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]
Search Results for: m240 green shadows
Traveling with the Leica M240, part 7
A case study When I was on Campobello Island, I was able to visit a “cottage” right next to FDR’s 34-room one. One of the remarkable things about the dining room was the picture window, and, of course, the view. Here’s an image made with the 18mm Super-Elmar, f/5.6 @ 1/180, ISO 200, exposed for… [Read More]
Leica M240 with a cc30M filter
I thought maybe I had a solution to the Leica M240 green shadows problem. I figured, if it is a result of the M240’s nonlinearity in dark tones, then I could put a filter on the lens so that the green channel didn’t outweigh the other two. If they all rolled off together, the darks… [Read More]
Leica M240 banding, part 3
I’m beginning to get a handle on what’s going on with the M240 shadow behavior vs camera ISO setting. Here’s a series like that in the preceding post, but one stop more exposure, placing the average of the image values at ISO 3200 about 7 stops below full scale. The light is falling on the… [Read More]
Leica M240 push-post images, shadows
Now let’s take a look at a shadow region of the bookcase images. ISO 3200: ISO 1600 with a one-stop push: ISO 800 with a two-stop push: ISO 400 with a three-stop push: ISO 200 with a four-stop push: My conclusions are pretty much the same as with the middle and high tone images, but… [Read More]