Read More]
Leica M240 green shadows, images from two cameras
Now I’d like to quantify the effects of the blue/green shifts in the shadows that sometimes occur upon pushing M240 images. I’ll be comparing two sets of images, one that I created, and one sent to me by friend whose name I won’t mention, since he values his privacy more than the adoration of a grateful… [Read More]
Leica M240 color shifts with ISO, images
This is going to be a really boring post for most of you. I’m posting the images from which I derived the measurements in the preceding post. I expect they will only be useful to people who wish to verify my measurements, or create measurements of some of the other patches. All images are in… [Read More]
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